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1.
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Beam Energy Scaling of Ion-Induced Electron Yield from K+ Ions Impact on Stainless Steel Surfaces
/ Kireeff-Covo, Michel ; Baca, David ; Barnard, John J ; Bieniosek, Frank ; Celata, C M ; Cohen, Ronald ; Friedman, Alex ; Grote, D P ; Kwan, Joe W ; Lund, Steven M et al.
The cost of accelerators for heavy-ion inertial fusion energy (HIF) can be reduced by using the smallest possible clearance between the beam and the wall from the beamline. This increases beam loss to the walls, generating ion-induced electrons that could be trapped by beam space charge potential into an "electron cloud," which can cause degradation or loss of the ion beam [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2287
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2.
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Electron and Gas Effects on Intense, Space-Charge Dominated Ion Beams in Magnetic Quadrupoles : Comparison of Experiments and Simulations
/ Seidl, Peter ; Baca, David ; Bieniosek, Frank ; Cohen, Ronald ; Covo, Michel K ; Friedman, Alex ; Grote, D P ; Lund, Steven M ; Molvik, Arthur ; Vay, Jean-Luc
Accelerators for inertial fusion energy, high-energy density physics and other high intensity applications have an economic incentive to minimize the clearance between the beam edge and the aperture wall. This increases the risk from electron clouds and gas desorbed from walls [...]
2005
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.e-proc. FPAP015
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3.
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Initial Results on Neutralized Drift Compression Experiments (NDCX-IA) for High Intensity Ion Beam
/ Roy, Prabir K ; Anders, Andre ; Baca, David ; Bieniosek, Frank ; Coleman, Joshua E ; Davidson, Ronald C ; Efthimion, Philip ; Eylon, Shmuel ; Gilson, Erik P ; Grant Logan, B et al.
Ion beam neutralization and compression experiments are designed to determine the feasibility of using compressed high intensity ion beams for high energy density physics (HEDP) experiments and for inertial fusion power. To quantitatively ascertain the various mechanisms and methods for beam compression, the Neutralized Drift Compression Experiment (NDCX) facility is being constructed at Lawrence Berkeley National Laboratory (LBNL). [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3856
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4.
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Experiments Studying Desorbed Gas and Electron Clouds in Ion Accelerators
/ Molvik, Arthur ; Baca, David ; Barnard, John J ; Bieniosek, Frank ; Celata, C M ; Cohen, Ronald ; Covo, Michel K ; Friedman, Alex ; Lund, Steven M ; Seidl, Peter et al.
Electron clouds and gas pressure rise limit the performance of many major accelerator rings. We are studying these issues experimentally with ~1 MeV heavy-ion beams, coordinated with significant efforts in self-consistent simulation and theory.* The experiments use multiple diagnostics, within and between quadrupole magnets, to measure the sources and accumulation of electrons and gas. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.194
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5.
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Enhancements for the 1 MW High Voltage Converter Modulator Systems at the SNS
/ Anderson, David E ; Baca, David ; Hicks, Jim ; Hurst, Donald ; Peplov, Vladimir V ; Reass, William ; Tapp, Eddie ; Wezensky, Mark
The first-generation high frequency switching megawatt-class high voltage converter modulators (HVCM) developed by Los Alamos National Laboratory for the Spallation Neutron Source at Oak Ridge National Laboratory have been installed and are now operational. Each unit is capable of delivering pulses up to 11 MW peak, 1 MW average power at voltages up to 140 kV to drive klystron(s) rated up to 5 MW. [...]
2005
External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3313
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6.
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High power operation of the polyphase resonant converter modulator system for the spallation neutron source linear accelerator
/ Reass, W A ; Apgar, S E ; Baca, D M ; Doss, J D ; Gonzáles, J M ; Gribble, R F ; Trujillo, P G
The spallation neutron source (SNS) is a new 1.4 MW average power beam, 1 GeV accelerator being built at Oak Ridge national laboratory. The accelerator requires 15 "long-pulse" converter-modulator stations each providing a maximum of 11 MW pulses with a 1.1 MW average power. [...]
2003
In : 2003 IEEE Pulsed Power Conference, Dallas, TX, USA, 15 - 18 Jun 2003, pp.645-648 (v.1)
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7.
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Gas desorption and electron emission from 1 MeV potassium ion bombardment of stainless steel
/ Molvik, Arthur W (Lawrence Livermore National Laboratory, Livermore) ; Covo, Michel Kireeff (LBNL Berkeley) ; Bieniosek, Frank M (LBNL Berkeley) ; Prost, Lionel (LBNL Berkeley) ; Seidl, P (LBNL Berkeley) ; Baca, David (LBNL Berkeley) ; Coorey, Adam (LBNL Berkeley) ; Sakumi, Akira (CERN)
Gas desorption and electron emission coefficients were measured for 1 MeV potassium ions incident on stainless steel at grazing angles (between 80° and 88° from normal incidence) using a new gas-electron source diagnostic (GESD). Issues addressed in design and commissioning of the GESD include effects from backscattering of ions at the surface, space-charge limited emission current, and reproducibility of desorption measurements. [...]
2004
- Published in : Phys. Rev. Spec. Top. Accel. Beams 7 (2004) 093202
APS Published version, local copy: PDF;
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8.
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9.
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Design, Status, and First Operations of the Spallation Neutron Source Polyphase Resonant Converter Modulator System
/ Reass, W A ; Apgar, S E ; Baca, D ; Borovina, D L ; Bradley, J ; Doss, J D ; Gonzáles, J M ; Gribble, R F ; Hardek, T ; Lynch, M T et al.
2003 - 5 p.
External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.553
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10.
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The High Current Transport Experiment for Heavy Ion Inertial Fusion
/ Seidl, P A ; Baca, D ; Bieniosek, F M ; Celata, C M ; Faltens, A ; Prost, L R ; Sabbi, G L ; Waldron, W L ; Cohen, R ; Friedman, A et al.
2003 - 5 p.
External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.536
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