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Charge neutralization of small ion beam clumps

Abstract

The mega-ampere currents associated with light ion fusion (LIF) require excellent charge neutralization to prevent divergence growth. As the size and space-charge potential of a beam clump or `beamlet` become small (submillimeter size and kilovolt potentials), the neutralization becomes increasingly difficult. Linear theory predicts that plasma electrons cannot neutralize potentials < {phi}{sub crit} = (1/2)m{sub e}v{sub i}{sup 2}/e, where m{sub e} is the electron mass and v{sub i} is the ion beam velocity. A non-uniform beam would, therefore, have regions with potentials sufficient to add divergence to beam clumps. The neutralization of small beamlets produced on the SABLE accelerator and in numerical simulation has supported the theory, showing a plateau in divergence growths as the potential in the beamlet exceeds {phi}{sub crit}. (author). 1 tab., 2 figs., 4 refs.
Authors:
Welch, D R; [1]  Olson, C L; Hanson, D L [2] 
  1. Mission Research Corp., Albuquerque, NM (United States)
  2. Sandia National Labs., Albuquerque, NM (United States)
Publication Date:
Dec 31, 1996
Product Type:
Conference
Report Number:
INIS-CZ-0003; CONF-960610-
Reference Number:
SCA: 700411; PA: AIX-28:056126; EDB-97:114612; SN: 97001835105
Resource Relation:
Conference: BEAMS `96: 11. international conference on high-power particle beams, Prague (Czech Republic), 10-14 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of Beams `96. Proceedings of the 11th international conference on high power particle beams. Vol. II; Jungwirth, K.; Ullschmied, J. [eds.]; PB: [692] p.
Subject:
70 PLASMA PHYSICS AND FUSION; BEAM NEUTRALIZATION; COMPUTERIZED SIMULATION; ION BEAMS; ARGON; BEAM TRANSPORT; COULOMB IONIZATION; ELECTRIC POTENTIAL; I CODES; ION COLLISIONS; MEDIUM VACUUM; MEGA AMP BEAM CURRENTS; PLASMA SHEATH; PROTON BEAMS; SPACE CHARGE
OSTI ID:
511318
Research Organizations:
Ceskoslovenska Akademie Ved, Prague (Czech Republic). Ustav Fyziky Plazmatu
Country of Origin:
Czech Republic
Language:
English
Other Identifying Numbers:
Other: ON: DE97637209; TRN: CZ9726916056126
Availability:
INIS; OSTI as DE97637209
Submitting Site:
INIS
Size:
pp. 1115-1118
Announcement Date:

Citation Formats

Welch, D R, Olson, C L, and Hanson, D L. Charge neutralization of small ion beam clumps. Czech Republic: N. p., 1996. Web.
Welch, D R, Olson, C L, & Hanson, D L. Charge neutralization of small ion beam clumps. Czech Republic.
Welch, D R, Olson, C L, and Hanson, D L. 1996. "Charge neutralization of small ion beam clumps." Czech Republic.
@misc{etde_511318,
title = {Charge neutralization of small ion beam clumps}
author = {Welch, D R, Olson, C L, and Hanson, D L}
abstractNote = {The mega-ampere currents associated with light ion fusion (LIF) require excellent charge neutralization to prevent divergence growth. As the size and space-charge potential of a beam clump or `beamlet` become small (submillimeter size and kilovolt potentials), the neutralization becomes increasingly difficult. Linear theory predicts that plasma electrons cannot neutralize potentials < {phi}{sub crit} = (1/2)m{sub e}v{sub i}{sup 2}/e, where m{sub e} is the electron mass and v{sub i} is the ion beam velocity. A non-uniform beam would, therefore, have regions with potentials sufficient to add divergence to beam clumps. The neutralization of small beamlets produced on the SABLE accelerator and in numerical simulation has supported the theory, showing a plateau in divergence growths as the potential in the beamlet exceeds {phi}{sub crit}. (author). 1 tab., 2 figs., 4 refs.}
place = {Czech Republic}
year = {1996}
month = {Dec}
}