Modeling Electron-Cloud Effects in Heavy-Ion Accelerators [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2004.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: PDF-file: 8 pages; size: 0.1 Mbytes
Additional Creators:: Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Stray electrons can arise in positive-ion accelerators for heavy ion fusion or other applications as a result of ionization of ambient gas or gas released from walls due to halo-ion impact, or as a result of secondary- electron emission. We summarize results from several studies undertaken in conjunction with an effort to develop a self-consistent modeling capability: (1) Calculation of the electron cloud produced by electron desorption from computed beam-ion loss, which illustrates the importance of retaining ion reflection at the walls; (2) Simulation of the effect of specified electron cloud distributions on ion beam dynamics; and (3) analysis of an instability associated with a resonance between the beam-envelope ''breathing'' mode and the electron perturbation. We also report first results from a long-timestep algorithm for electron dynamics, which holds promise for efficient simultaneous solution of electron and ion dynamics. One conclusion from study (2) is that heavy-ion beams are surprisingly robust to electron clouds, compared to a priori expectations.

Report Numbers:

E 1.99:ucrl-proc-206744
ucrl-proc-206744

Subject(s):

Plasma Physics And Fusion

Other Subject(s):

Note:

Published through SciTech Connect.
09/21/2004.
"ucrl-proc-206744"
Presented at: 2004 Electron Cloud Workshop, Napa, CA, United States, Apr 21 - Apr 24, 2004.
Friedman, A; Cohen, R H; Lee, E P; Molvik, A W; Stoltz, P; Veitzer, S; Lund, S M; Azevedo, T; Vay, J.

Funding Information:

W-7405-ENG-48

View MARC record | catkey: 14739370