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Title: Influence of a biased beam dump on H sup minus beam neutralization measurements with a four-grid energy analyzer

Abstract

A four-grid energy analyzer diagnostic has been developed for the study of H{sup {minus}} beam space-charge compensation, and first measurements have been reported previously. Biased beam-dump measurements were undertaken to clarify the origin of electron currents measured in the FGA because they far exceeded predictions based on H{sup {minus}}-beam ionization and stripping processes. This experiment partially explains the anomalously large radial electron current. The FGA observations for negative beam-dump bias suggest electron ionization of the background gas is an additional mechanism for producing positive ions.

Authors:
; ;  [1]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (US)
Publication Date:
OSTI Identifier:
7159868
Report Number(s):
CONF-890703-
Journal ID: ISSN 0034-6748; CODEN: RSINA; TRN: 90-012274
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Journal Name:
Review of Scientific Instruments; (USA)
Additional Journal Information:
Journal Volume: 61:1; Conference: International conference on ion sources, Berkeley, CA (USA), 10-14 Jul 1989; Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ION SOURCES; BEAM CURRENTS; NEUTRAL BEAM SOURCES; BEAM ANALYZERS; BEAM DUMPS; BEAM TRANSPORT; BEAM-PLASMA SYSTEMS; HYDROGEN IONS; LASL; PLASMA DENSITY; SPACE CHARGE; CHARGED PARTICLES; CURRENTS; IONS; NATIONAL ORGANIZATIONS; US AEC; US DOE; US ERDA; US ORGANIZATIONS; 700205* - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems; 700102 - Fusion Energy- Plasma Research- Diagnostics

Citation Formats

Sherman, J, Pitcher, E, and Allison, P. Influence of a biased beam dump on H sup minus beam neutralization measurements with a four-grid energy analyzer. United States: N. p., 1990. Web.
Sherman, J, Pitcher, E, & Allison, P. Influence of a biased beam dump on H sup minus beam neutralization measurements with a four-grid energy analyzer. United States.
Sherman, J, Pitcher, E, and Allison, P. 1990. "Influence of a biased beam dump on H sup minus beam neutralization measurements with a four-grid energy analyzer". United States.
@article{osti_7159868,
title = {Influence of a biased beam dump on H sup minus beam neutralization measurements with a four-grid energy analyzer},
author = {Sherman, J and Pitcher, E and Allison, P},
abstractNote = {A four-grid energy analyzer diagnostic has been developed for the study of H{sup {minus}} beam space-charge compensation, and first measurements have been reported previously. Biased beam-dump measurements were undertaken to clarify the origin of electron currents measured in the FGA because they far exceeded predictions based on H{sup {minus}}-beam ionization and stripping processes. This experiment partially explains the anomalously large radial electron current. The FGA observations for negative beam-dump bias suggest electron ionization of the background gas is an additional mechanism for producing positive ions.},
doi = {},
url = {https://www.osti.gov/biblio/7159868}, journal = {Review of Scientific Instruments; (USA)},
issn = {0034-6748},
number = ,
volume = 61:1,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}

Conference:
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