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- Y. Tang
ATK-MR, Albuquerque, New Mexico
- K.C.D. Chan, C. Ekdahl
LANL, Los Alamos, New Mexico
- T.P. Hughes
Voss Scientific, Albuquerque, New Mexico
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The DARHT-2 (Dual-Axis Radiographic Hydrodynamics Test) facility is expected to produce a 2-kA, 20-MeV, 2-microsecond flattop electron beam pulse. Normal operation requires that the beam exit the accelerator with a normalized transverse emittance of less than 0.15-cm-rad. The beam break up (BBU) instability is a potentially serious effect for a high current linear accelerator. It arises from the interaction between the beam and the cavity modes of the accelerating cells. In support of the beam stability experiments, simulations of BBU for DARHT-2 using the Lamda code have been carried out. The simulations used experimental data for the transverse impedance of the cells. Lamda was benchmarked against results calculated with the LLNL code BREAKUP. For nominal transport parameters, simulation results showed that the BBU growth was not significant in changing the beam spot. For a magnetic field reduced by a factor of 5, BBU growth was over a factor of 100, and the image displacement effect was significant.
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- C. Ekdahl, E.O. Abeyta, P.A. Aragon, R. Archuleta, R. Bartsch, K.C.D. Chan, D. Dalmas, S. Eversole, R.J. Gallegos, J. Harrison, E. Jacquez, J. Johnson, B.T. McCuistian, N. Montoya, S. Nath, D. Oro, L.J. Rowton, M. Sanchez, R.D. Scarpetti, M. Schauer
LANL, Los Alamos, New Mexico
- H. Bender, W. Broste, C. Carlson, D. Frayer, D. Johnson, A. Tipton, C.-Y. Tom
Bechtel Nevada, Los Alamos, New Mexico
- R.J. Briggs
SAIC, Alamo, California
- T.P. Hughes, C. Mostrom, Y. Tang
ATK-MR, Albuquerque, New Mexico
- M.E. Schulze
GA, San Diego, California
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