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Production of negative hydrogen ions in a large multicusp ion source with double-magnetic filter configuration

Technical Report:

Abstract

The production of the negative hydrogen ions in a large multicusp ion source has been investigated in a double-magnetic filter (DMF) configuration. In the DMF configuration, the energetic electrons are trapped by the mirror of a magnetic multicusp field, and only the thermal electrons are present in the center of the arc chamber. A large amount of H{sup -} ions of more than 1 x 10{sup 12} cm{sup -3} are produced in the center region. The electron current extracted with the H{sup -} ions can be suppressed by a magnetic filter field in front of a plasma grid without affecting the H{sup -} ion current. The experimental data obtained in the DMF configuration are compared with those obtained in a single-magnetic filter (SMF) configuration. In the SMF configuration, the energetic electrons are present in the center region, and the magnetic filter in front of a plasma grid reduces the electron density and temperature, which results in the reduction of H{sup -} ion current as well as the electron current. The extracted electron current and the optimum gas pressure for the H{sup -} ion current are lower in the DMF configuration that those in the SMF configuration. (author).
Publication Date:
May 01, 1992
Product Type:
Technical Report
Report Number:
NIFS-149
Reference Number:
SCA: 700411; PA: JPN-92:011121; SN: 93000918526
Resource Relation:
Other Information: PBD: May 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ION SOURCES; HYDROGEN IONS 1 MINUS; ATOMIC BEAM SOURCES; NEUTRAL ATOM BEAM INJECTION; MAGNETIC FIELDS; MAGNETIC FILTERS; CUSPED GEOMETRIES; ELECTRON DENSITY; ELECTRON TEMPERATURE; BEAM EXTRACTION; PLASMA PRODUCTION; 700411; INERTIAL CONFINEMENT DEVICES
OSTI ID:
10111169
Research Organizations:
National Inst. for Fusion Science, Nagoya (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE93753200; TRN: JP9211121
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
42 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ando, A, Takeiri, Y, Kaneko, O, Oka, Y, Wada, M, and Kuroda, T. Production of negative hydrogen ions in a large multicusp ion source with double-magnetic filter configuration. Japan: N. p., 1992. Web.
Ando, A, Takeiri, Y, Kaneko, O, Oka, Y, Wada, M, & Kuroda, T. Production of negative hydrogen ions in a large multicusp ion source with double-magnetic filter configuration. Japan.
Ando, A, Takeiri, Y, Kaneko, O, Oka, Y, Wada, M, and Kuroda, T. 1992. "Production of negative hydrogen ions in a large multicusp ion source with double-magnetic filter configuration." Japan.
@misc{etde_10111169,
title = {Production of negative hydrogen ions in a large multicusp ion source with double-magnetic filter configuration}
author = {Ando, A, Takeiri, Y, Kaneko, O, Oka, Y, Wada, M, and Kuroda, T}
abstractNote = {The production of the negative hydrogen ions in a large multicusp ion source has been investigated in a double-magnetic filter (DMF) configuration. In the DMF configuration, the energetic electrons are trapped by the mirror of a magnetic multicusp field, and only the thermal electrons are present in the center of the arc chamber. A large amount of H{sup -} ions of more than 1 x 10{sup 12} cm{sup -3} are produced in the center region. The electron current extracted with the H{sup -} ions can be suppressed by a magnetic filter field in front of a plasma grid without affecting the H{sup -} ion current. The experimental data obtained in the DMF configuration are compared with those obtained in a single-magnetic filter (SMF) configuration. In the SMF configuration, the energetic electrons are present in the center region, and the magnetic filter in front of a plasma grid reduces the electron density and temperature, which results in the reduction of H{sup -} ion current as well as the electron current. The extracted electron current and the optimum gas pressure for the H{sup -} ion current are lower in the DMF configuration that those in the SMF configuration. (author).}
place = {Japan}
year = {1992}
month = {May}
}