Comparison of H sup minus and D sup minus production in a magnetically filtered multicusp source
Conference
·
OSTI ID:5467100
- Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan)
A JAERI negative ion source was tested at LBL as part of the US-Japan Fusion Cooperation Program. By varying the strength of magnetic filter from 450 to 930 Gauss-cm, we compared production, transport, and extraction of the negative ions. The maximum current densities, which obtained at the corresponding optimum filter strength for each gas species, were 10.4 mA/cm{sup 2} for H{sup {minus}} and 8.4 mA/cm{sup 2} for D{sup {minus}} at arc discharges of 40 kW. The ratio of the ion current densities (J{sub D}{minus}/J{sub H}{minus}) is about 0.8, which is higher than 1/{radical}2. The electron to negative ion ration was 13 for hydrogen and 38 for deuterium at the corresponding optimum filter strength. The higher ratio in deuterium is probably due to higher space potential of deuterium plasma by a few volts. 9 refs., 7 figs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5467100
- Report Number(s):
- LBL-27743; CONF-890703--22; ON: DE90002450
- Country of Publication:
- United States
- Language:
- English
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