http://www.rssboard.org/rss-specification 720 https://escholarship.org/uc/lbnl_lab_alsu/rss Recent eScholarship items from ALS-U Fri, 15 May 2026 08:54:09 +0000 https://escholarship.org/uc/item/13w0r6dm The neutralized drift compression experiment was designed and commissioned as a pulsed, linear induction accelerator to drive thin targets to warm dense matter (WDM) states with peak temperatures of ∼1 eV using intense, short pulses (∼1 ns) of 1.2 MeV lithium ions. At that kinetic energy, heating a thin target foil near the Bragg peak energy using He(+) ions leads to more uniform energy deposition of the target material than Li(+) ions. Experiments show that a higher current density of helium ions can be delivered from a plasma source compared to Li(+) ions from a hot plate type ion source. He(+) beam pulses as high as 200 mA at the peak and 4 μs long were measured from a multi-aperture 7-cm-diameter emission area. Within ±5% variation, the uniform beam area is approximately 6 cm across. The accelerated and compressed pulsed ion beams can be used for materials studies and isochoric heating of target materials for high energy density physics experiments and WDM studies. https://escholarship.org/uc/item/13w0r6dm Tue, 5 Nov 2024 00:00:00 +0000 Ji, Q Seidl, PA Waldron, WL Takakuwa, JH Friedman, A Grote, DP Persaud, A https://orcid.org/0000-0003-3186-8358 Barnard, JJ Schenkel, T https://orcid.org/0000-0003-4046-9252 https://escholarship.org/uc/item/77z091r3 Motivated by the need to harness the properties of renewable and biodegradable polymers for the design and manufacturing of multi-scale structures with complex geometries, we have employed our additive manufacturing platform that leverages molecular self-assembly for the production of metre-scale structures characterized by complex geometries and heterogeneous material composition. As a precursor material, we used chitosan, a chemically modified form of chitin, an abundant and sustainable structural polysaccharide. We demonstrate the ability to control concentration-dependent crystallization as well as the induction of the preferred orientation of the polymer chains through the combination of extrusion-based robotic fabrication and directional toolpathing. Anisotropy is demonstrated and assessed through high-resolution micro-X-ray diffraction in conjunction with finite element simulations. Using this approach, we can leverage controlled and user-defined small-scale propagation... https://escholarship.org/uc/item/77z091r3 Thu, 11 Jul 2024 00:00:00 +0000 Mogas-Soldevila, Laia Duro-Royo, Jorge Lizardo, Daniel Hollyer, George G Settens, Charles M Cox, Jordan M Overvelde, Johannes TB DiMasi, Elaine Bertoldi, Katia Weaver, James C Oxman, Neri https://escholarship.org/uc/item/5s84c2mz Global scientific exchange has been profoundly perturbed by the COVID-19 pandemic, altering user travel behaviours and accelerating the use of remote access. Combined with the advent of artificial intelligence (AI), these trends together can change how large-scale user scientific facilities are used by the community and managed by operators. https://escholarship.org/uc/item/5s84c2mz Wed, 24 Apr 2024 00:00:00 +0000 Argyriou, Dimitri https://escholarship.org/uc/item/9zm4v4bj Lattices for low-emittance light sources https://escholarship.org/uc/item/9zm4v4bj Tue, 27 Feb 2024 00:00:00 +0000 Steier, C https://orcid.org/0000-0002-4542-9324 https://escholarship.org/uc/item/6204c742 The ALS-U is the upgrade of the existing Lawrence Berkeley National Laboratory Advanced Light Source to a diffraction-limited soft x-ray light source. Here we present the lattice correction studies and commissioning simulations demonstrating that the proposed machine design can be expected to deliver the intended performance when realistic errors and perturbations are fully accounted for. Critical to this demonstration are the high-fidelity, realistic simulations of the beam-based alignment process (both in turn-by-turn mode during early commissioning and with stored beam) that are now made possible by the Toolkit for Simulated Commissioning. In addition to presenting a statistical performance analysis based on a large number of lattice error realizations, we also study the range of further improvements that can be obtained by fine-tuning the correction chain to individual error seeds, mimicking the approach one would follow once the machine is built. https://escholarship.org/uc/item/6204c742 Thu, 29 Jun 2023 00:00:00 +0000 Hellert, Thorsten Steier, Christoph https://orcid.org/0000-0002-4542-9324 Venturini, Marco https://escholarship.org/uc/item/4hd2q3js The ALS-U upgrade promises to deliver diffraction limited performance throughout the soft x-ray range by lowering the horizontal emittance to about 50 pm resulting in 2-3 orders of brightness increase for soft x-rays compared to the current ALS. The design utilizes a multi bend achromat lattice with on-axis swap-out injection and an accumulator ring. One central design goal is to install and commission ALS-U within a short dark period. This paper summarizes the status of the conceptual design of the accelerator, as well as some results of the R&D program that has been ongoing for the last 3 years. https://escholarship.org/uc/item/4hd2q3js Mon, 27 Mar 2023 00:00:00 +0000 Steier, C https://orcid.org/0000-0002-4542-9324 Allézy, A Anders, A https://orcid.org/0000-0002-5313-6505 Baptiste, K https://orcid.org/0000-0001-6824-3023 Byrd, J Chow, K Cutler, G https://orcid.org/0000-0003-2570-3952 Donahue, R Duarte, R Jung, JY Leemann, S https://orcid.org/0000-0001-6035-4634 Leitner, M https://orcid.org/0000-0001-8281-1584 Luo, T https://orcid.org/0000-0001-7358-9686 Nishimura, H Oliver, T Omolayo, O Osborn, J Pappas, C Persichelli, S Placidi, M Portmann, G Reyes, S Robin, D Sannibale, F https://orcid.org/0000-0003-0531-9304 de Santis, S Sun, C Swenson, C Venturini, M Waldron, W Wallén, E Wan, W https://escholarship.org/uc/item/2mk960ks The Advanced Light Source Upgrade (ALS-U) is a 4th generation diffraction-limited soft x-ray radiation source, consisting of a new accumulator ring (AR) and a new storage ring (SR). In both rings coupling-impedance driven instabilities need careful evaluation to ensure meeting the machine’s high-performance goals. This paper presents the workflow followed in building the impedance models and the beam-stability analysis based on those models. We follow the commonly accepted approach of separating the resistive-wall and the geometric parts of the impedance; the former is obtained by analytical formulas, the latter by numerical electro-magnetic codes (primarily CST Studio software) with perfectly-conducting boundary conditions. Impedance budgets are established and pseudo-Green functions calculated to be used in beam dynamics studies. We also present various ways to cross-check simulation results for reliable impedance modeling. Finally, the crucial single-bunch instability current... https://escholarship.org/uc/item/2mk960ks Tue, 19 Jul 2022 00:00:00 +0000 Wang, Dan Bane, Karl Li, Derun Luo, Tianhuan Omolayo, Olusola Penn, Gregory De Santis, Stefano Steier, Christoph https://orcid.org/0000-0002-4542-9324 Venturini, Marco https://escholarship.org/uc/item/9n12b8zs The Advanced Light Source Upgrade will implement on axis single-train swap-out injection employing an accumulator between the booster and storage rings. The accumulator ring (AR) design is a twelve period triple-bend achromat that will be installed along the inner circumference of the storage-ring tunnel. A nonconventional injection scheme will be utilized for top-off off axis injection from the booster into the AR meant to accommodate a large ∼300 nm emittance beam into a vacuum-chamber with a limiting horizontal aperture radius as small as 8 mm. The scheme incorporates three dipole kickers distributed over three sectors, with two kickers perturbing the stored beam and the third affecting both the stored and the injected beam trajectories. This paper describes this “3DK” injection scheme and how it fits the AR’s particular requirements. We describe the design and optimization process, and how we evaluated its fitness as a solution for booster-to-accumulator ring injection. https://escholarship.org/uc/item/9n12b8zs Tue, 18 Jan 2022 00:00:00 +0000 Ehrlichman, M Hellert, T Leemann, SC https://orcid.org/0000-0001-6035-4634 Penn, G Steier, C https://orcid.org/0000-0002-4542-9324 Sun, C Venturini, M Wang, D https://escholarship.org/uc/item/4nz5c1zd The ALS-U light source will implement on-axis single-train swap-out injection employing an accumulator between the booster and storage rings. The accumulator ring design is a twelve period triple-bend achromat that will be installed along the inner circumference of the storage-ring tunnel. A non-conventional injection scheme will be utilized for top-off off-axis injection from the booster into the accumulator ring meant to accommodate a large $\sim 300$~nm emittance beam into a vacuum-chamber with a limiting horizontal aperture radius as small as $8$ mm. The scheme incorporates three dipole kickers distributed over three sectors, with two kickers perturbing the stored beam and the third affecting both the stored and the injected beam trajectories. This paper describes this ``3DK'' injection scheme and how it fits the accumulator ring's particular requirements. We describe the design and optimization process, and how we evaluated its fitness as a solution for booster-to-accumulator... https://escholarship.org/uc/item/4nz5c1zd Thu, 8 Jul 2021 00:00:00 +0000 Ehrlichman, M Hellert, T Leemann, SC https://orcid.org/0000-0001-6035-4634 Penn, G Steier, C https://orcid.org/0000-0002-4542-9324 Sun, C Venturini, M Wang, D https://escholarship.org/uc/item/230856m0 The dual-phase xenon time projection chamber (TPC) is a powerful tool for direct-detection experiments searching for WIMP dark matter, other dark matter models, and neutrinoless double-beta decay. Successful operation of such a TPC is critically dependent on the ability to hold high electric fields in the bulk liquid, across the liquid surface, and in the gas. Careful design and construction of the electrodes used to establish these fields is therefore required. We present the design and production of the LUX-ZEPLIN (LZ) experiment's high-voltage electrodes, a set of four woven mesh wire grids. Grid design drivers are discussed, with emphasis placed on design of the electron extraction region. We follow this with a description of the grid production process and a discussion of steps taken to validate the LZ grids prior to integration into the TPC. https://escholarship.org/uc/item/230856m0 Tue, 22 Jun 2021 00:00:00 +0000 Linehan, R Mannino, RL Fan, A Ignarra, CM Luitz, S Skarpaas, K Shutt, TA Akerib, DS Alsum, SK Anderson, TJ Araújo, HM Arthurs, M Auyeung, H Bailey, AJ Biesiadzinski, TP Breidenbach, M Cherwinka, JJ Conley, RA Genovesi, J Gilchriese, MGD Glaenzer, A Gonda, TG Hanzel, K Hoff, MD Ji, W Kaboth, AC Kravitz, S https://orcid.org/0000-0003-2403-9105 Kurita, NR Lambert, AR Lesko, KT https://orcid.org/0000-0002-0149-5231 Lorenzon, W Majewski, PA Miller, EH Monzani, ME Palladino, KJ Ratcliff, BN Saba, JS Santone, D Shutt, GW Stifter, K Szydagis, M Tomás, A Va'vra, J Waldron, WL Webb, RC White, RG Whitis, TJ Wilson, K Wisniewski, WJ https://escholarship.org/uc/item/7996m5c3 The concept of using a single nonlinear kicker (NLK) to inject electron beams into a storage ring has been proposed and tested in several synchrotron radiation light source facilities. Different from pulsed dipole kicker magnets used in a conventional local-bump injection, the single nonlinear kicker provides a nonlinear distribution of magnetic fields which has a maximum value off axis where the injected beam arrives and a zero or near-zero value at the center where the stored beam passes by. Therefore, the injected beam will receive a kick from the NLK and lose its transverse momentum, and will be eventually captured by the storage ring. In the meantime the stored beam at the center will receive no kick or less kick, which significantly reduces the injection perturbations on the stored beam. In addition, the NLK injection requires less space for the kicker and removes the complications of synchronizing four pulsed kicker magnets. Because of these advantages, several light source... https://escholarship.org/uc/item/7996m5c3 Wed, 13 Jan 2021 00:00:00 +0000 Sun, C Amstutz, Ph Hellert, T Leemann, SC https://orcid.org/0000-0001-6035-4634 Steier, C https://orcid.org/0000-0002-4542-9324 Swenson, C Venturini, M https://escholarship.org/uc/item/93d9p6tm LUX-ZEPLIN (LZ) is a second-generation direct dark matter experiment with spin-independent WIMP-nucleon scattering sensitivity above 1.4×10-48cm2$${1.4 \times 10^{-48}}\, {\hbox {cm}}^{2}$$ for a WIMP mass of 40GeV/c2$${40}\, \hbox {GeV}/{\hbox {c}}^{2}$$ and a 1000days$${1000}\, \hbox {days}$$ exposure. LZ achieves this sensitivity through a combination of a large 5.6t$${5.6}\, \hbox {t}$$ fiducial volume, active inner and outer veto systems, and radio-pure construction using materials with inherently low radioactivity content. The LZ collaboration performed an extensive radioassay campaign over a period of six years to inform material selection for construction and provide an input to the experimental background model against which any possible signal excess may be evaluated. The campaign and its results are described in this paper. We present assays of dust and radon daughters depositing on the surface of components as well as cleanliness controls necessary to maintain background... https://escholarship.org/uc/item/93d9p6tm Tue, 24 Nov 2020 00:00:00 +0000 Akerib, DS Akerlof, CW Akimov, D Yu Alquahtani, A Alsum, SK Anderson, TJ https://orcid.org/0000-0002-7113-6840 Angelides, N Araújo, HM Arbuckle, A Armstrong, JE Arthurs, M Auyeung, H Aviles, S Bai, X Bailey, AJ Balajthy, J Balashov, S Bang, J Barry, MJ Bauer, D Bauer, P Baxter, A Belle, J Beltrame, P Bensinger, J Benson, T Bernard, EP Bernstein, A Bhatti, A Biekert, A Biesiadzinski, TP Birch, HJ Birrittella, B Boast, KE Bolozdynya, AI Boulton, EM Boxer, B Bramante, R Branson, S Brás, P Breidenbach, M Brew, CAJ Buckley, JH Bugaev, VV Bunker, R Burdin, S Busenitz, JK Cabrita, R Campbell, JS Carels, C Carlsmith, DL Carlson, B Carmona-Benitez, MC Cascella, M Chan, C Cherwinka, JJ Chiller, AA Chiller, C Chott, NI Cole, A Coleman, J Colling, D Conley, RA Cottle, A Coughlen, R Cox, G Craddock, WW Curran, D Currie, A Cutter, JE da Cunha, JP Dahl, CE Dardin, S Dasu, S Davis, J Davison, TJR de Viveiros, L Decheine, N Dobi, A Dobson, JEY Druszkiewicz, E Dushkin, A Edberg, TK Edwards, WR Edwards, BN Edwards, J Elnimr, MM Emmet, WT Eriksen, SR Faham, CH Fan, A Fayer, S Fiorucci, S Flaecher, H Florang, IM Fogarty Ford, P Francis, VB Fraser, ED Froborg, F Fruth, T https://escholarship.org/uc/item/252876nt As noble liquid time projection chambers grow in size their high voltage requirements increase, and detailed, reproducible studies of dielectric breakdown and the onset of electroluminescence are needed to inform their design. The Xenon Breakdown Apparatus (XeBrA) is a 5-liter cryogenic chamber built to characterize the DC high voltage breakdown behavior of liquid xenon and liquid argon. Electrodes with areas up to 33 cm2 were tested while varying the cathode-anode separation from 1 to 6 mm with a voltage difference up to 75 kV. A power-law relationship between breakdown field and electrode area was observed. The breakdown behavior of liquid argon and liquid xenon within the same experimental apparatus was comparable. https://escholarship.org/uc/item/252876nt Wed, 22 Apr 2020 00:00:00 +0000 Tvrznikova, L Bernard, EP Kravitz, S https://orcid.org/0000-0003-2403-9105 O'Sullivan, K Richardson, G Riffard, Q https://orcid.org/0000-0002-4478-1107 Waldron, WL Watson, J McKinsey, DN https://escholarship.org/uc/item/0x68b8p8 LUX-ZEPLIN (LZ) is a next-generation dark matter direct detection experiment that will operate 4850 feet underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA. Using a two-phase xenon detector with an active mass of 7 tonnes, LZ will search primarily for low-energy interactions with weakly interacting massive particles (WIMPs), which are hypothesized to make up the dark matter in our galactic halo. In this paper, the projected WIMP sensitivity of LZ is presented based on the latest background estimates and simulations of the detector. For a 1000 live day run using a 5.6-tonne fiducial mass, LZ is projected to exclude at 90% confidence level spin-independent WIMP-nucleon cross sections above 1.4×10-48 cm2 for a 40 GeV/c2 mass WIMP. Additionally, a 5σ discovery potential is projected, reaching cross sections below the exclusion limits of recent experiments. For spin-dependent WIMP-neutron(-proton) scattering, a sensitivity of 2.3×10-43 cm2 (7.1×10-42... https://escholarship.org/uc/item/0x68b8p8 Tue, 4 Feb 2020 00:00:00 +0000 Akerib, DS Akerlof, CW Alsum, SK Araújo, HM Arthurs, M Bai, X Bailey, AJ Balajthy, J Balashov, S Bauer, D Belle, J Beltrame, P Benson, T Bernard, EP Biesiadzinski, TP Boast, KE Boxer, B Brás, P Buckley, JH Bugaev, VV Burdin, S Busenitz, JK Carels, C Carlsmith, DL Carlson, B Carmona-Benitez, MC Chan, C Cherwinka, JJ Cole, A Cottle, A Craddock, WW Currie, A Cutter, JE Dahl, CE de Viveiros, L Dobi, A Dobson, JEY Druszkiewicz, E Edberg, TK Edwards, WR Fan, A Fayer, S Fiorucci, S Fruth, T Gaitskell, RJ Genovesi, J Ghag, C Gilchriese, MGD van der Grinten, MGD Hall, CR Hans, S Hanzel, K Haselschwardt, SJ Hertel, SA Hillbrand, S Hjemfelt, C Hoff, MD Hor, JY-K Huang, DQ Ignarra, CM Ji, W Kaboth, AC Kamdin, K Keefner, J Khaitan, D Khazov, A Kim, YD Kocher, CD Korolkova, EV Kraus, H Krebs, HJ Kreczko, L Krikler, B Kudryavtsev, VA Kyre, S Lee, J Lenardo, BG Leonard, DS Lesko, KT https://orcid.org/0000-0002-0149-5231 Levy, C Li, J Liao, J Liao, F-T Lin, J https://orcid.org/0000-0002-9970-8150 Lindote, A Linehan, R Lippincott, WH Liu, X Lopes, MI Paredes, B López Lorenzon, W Luitz, S Lyle, JM Majewski, P Manalaysay, A Mannino, RL Maupin, C McKinsey, DN Meng, Y Miller, EH https://escholarship.org/uc/item/4vs237b9 We present a new accelerator toolbox (AT)-based toolkit for simulating the commissioning of light-source storage rings. The toolkit provides a framework for supporting high-level scripts to represent with realism the various procedures (e.g., orbit and optics correction, beam-based alignment, etc.) encountered during commissioning and is designed to mirror as closely as possible the reality as seen from the control room. Emphasis is placed on the inclusion of a comprehensive set of error sources and faithful modeling of beam diagnostics. The toolkit capabilities are demonstrated in an application to the recent design and commissioning studies of the Advanced Light Source Upgrade (ALS-U) Accumulator Ring, a short-time successful commissioning of which will be critical to the overall ALS-U project success. https://escholarship.org/uc/item/4vs237b9 Fri, 8 Nov 2019 00:00:00 +0000 Hellert, Thorsten Amstutz, Philipp Steier, Christoph https://orcid.org/0000-0002-4542-9324 Venturini, Marco https://escholarship.org/uc/item/5823k370 We describe the design and assembly of the LUX-ZEPLIN experiment, a direct detection search for cosmic WIMP dark matter particles. The centerpiece of the experiment is a large liquid xenon time projection chamber sensitive to low energy nuclear recoils. Rejection of backgrounds is enhanced by a Xe skin veto detector and by a liquid scintillator Outer Detector loaded with gadolinium for efficient neutron capture and tagging. LZ is located in the Davis Cavern at the 4850’ level of the Sanford Underground Research Facility in Lead, South Dakota, USA. We describe the major subsystems of the experiment and its key design features and requirements. https://escholarship.org/uc/item/5823k370 Wed, 30 Oct 2019 00:00:00 +0000 Akerib, DS Akerlof, CW Akimov, D Yu Alquahtani, A Alsum, SK Anderson, TJ https://orcid.org/0000-0002-7113-6840 Angelides, N Araújo, HM Arbuckle, A Armstrong, JE Arthurs, M Auyeung, H Bai, X Bailey, AJ Balajthy, J Balashov, S Bang, J Barry, MJ Barthel, J Bauer, D Bauer, P Baxter, A Belle, J Beltrame, P Bensinger, J Benson, T Bernard, EP Bernstein, A Bhatti, A Biekert, A Biesiadzinski, TP Birrittella, B Boast, KE Bolozdynya, AI Boulton, EM Boxer, B Bramante, R Branson, S Brás, P Breidenbach, M Buckley, JH Bugaev, VV Bunker, R Burdin, S Busenitz, JK Campbell, JS Carels, C Carlsmith, DL Carlson, B Carmona-Benitez, MC Cascella, M Chan, C Cherwinka, JJ Chiller, AA Chiller, C Chott, NI Cole, A Coleman, J Colling, D Conley, RA Cottle, A Coughlen, R Craddock, WW Curran, D Currie, A Cutter, JE da Cunha, JP Dahl, CE Dardin, S Dasu, S Davis, J Davison, TJR de Viveiros, L Decheine, N Dobi, A Dobson, JEY Druszkiewicz, E Dushkin, A Edberg, TK Edwards, WR Edwards, BN Edwards, J Elnimr, MM Emmet, WT Eriksen, SR Faham, CH Fan, A Fayer, S Fiorucci, S Flaecher, H Florang, IM Fogarty Ford, P Francis, VB Froborg, F Fruth, T Gaitskell, RJ Gantos, NJ Garcia, D Geffre, A Gehman, VM https://escholarship.org/uc/item/3t71d677 The Advanced Light Source (ALS) at Berkeley Lab remains one of the brightest sources for soft x-rays worldwide. A multiyear upgrade of the ALS is underway, which includes new and replacement x-ray beamlines, a replacement of many of the original insertion devices and many upgrades to the accelerator. The accelerator upgrade that affects the ALS performance most directly is the ALS brightness upgrade [1], which reduces the horizontal emittance from 6.3 to 2.0 nm (2.5 nm effective). Magnets for this upgrade were installed in late 2012 and early 2013 followed by user operation with the reduced emittance. https://escholarship.org/uc/item/3t71d677 Fri, 13 Sep 2019 00:00:00 +0000 Steier, C https://orcid.org/0000-0002-4542-9324 Madur, A Bailey, B Berg, K Biocca, A Black, A Casey, P Colomb, D Gunion, B Li, N Marks, S Nishimura, H Pappas, C Petermann, K Portmann, G Prestemon, S https://orcid.org/0000-0002-1937-4040 Rawlins, A Robin, D Rossi, S Scarvie, T Schlueter, R Sun, C Tarawneh, H Wan, W Williams, E Yin, L Zhou, Q Jin, J Zhang, J Chen, C Wen, Y Wu, J https://escholarship.org/uc/item/22w4q8sn High brightness, high repetition rate electron beams are key components for optimizing the performance of next generation scientific instruments, such as MHz-class X-ray Free Electron Laser (XFEL) and Ultra-fast Electron Diffraction/Microscopy (UED/UEM). In the Advanced Photo-injector EXperiment (APEX) at Berkeley Lab, a photoelectron gun based on a 185.7MHz normal conducting re-entrant RF cavity, has been proven to be a feasible solution to provide high brightness, high repetition rate electron beam for both XFEL and UED/UEM. Based on the success of APEX, a new electron gun system, named APEX2, has been under development to further improve the electron beam brightness. For APEX2, we have designed a new 162.5MHz two-cell photoelectron gun and achieved a significant increase on the cathode launching field and the beam exit energy. For a fixed charge per bunch, these improvements will allow for the emittance reduction and hence to an increased beam brightness. The design of APEX2... https://escholarship.org/uc/item/22w4q8sn Tue, 20 Aug 2019 00:00:00 +0000 Luo, T https://orcid.org/0000-0001-7358-9686 Feng, H Filippetto, D Johnson, M Lambert, A https://orcid.org/0009-0003-5658-2601 Li, D Mitchell, C https://orcid.org/0000-0002-1986-9852 Sannibale, F https://orcid.org/0000-0003-0531-9304 Staples, J Virostek, S Wells, R https://escholarship.org/uc/item/9n68w5v7 The scaling of reaction yields in light ion fusion to low reaction energies is important for our understanding of stellar fuel chains and the development of future energy technologies. Experiments become progressively more challenging at lower reaction energies due to the exponential drop of fusion cross sections below the Coulomb barrier. We report on experiments where deuterium-deuterium (D-D) fusion reactions are studied in a pulsed plasma in the glow discharge regime using a benchtop apparatus. We model plasma conditions using particle-in-cell codes. Advantages of this approach are relatively high peak ion currents and current densities (0.1 to several A/cm2) that can be applied to metal wire cathodes for several days. We detect neutrons from D-D reactions with scintillator-based detectors. For palladium targets, we find neutron yields as a function of cathode voltage that are over 100 times higher than yields expected for bare nuclei fusion at ion energies below 2 keV (center... https://escholarship.org/uc/item/9n68w5v7 Mon, 13 May 2019 00:00:00 +0000 Schenkel, T https://orcid.org/0000-0003-4046-9252 Persaud, A https://orcid.org/0000-0003-3186-8358 Wang, H Seidl, PA MacFadyen, R Nelson, C Waldron, WL Vay, J-L Deblonde, G https://orcid.org/0000-0002-0825-8714 Wen, B Chiang, Y-M MacLeod, BP Ji, Q https://escholarship.org/uc/item/84k7r6f3 A New Light for Berkeley Lab—the Advanced Light Source Upgrade https://escholarship.org/uc/item/84k7r6f3 Wed, 3 Apr 2019 00:00:00 +0000 White, Ashley Goldberg, Kenneth https://orcid.org/0000-0001-9984-5780 Kevan, Stephen https://orcid.org/0000-0002-4621-9142 Leitner, Daniela https://orcid.org/0000-0002-9736-2504 Robin, David Steier, Christoph https://orcid.org/0000-0002-4542-9324 Yarris, Lynn https://escholarship.org/uc/item/30v0j8kj Abstract In the Daya Bay Reactor Neutrino Experiment 960 20-cm-diameter waterproof photomultiplier tubes are used to instrument three water pools as Cherenkov detectors for detecting cosmic-ray muons. Of these 960 photomultiplier tubes, 341 are recycled from the MACRO experiment. A systematic program was undertaken to refurbish them as waterproof assemblies. In the context of passing the water leakage check, a success rate better than 97% was achieved. Details of the design, fabrication, testing, operation, and performance of these waterproofed photomultiplier-tube assemblies are presented. https://escholarship.org/uc/item/30v0j8kj Tue, 9 Oct 2018 00:00:00 +0000 Chow, Ken Cummings, John Edwards, Emily Edwards, William Ely, Ry Hoff, Matthew Lebanowski, Logan Li, Bo Li, Piyi Lin, Shih-Kai Liu, Dawei Liu, Jinchang Luk, Kam-Biu Miao, Jiayuan Napolitano, Jim Ochoa-Ricoux, Juan Pedro Peng, Jen-Chieh Qi, Ming Steiner, Herbert Stoler, Paul Stuart, Mary Wang, Lingyu Yang, Changgen Zhong, Weili https://escholarship.org/uc/item/0kc4r526 Recently, we presented a new approach for a compact radio-frequency (RF) accelerator structure and demonstrated the functionality of the individual components: acceleration units and focusing elements. In this paper, we combine these units to form a working accelerator structure: a matching section between the ion source extraction grids and the RF-acceleration unit and electrostatic focusing quadrupoles between successive acceleration units. The matching section consists of six electrostatic quadrupoles (ESQs) fabricated using 3D-printing techniques. The matching section enables us to capture more beam current and to match the beam envelope to conditions for stable transport in an acceleration lattice. We present data from an integrated accelerator consisting of the source, matching section, and an ESQ doublet sandwiched between two RF-acceleration units. https://escholarship.org/uc/item/0kc4r526 Thu, 28 Jun 2018 00:00:00 +0000 Seidl, PA Persaud, A https://orcid.org/0000-0003-3186-8358 Ghiorso, W Ji, Q Waldron, WL Lal, A Vinayakumar, KB Schenkel, T https://orcid.org/0000-0003-4046-9252 https://escholarship.org/uc/item/91m9t787 The international Muon Ionization Cooling Experiment (MICE) will perform a systematic investigation of ionization cooling with muon beams of momentum between 140 and 240 MeV/c at the Rutherford Appleton Laboratory ISIS facility. The measurement of ionization cooling in MICE relies on the selection of a pure sample of muons that traverse the experiment. To make this selection, the MICE Muon Beam is designed to deliver a beam of muons with less than ∼1% contamination. To make the final muon selection, MICE employs a particle-identification (PID) system upstream and downstream of the cooling cell. The PID system includes time-of-flight hodoscopes, threshold-Cherenkov counters and calorimetry. The upper limit for the pion contamination measured in this paper is fπ < 1.4% at 90% C.L., including systematic uncertainties. Therefore, the MICE Muon Beam is able to meet the stringent pion-contamination requirements of the study of ionization cooling. https://escholarship.org/uc/item/91m9t787 Tue, 12 Jun 2018 00:00:00 +0000 Adams, D Alekou, A Apollonio, M Asfandiyarov, R Barber, G Barclay, P de Bari, A Bayes, R Bayliss, V Bertoni, R Blackmore, VJ Blondel, A Blot, S Bogomilov, M Bonesini, M Booth, CN Bowring, D Boyd, S Brashaw, TW Bravar, U Bross, AD Capponi, M Carlisle, T Cecchet, G Charnley, C Chignoli, F Cline, D Cobb, JH Colling, G Collomb, N Coney, L Cooke, P Courthold, M Cremaldi, LM DeMello, A Dick, A Dobbs, A Dornan, P Drews, M Drielsma, F Filthaut, F Fitzpatrick, T Franchini, P Francis, V Fry, L Gallagher, A Gamet, R Gardener, R Gourlay, S Grant, A Greis, JR Griffiths, S Hanlet, P Hansen, OM Hanson, GG Hart, TL Hartnett, T Hayler, T Heidt, C Hills, M Hodgson, P Hunt, C Iaciofano, A Ishimoto, S Kafka, G Kaplan, DM Karadzhov, Y Kim, YK Kuno, Y Kyberd, P Lagrange, J-B Langlands, J Lau, W Leonova, M Li, D Lintern, A Littlefield, M Long, K Luo, T https://orcid.org/0000-0001-7358-9686 Macwaters, C Martlew, B Martyniak, J Mazza, R Middleton, S Moretti, A Moss, A Muir, A Mullacrane, I Nebrensky, JJ Neuffer, D Nichols, A Nicholson, R Nugent, JC Oates, A Onel, Y Orestano, D Overton, E Owens, P Palladino, V Pasternak, J https://escholarship.org/uc/item/1d2343xm We present an overview of the performance of the Neutralized Drift Compression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and summarize recent studies of material properties created with nanosecond and millimeter-scale ion beam pulses. The scientific topics being explored include the dynamics of ion induced damage in materials, materials synthesis far from equilibrium, warm dense matter and intense beam-plasma physics. We summarize the improved accelerator performance, diagnostics and results of beam-induced irradiation of thin samples of, e.g., tin and silicon. Bunches with over 3x10^10 ions, 1- mm radius, and 2-30 ns FWHM duration have been created. To achieve these short pulse durations and mm-scale focal spot radii, the 1.2 MeV He+ ion beam is neutralized in a drift compression section which removes the space charge defocusing effect during final compression and focusing. Quantitative comparison of detailed particle-in-cell simulations with the experiment play an... https://escholarship.org/uc/item/1d2343xm Tue, 5 Jun 2018 00:00:00 +0000 Seidl, PA Ji, Q Persaud, A https://orcid.org/0000-0003-3186-8358 Feinberg, E Ludewigt, B Silverman, M Sulyman, A Waldron, WL Schenkel, T https://orcid.org/0000-0003-4046-9252 Barnard, JJ Friedman, A Grote, DP Gilson, EP Kaganovich, ID Stepanov, A Treffert, F Zimmer, M https://escholarship.org/uc/item/2894q938 An endstation with two high-efficiency soft x-ray spectrographs was developed at Beamline 8.0.1 of the Advanced Light Source, Lawrence Berkeley National Laboratory. The endstation is capable of performing soft x-ray absorption spectroscopy, emission spectroscopy, and, in particular, resonant inelastic soft x-ray scattering (RIXS). Two slit-less variable line-spacing grating spectrographs are installed at different detection geometries. The endstation covers the photon energy range from 80 to 1500 eV. For studying transition-metal oxides, the large detection energy window allows a simultaneous collection of x-ray emission spectra with energies ranging from the O K-edge to the Ni L-edge without moving any mechanical components. The record-high efficiency enables the recording of comprehensive two-dimensional RIXS maps with good statistics within a short acquisition time. By virtue of the large energy window and high throughput of the spectrographs, partial fluorescence yield and... https://escholarship.org/uc/item/2894q938 Tue, 8 May 2018 00:00:00 +0000 Qiao, Ruimin Li, Qinghao Zhuo, Zengqing Sallis, Shawn Fuchs, Oliver Blum, Monika https://orcid.org/0000-0002-2918-9092 Weinhardt, Lothar Heske, Clemens Pepper, John Jones, Michael Brown, Adam Spucces, Adrian Chow, Ken Smith, Brian Glans, Per-Anders https://orcid.org/0000-0003-0625-0855 Chen, Yanxue Yan, Shishen Pan, Feng Piper, Louis FJ Denlinger, Jonathan https://orcid.org/0000-0001-7645-1631 Guo, Jinghua https://orcid.org/0000-0002-8576-2172 Hussain, Zahid https://orcid.org/0000-0002-6434-5134 Chuang, Yi-De https://orcid.org/0000-0002-2773-3840 Yang, Wanli https://orcid.org/0000-0003-0666-8063 https://escholarship.org/uc/item/5m22w19m K-Cs-Sb bialkali antimonide photocathodes grown by a triple-element codeposition method have been found to have excellent quantum efficiency (QE) and outstanding near-atomic surface smoothness and have been employed in the VHF gun in the Advanced Photoinjector Experiment (APEX), however, their robustness in terms of their lifetime at elevated photocathode temperature has not yet been investigated. In this paper, the relationship between the lifetime of the K-Cs-Sb photocathode and the photocathode temperature has been investigated. The origin of the significant QE degradation at photocathode temperatures over 70 °C has been identified as the loss of cesium atoms from the K-Cs-Sb photocathode, based on the in situ x-ray analysis on the photocathode film during the decay process. The findings from this work will not only further the understanding of the behavior of K-Cs-Sb photocathodes at elevated temperature and help develop more temperature-robust cathodes, but also will become... https://escholarship.org/uc/item/5m22w19m Thu, 8 Feb 2018 00:00:00 +0000 Ding, Zihao Karkare, Siddharth Feng, Jun Filippetto, Daniele Johnson, Matthew Virostek, Steve Sannibale, Fernando https://orcid.org/0000-0003-0531-9304 Nasiatka, James Gaowei, Mengjia Sinsheimer, John Muller, Erik Smedley, John Padmore, Howard https://orcid.org/0000-0003-0172-4871 https://escholarship.org/uc/item/9bd2b6b3 The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a detector containing a total of 10 tonnes of liquid xenon within a double-vessel cryostat. The large mass and proximity of the cryostat to the active detector volume demand the use of material with extremely low intrinsic radioactivity. We report on the radioassay campaign conducted to identify suitable metals, the determination of factors limiting radiopure production, and the selection of titanium for construction of the LZ cryostat and other detector components. This titanium has been measured with activities of 238Ue  < 1.6 mBq/kg, 238Ul  < 0.09 mBq/kg, 232The=0.28±0.03 mBq/kg, 232Thl=0.25±0.02 mBq/kg, 40K  < 0.54 mBq/kg, and 60Co  < 0.02 mBq/kg (68% CL). Such low intrinsic activities, which are some of the lowest ever reported for titanium, enable its use for future dark matter and other rare event searches. Monte Carlo simulations have... https://escholarship.org/uc/item/9bd2b6b3 Fri, 5 Jan 2018 00:00:00 +0000 Akerib, DS Akerlof, CW Akimov, D Yu Alsum, SK Araújo, HM Arnquist, IJ Arthurs, M Bai, X Bailey, AJ Balajthy, J Balashov, S Barry, MJ Belle, J Beltrame, P Benson, T Bernard, EP Bernstein, A Biesiadzinski, TP Boast, KE Bolozdynya, A Boxer, B Bramante, R Brás, P Buckley, JH Bugaev, VV Bunker, R Burdin, S Busenitz, JK Carels, C Carlsmith, DL Carlson, B Carmona-Benitez, MC Chan, C Cherwinka, JJ Chiller, AA Chiller, C Cottle, A Coughlen, R Craddock, WW Currie, A Dahl, CE Davison, TJR Dobi, A Dobson, JEY Druszkiewicz, E Edberg, TK Edwards, WR Emmet, WT Faham, CH Fiorucci, S Fruth, T Gaitskell, RJ Gantos, NJ Gehman, VM Gerhard, RM Ghag, C Gilchriese, MGD Gomber, B Hall, CR Hans, S Hanzel, K Haselschwardt, SJ Hertel, SA Hillbrand, S Hjemfelt, C Hoff, MD Holbrook, B Holtom, E Hoppe, EW Hor, JY-K Horn, M Huang, DQ Hurteau, TW Ignarra, CM Jacobsen, RG Ji, W Kaboth, A Kamdin, K Kazkaz, K Khaitan, D Khazov, A Khromov, AV Konovalov, AM Korolkova, EV Koyuncu, M Kraus, H Krebs, HJ Kudryavtsev, VA Kumpan, AV Kyre, S Lee, C Lee, HS Lee, J Leonard, DS Leonard, R Lesko, KT https://orcid.org/0000-0002-0149-5231 Levy, C Liao, F-T Lin, J https://orcid.org/0000-0002-9970-8150 Lindote, A https://escholarship.org/uc/item/50z5d0wb We have commenced experiments with intense short pulses of ion beams on the Neutralized Drift Compression Experiment (NDCX-II) at Lawrence Berkeley National Laboratory, with 1-mm beam spot size within 2.5 ns full-width at half maximum. The ion kinetic energy is 1.2 MeV. To enable the short pulse duration and mm-scale focal spot radius, the beam is neutralized in a 1.5-meter-long drift compression section following the last accelerator cell. A short-focal-length solenoid focuses the beam in the presence of the volumetric plasma that is near the target. In the accelerator, the line-charge density increases due to the velocity ramp imparted on the beam bunch. The scientific topics to be explored are warm dense matter, the dynamics of radiation damage in materials, and intense beam and beam-plasma physics including select topics of relevance to the development of heavy-ion drivers for inertial fusion energy. Below the transition to melting, the short beam pulses offer an opportunity... https://escholarship.org/uc/item/50z5d0wb Thu, 4 Jan 2018 00:00:00 +0000 Seidl, PA Barnard, JJ Davidson, RC Friedman, A Gilson, EP Grote, D Ji, Q Kaganovich, ID Persaud, A https://orcid.org/0000-0003-3186-8358 Waldron, WL Schenkel, T https://orcid.org/0000-0003-4046-9252 https://escholarship.org/uc/item/6jf1s9vx The past decade was characterized by an increasing scientific demand for extending towards higher repetition rates (MHz class and beyond) the performance of already operating lower repetition rate accelerator-based instruments such as x-ray free electron lasers (FELs) and ultrafast electron diffraction (UED) and microscopy (UEM) instruments. Such a need stimulated a worldwide spread of a vibrant R&D activity targeting the development of high-brightness electron sources capable of operating at these challenging rates. Among the different technologies pursued, rf guns based on room-temperature structures resonating in the very high frequency (VHF) range (30–300 MHz) and operating in continuous wave successfully demonstrated in the past few years the targeted brightness and reliability. Nevertheless, recently proposed upgrades for x-ray FELs and the always brightness-frontier applications such as UED and UEM are now requiring a further step forward in terms of beam brightness... https://escholarship.org/uc/item/6jf1s9vx Tue, 19 Dec 2017 00:00:00 +0000 Sannibale, F https://orcid.org/0000-0003-0531-9304 Filippetto, D Johnson, M Li, D Luo, T https://orcid.org/0000-0001-7358-9686 Mitchell, C https://orcid.org/0000-0002-1986-9852 Staples, J Virostek, S Wells, R Byrd, JM https://escholarship.org/uc/item/8vr0z67j A new approach for a compact radio-frequency (RF) accelerator structure is presented. The new accelerator architecture is based on the Multiple Electrostatic Quadrupole Array Linear Accelerator (MEQALAC) structure that was first developed in the 1980s. The MEQALAC utilized RF resonators producing the accelerating fields and providing for higher beam currents through parallel beamlets focused using arrays of electrostatic quadrupoles (ESQs). While the early work obtained ESQs with lateral dimensions on the order of a few centimeters, using a printed circuit board (PCB), we reduce the characteristic dimension to the millimeter regime, while massively scaling up the potential number of parallel beamlets. Using Microelectromechanical systems scalable fabrication approaches, we are working on further reducing the characteristic dimension to the sub-millimeter regime. The technology is based on RF-acceleration components and ESQs implemented in the PCB or silicon wafers where each beamlet... https://escholarship.org/uc/item/8vr0z67j Tue, 28 Nov 2017 00:00:00 +0000 Persaud, A https://orcid.org/0000-0003-3186-8358 Ji, Q Feinberg, E Seidl, PA Waldron, WL Schenkel, T https://orcid.org/0000-0003-4046-9252 Lal, A Vinayakumar, KB Ardanuc, S Hammer, DA https://escholarship.org/uc/item/0k96n5nn Abstract We present an overview of the performance of the Neutralized Drift Compression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and report on recent target experiments on beam-driven melting and transmission ion energy loss measurements with nanosecond and millimeter-scale ion beam pulses and thin tin foils. Bunches with around 10 11 ions, 1 mm radius, and 2–30 ns full width at half maximum duration have been created with corresponding fluences in the range of 0.1–0.7 J/cm 2 . To achieve these short pulse durations and mm-scale focal spot radii, the 1.1 MeV [megaelectronvolt (10 6 eV)] He + ion beam is neutralized in a drift compression section, which removes the space charge defocusing effect during final compression and focusing. The beam space charge and drift compression techniques resemble necessary beam conditions and manipulations in heavy ion inertial fusion accelerators. Quantitative comparison of detailed particle-in-cell simulations with the experiment... https://escholarship.org/uc/item/0k96n5nn Tue, 28 Nov 2017 00:00:00 +0000 Seidl, PA Barnard, JJ Feinberg, E Friedman, A Gilson, EP Grote, DP Ji, Q Kaganovich, ID Ludewigt, B Persaud, A https://orcid.org/0000-0003-3186-8358 Sierra, C Silverman, M Stepanov, AD Sulyman, A Treffert, F Waldron, WL Zimmer, M Schenkel, T https://orcid.org/0000-0003-4046-9252 https://escholarship.org/uc/item/72w7c0wp A novel single-particle technique to measure emittance has been developed and used to characterise seventeen different muon beams for the Muon Ionisation Cooling Experiment (MICE). The muon beams, whose mean momenta vary from 171 to 281 MeV/c, have emittances of approximately 1.2–2.3 π mm-rad horizontally and 0.6–1.0 π mm-rad vertically, a horizontal dispersion of 90–190 mm and momentum spreads of about 25 MeV/c. There is reasonable agreement between the measured parameters of the beams and the results of simulations. The beams are found to meet the requirements of MICE. https://escholarship.org/uc/item/72w7c0wp Thu, 19 Oct 2017 00:00:00 +0000 The MICE Collaboration Adams, D Adey, D Alekou, A Apollonio, M Asfandiyarov, R Back, J Barber, G Barclay, P de Bari, A Bayes, R Bayliss, V Bertoni, R Blackmore, VJ Blondel, A Blot, S Bogomilov, M Bonesini, M Booth, CN Bowring, D Boyd, S Bradshaw, TW Bravar, U Bross, AD Capponi, M Carlisle, T Cecchet, G Charnley, G Cobb, JH Colling, D Collomb, N Coney, L Cooke, P Courthold, M Cremaldi, LM DeMello, A Dick, AJ Dobbs, A Dornan, P Fayer, S Filthaut, F Fish, A Fitzpatrick, T Fletcher, R Forrest, D Francis, V Freemire, B Fry, L Gallagher, A Gamet, R Gourlay, S Grant, A Graulich, JS Griffiths, S Hanlet, P Hansen, OM Hanson, GG Harrison, P Hart, TL Hartnett, T Hayler, T Heidt, C Hills, M Hodgson, P Hunt, C Iaciofano, A Ishimoto, S Kafka, G Kaplan, DM Karadzhov, Y Kim, YK Kolev, D Kuno, Y Kyberd, P Lau, W Leaver, J Leonova, M Li, D Lintern, A Littlefield, M Long, K Lucchini, G Luo, T https://orcid.org/0000-0001-7358-9686 Macwaters, C Martlew, B Martyniak, J Middleton, S Moretti, A Moss, A Muir, A Mullacrane, I Nebrensky, JJ Neuffer, D Nichols, A Nicholson, R Nugent, JC Onel, Y Orestano, D Overton, E Owens, P https://escholarship.org/uc/item/6558v85s Multiple Electrostatic Quadrupole Array Linear Accelerators (MEQALACs) provide an opportunity to realize compact radio- frequency (RF) accelerator structures that can deliver very high beam currents. MEQALACs have been previously realized with acceleration gap distances and beam aperture sizes of the order of centimeters. Through advances in Micro-Electro-Mechanical Systems (MEMS) fabrication, MEQALACs can now be scaled down to the sub-millimeter regime and batch processed on wafer substrates. In this paper we show first results from using three RF stages in a compact MEMS-based ion accelerator. The results presented show proof-of-concept with accelerator structures formed from printed circuit boards using a 3 × 3 beamlet arrangement and noble gas ions at 10 keV. We present a simple model to describe the measured results. We also discuss some of the scaling behaviour of a compact MEQALAC. The MEMS-based approach enables a low-cost, highly versatile accelerator covering a wide... https://escholarship.org/uc/item/6558v85s Thu, 3 Aug 2017 00:00:00 +0000 Persaud, A https://orcid.org/0000-0003-3186-8358 Seidl, PA Ji, Q Feinberg, E Waldron, WL Schenkel, T https://orcid.org/0000-0003-4046-9252 Ardanuc, S Vinayakumar, KB Lal, A https://escholarship.org/uc/item/90s0s57w Laser pump-X-ray probe experiments require control over the X-ray pulse pattern and timing. Here, the first use of pseudo-single-bunch mode at the Advanced Light Source in picosecond time-resolved X-ray absorption experiments on solutions and solids is reported. In this mode the X-ray repetition rate is fully adjustable from single shot to 500 kHz, allowing it to be matched to typical laser excitation pulse rates. Suppressing undesired X-ray pulses considerably reduces detector noise and improves signal to noise in time-resolved experiments. In addition, dose-induced sample damage is considerably reduced, easing experimental setup and allowing the investigation of less robust samples. Single-shot X-ray exposures of a streak camera detector using a conventional non-gated charge-coupled device (CCD) camera are also demonstrated. https://escholarship.org/uc/item/90s0s57w Tue, 27 Jun 2017 00:00:00 +0000 Hertlein, MP Scholl, A Cordones, AA Lee, JH Engelhorn, K Glover, TE Barbrel, B Sun, C Steier, C https://orcid.org/0000-0002-4542-9324 Portmann, G Robin, DS https://escholarship.org/uc/item/40f4888d Pseudosingle-bunch kick-and-cancel (PSB-KAC) is a new operational mode at the Advanced Light Source of Lawrence Berkeley National Laboratory that provides full timing and repetition rate control for single x-ray pulse users while being fully transparent to other users of synchrotron radiation light. In this operational mode, a single electron bunch is periodically displaced from a main bunch train by a fast kicker magnet with a user-on-demand repetition rate, creating a single x-ray pulse to be matched to a typical laser excitation pulse rate. This operational mode can significantly improve the signal to noise ratio of single x-ray pulse experiments and drastically reduce dose-induced sample damage rate. It greatly expands the capabilities of synchrotron light sources to carry out dynamics and time-of-flight experiments. In this paper, we carry out extensive characterizations of this PSB-KAC mode both numerically and experimentally. This includes the working principle of this... https://escholarship.org/uc/item/40f4888d Tue, 27 Jun 2017 00:00:00 +0000 Sun, C Robin, DS Steier, C https://orcid.org/0000-0002-4542-9324 Portmann, G https://escholarship.org/uc/item/9n14v6vg We have commenced experiments with intense short pulses of ion beams on the Neutralized Drift Compression Experiment-II at Lawrence Berkeley National Laboratory, by generating beam spots size with radius r<1mm within 2ns FWHM and approximately 1010 ions/pulse. To enable the short pulse durations and mm-scale focal spot radii, the 1.2MeV Li+ ion beam is neutralized in a 1.6-meter drift compression section located after the last accelerator magnet. An 8-Tesla short focal length solenoid compresses the beam in the presence of the large volume plasma near the end of this section before the target. The scientific topics to be explored are warm dense matter, the dynamics of radiation damage in materials, and intense beam and beam-plasma physics including selected topics of relevance to the development of heavy-ion drivers for inertial fusion energy. Here we describe the accelerator commissioning and time-resolved ionoluminescence measurements of yttrium aluminum perovskite using... https://escholarship.org/uc/item/9n14v6vg Tue, 9 May 2017 00:00:00 +0000 Seidl, Peter A Persaud, Arun https://orcid.org/0000-0003-3186-8358 Waldron, William L Barnard, John J Davidson, Ronald C Friedman, Alex Gilson, Erik P Greenway, Wayne G Grote, David P Kaganovich, Igor D Lidia, Steven M Stettler, Matthew Takakuwa, Jeffrey H Schenkel, Thomas https://orcid.org/0000-0003-4046-9252 https://escholarship.org/uc/item/6595c1t3 The Daya Bay experiment was the first to report simultaneous measurements of reactor antineutrinos at multiple baselines leading to the discovery of ν¯e oscillations over km-baselines. Subsequent data has provided the world׳s most precise measurement of sin22θ13 and the effective mass splitting Δmee2. The experiment is located in Daya Bay, China where the cluster of six nuclear reactors is among the world׳s most prolific sources of electron antineutrinos. Multiple antineutrino detectors are deployed in three underground water pools at different distances from the reactor cores to search for deviations in the antineutrino rate and energy spectrum due to neutrino mixing. Instrumented with photomultiplier tubes, the water pools serve as shielding against natural radioactivity from the surrounding rock and provide efficient muon tagging. Arrays of resistive plate chambers over the top of each pool provide additional muon detection. The antineutrino detectors were specifically designed... https://escholarship.org/uc/item/6595c1t3 Mon, 29 Feb 2016 00:00:00 +0000 An, FP Bai, JZ Balantekin, AB Band, HR Beavis, D Beriguete, W Bishai, M Blyth, S Brown, RL Butorov, I Cao, D Cao, GF Cao, J Carr, R Cen, WR Chan, WT Chan, YL Chang, JF Chang, LC Chang, Y Chasman, C Chen, HY Chen, HS Chen, MJ Chen, QY Chen, SJ Chen, SM Chen, XC Chen, XH Chen, XS Chen, YX Chen, Y Cheng, JH Cheng, J Cheng, YP Cherwinka, JJ Chidzik, S Chow, K Chu, MC Cummings, JP de Arcos, J Deng, ZY Ding, XF Ding, YY Diwan, MV Dong, L Dove, J Draeger, E Du, XF Dwyer, DA Edwards, WR Ely, SR Fang, SD Fu, JY Fu, ZW Ge, LQ Ghazikhanian, V Gill, R Goett, J Gonchar, M Gong, GH Gong, H Gornushkin, YA Grassi, M Greenler, LS Gu, WQ Guan, MY Guo, RP Guo, XH Hackenburg, RW Hahn, RL Han, R Hans, S He, M He, Q He, WS Heeger, KM Heng, YK Higuera, A Hinrichs, P Ho, TH Hoff, M Hor, YK Hsiung, YB Hu, BZ Hu, LM Hu, LJ Hu, T Hu, W Huang, EC Huang, HZ https://orcid.org/0000-0002-6760-2394 Huang, HX Huang, PW Huang, X Huang, XT Huber, P Hussain, G Isvan, Z Jaffe, DE Jaffke, P