Development of an intense negative hydrogen ion source with an external magnetic filter
Journal Article
·
· Review of Scientific Instruments
- National Institute for Fusion Science, Nagoya 464-01 (Japan)
- Hitachi Research Laboratory, Hitachi Ltd., Hitachi 316 (Japan)
- Kokubu Works, Hitachi Ltd., Hitachi 316 (Japan)
An intense negative hydrogen ion source has been developed, which has a strong external magnetic filter field in the wide area of 35 cm{times}62 cm produced by a pair of permanent magnet rows located at 35.4 cm separation. The filter strength is 70 G in the center and the line-integrated filter strength is 850 G cm, which keeps the low electron temperature in the extraction region. Strong cusp magnetic field, 1.8 kG on the chamber surface, is generated for improvement of the plasma confinement. These resulted in the high arc efficiency at the low operational gas pressure. 16.2 A of H{sup {minus}} ion current with the energy of 47 keV was obtained at the arc efficiency of 0.1 A/kW at the gas pressure of 3.8 mTorr in the cesium-mode operation. The magnetic field in the extraction gap is also strong, 450 G, for the electron suppression. The ratio of the extraction current to the negative ion current was less than 2.2 at the gas pressure of 3 mTorr. The two-stage acceleration was tested, and 13.6 A of H{sup {minus}} ion beam was accelerated to 125 keV. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- OSTI ID:
- 165061
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 3 Vol. 66; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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