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Negative ion extraction characteristics of a large negative ion source with double-magnetic filter configuration

Technical Report:

Abstract

A multi-ampere hydrogen negative ion source with a large extraction area of 25 cm x 25 cm has been developed. This negative ion source is a volume-production-type bucket ion source which is operated with double-magnetic filter configuration. In this configuration, the fast electrons, which produce the vibrationally excited molecules, are trapped near the chamber wall by the cusp field, which is the first magnetic filter. In the central region of the arc chamber, these exist only the thermal electrons with low temperature. As a result, the negative ions are produced in the central region by dissociative attachment. A rod magnetic filter in front of the plasma grid, which is the second magnetic filter, is utilized for reducing the population of the electrons in the vicinity of the plasma grid, which are extracted together with the negative ions. By this structure the extracted electron current can be controlled independently of the H{sup -} ion current. So far, a 1.4A of H{sup -} ion current has been obtained with the energy of 34 keV. Negative ion extraction characteristics of this ion source, such as the arc power dependence and the gas pressure dependence, are presented. (author).
Publication Date:
May 01, 1992
Product Type:
Technical Report
Report Number:
NIFS-151
Reference Number:
SCA: 700411; PA: JPN-92:011123; SN: 93000918528
Resource Relation:
Other Information: PBD: May 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ION SOURCES; HYDROGEN IONS 1 MINUS; NEUTRAL ATOM BEAM INJECTION; ATOMIC BEAM SOURCES; MAGNETIC FILTERS; CUSPED GEOMETRIES; HYDROGEN 1 MINUS BEAMS; BEAM INJECTION HEATING; BEAM EXTRACTION; PLASMA PRODUCTION; ELECTRON TEMPERATURE; 700411; INERTIAL CONFINEMENT DEVICES
OSTI ID:
10111174
Research Organizations:
National Inst. for Fusion Science, Nagoya (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE93753202; TRN: JP9211123
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
33 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Takeiri, Y, Ando, A, Kaneko, O, Oka, Y, and Kuroda, T. Negative ion extraction characteristics of a large negative ion source with double-magnetic filter configuration. Japan: N. p., 1992. Web.
Takeiri, Y, Ando, A, Kaneko, O, Oka, Y, & Kuroda, T. Negative ion extraction characteristics of a large negative ion source with double-magnetic filter configuration. Japan.
Takeiri, Y, Ando, A, Kaneko, O, Oka, Y, and Kuroda, T. 1992. "Negative ion extraction characteristics of a large negative ion source with double-magnetic filter configuration." Japan.
@misc{etde_10111174,
title = {Negative ion extraction characteristics of a large negative ion source with double-magnetic filter configuration}
author = {Takeiri, Y, Ando, A, Kaneko, O, Oka, Y, and Kuroda, T}
abstractNote = {A multi-ampere hydrogen negative ion source with a large extraction area of 25 cm x 25 cm has been developed. This negative ion source is a volume-production-type bucket ion source which is operated with double-magnetic filter configuration. In this configuration, the fast electrons, which produce the vibrationally excited molecules, are trapped near the chamber wall by the cusp field, which is the first magnetic filter. In the central region of the arc chamber, these exist only the thermal electrons with low temperature. As a result, the negative ions are produced in the central region by dissociative attachment. A rod magnetic filter in front of the plasma grid, which is the second magnetic filter, is utilized for reducing the population of the electrons in the vicinity of the plasma grid, which are extracted together with the negative ions. By this structure the extracted electron current can be controlled independently of the H{sup -} ion current. So far, a 1.4A of H{sup -} ion current has been obtained with the energy of 34 keV. Negative ion extraction characteristics of this ion source, such as the arc power dependence and the gas pressure dependence, are presented. (author).}
place = {Japan}
year = {1992}
month = {May}
}