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Title |
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| TUXC01 |
Status of DARHT 2nd Axis Accelerator at the Los Alamos National Laboratory
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831 |
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- R. D. Scarpetti, J. Barraza, C. Ekdahl, E. Jacquez, S. Nath, K. Nielsen, G. J. Seitz
LANL, Los Alamos, New Mexico
- F. M. Bieniosek, B. G. Logan
LBNL, Berkeley, California
- G. J. Caporaso, Y.-J. Chen
LLNL, Livermore, California
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This presentation will provide a status report on the 2kA, 17MeV, 2-microsecond Dual-Axis Radiographic Hydrotest electron beam accelerator at Los Alamos National Laboratory, and will cover results from the cell refurbishment effort, commissioning experiments on beam transport and stability through the accelerator, and experiments exercising the beam chopper.
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Slides
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| TUYC02 |
High Gradient Induction Accelerator
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857 |
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- G. J. Caporaso, D. T. Blackfield, Y.-J. Chen, J. R. Harris, S. A. Hawkins, L. Holmes, S. D. Nelson, A. Paul, B. R. Poole, M. A. Rhodes, S. Sampayan, M. Sanders, S. Sullivan, L. Wang, J. A. Watson
LLNL, Livermore, California
- M. L. Krogh
University of Missouri - Rolla, Rolla, Missouri
- C. Nunnally
University of Missouri, Columbia, Columbia, Missouri
- K. Selenes
TPL, Albuquerque, NM
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Funding: This work was performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.
Progress in the development of compact induction accelerators employing advanced vacuum insulators and dielectrics will be described. These machines will have average accelerating gradients at least an order of magnitude higher than existing machines and can be used for a variety of applications including flash x-ray radiography and medical treatments. Research describing an extreme variant of this technology aimed at proton therapy for cancer will be described.
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Slides
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| TUPAS057 |
Injector Particle Simulation and Beam Transport in a Compact Linear Proton Accelerator
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1781 |
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- D. T. Blackfield, Y.-J. Chen, J. R. Harris, S. D. Nelson, A. Paul, B. R. Poole
LLNL, Livermore, California
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Funding: This work was performed under the auspices of the U. S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.
A compact Dielectric Wall Accelerator (DWA), with field gradient up to 100 MV/m, is being developed to accelerate proton bunches for use in cancer therapy treatment. The injector first generates a few nanosecond long and 40 pQ proton bunch, which is then compressed in the compression section at the end of the injector. Finally the bunch is accelerated in the high-gradient DWA accelerator to energy up to 70 - 250 MeV. The Particle-In-Cell (PIC) code LSP is used to model several aspects of this design. First, we use LSP to determine the needed voltage waveform in the A-K gap that will produce a proton bunch with the requisite charge. We then model pulse compression and shaping in the section between the A-K gap and the DWA. We finally use LSP to model the beam transport through the DWA.
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| TUPAS059 |
Compact Proton Accelerator for Cancer Therapy
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1787 |
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- Y.-J. Chen, A. Paul
LLNL, Livermore, California
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Funding: This work was performed under the auspices of the U. S. Department of Energy, the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.
An investigation is being made into the feasibility of making a compact proton accelerator for medical radiation treatment. The accelerator is based on high gradient insulation (HGI) technology. The beam energy should be tunable between 70 and 250 MeV to allow the Bragg peak to address tumors at different depths in the patient. The desired radiation dose is consistent with a beam charge of 40 pico-coulombs. The particle source is a small 2 mm plasma device from which a several nano-second pulse can be extracted. The beam current is selectable by the potential of the extraction electrode and is adjustable in the range of 10-100 milli-Amperes. This beam is then accelerated and focused by the next three electrodes forming a Accel-Deaccel-Accel (ADA) structure leading to the DWA accelerator block. The spot size is adjustable over 2 to 10 mm. A transparent grid terminates the injector section and prevents the very high gradient of the HGI structure from influencing the overall focusing of the system. The beam energy is determined by the length of the DWA structure that is charged. This give independent selection of beam dose, size and energy.
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| WEPMS014 |
Vacuum Insulator Studies for the Dielectric Wall Accelerator
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2358 |
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- J. R. Harris, D. T. Blackfield, G. J. Caporaso, Y.-J. Chen, M. Sanders
LLNL, Livermore, California
- M. L. Krogh
University of Missouri - Rolla, Rolla, Missouri
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Funding: This work was performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.
As part of our ongoing development of the Dielectric Wall Accelerator, we are studying the performance of multilayer high-gradient insulators. These vacuum insulating structures are composed of thin, alternating layers of metal and dielectric, and have been shown to withstand higher gradients than conventional vacuum insulator materials. This paper describes these structures and presents some of our recent results.
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| THOBAB02 |
Commissioning the DARHT-II Scaled Accelerator Downstream Transport
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2627 |
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- M. E. Schulze
SAIC, Los Alamos, New Mexico
- E. O. Abeyta, P. Aragon, R. Archuleta, J. Barraza, D. Dalmas, C. Ekdahl, K. Esquibel, S. Eversole, R. J. Gallegos, J. F. Harrison, E. Jacquez, J. Johnson, P. S. Marroquin, B. T. McCuistian, N. Montoya, S. Nath, L. J. Rowton, R. D. Scarpetti, M. Schauer
LANL, Los Alamos, New Mexico
- R. Anaya, G. J. Caporaso, F. W. Chambers, Y.-J. Chen, S. Falabella, G. Guethlein, J. F. McCarrick, B. A. Raymond, R. A. Richardson, J. A. Watson, J. T. Weir
LLNL, Livermore, California
- H. Bender, W. Broste, C. Carlson, D. Frayer, D. Johnson, A. Tipton, C.-Y. Tom
NSTec, Los Alamos, New Mexico
- T. C. Genoni, T. P. Hughes, C. H. Thoma
Voss Scientific, Albuquerque, New Mexico
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The DARHT-II accelerator will produce a 2-kA, 17-MeV beam in a 1600-ns pulse when completed this summer. After exiting the accelerator, the long pulse is sliced into four short pulses by a kicker and quadrupole septum and then transported for several meters to a tantalum target for conversion to bremsstrahlung for radiography. We describe tests of the kicker, septum, transport, and multi-pulse converter target using a short accelerator assembled from the first available refurbished cells, which are now capable of operating of operating at over 200 kV. This scaled accelerator was operated at ~ 8 Mev and ~1 kA, which provides a beam with approximately the same nu/gamma as the final 17-MeV, 2-kA beam, and therefore the same beam dynamics in the downstream transport. The results of beam measurements made during the commissioning of this scaled accelerator downstream transport are described.
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Slides
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