Title :
Effect of stimulated and thermal desorption in DARHT-2
Author :
Hughes, T.P. ; Davis, H.
Author_Institution :
Mission Res. Corp., Albuquerque, NM, USA
Abstract :
The DARHT-2 accelerator generates a 2 kA, 18 MeV, 2 μsec flat-top electron beam. The beam risetime is about 700 ns, and a "beam cleanup zone" (BCUZ) has been designed to scrape off these mismatched electrons. Experiments on DARHT-1 (which has a 60 ns flat-top) have provided excellent quantitative data on stimulated and thermal desorption of neutral monolayers on various metal surfaces by multi-MeV electrons. We have used these data in the particle-in-cell code UP to model the production of ions from the walls of the DARHT-2 BCUZ. The effect of these ions on the transport of the main beam pulse is discussed.
Keywords :
collective accelerators; electron accelerators; electron stimulated desorption; linear accelerators; particle beam diagnostics; thermally stimulated desorption; 18 MeV; 2 kA; 2 mus; 60 ns; DARHT-2; beam cleanup zone; beam risetime; flat-top electron beam; mismatched electrons; multi-MeV electrons; neutral monolayers; stimulated desorption; thermal desorption; Acceleration; Computational modeling; Electron accelerators; Electron beams; Ion accelerators; Particle accelerators; Particle beams; Power transmission lines; Solid modeling; Voltage;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1288856
