The effect of caesium and xenon addition on negative hydrogen ion production
- Department of Pure and Applied Physics, Queen`s University of Belfast, Belfast BT7 1NN (Northern Ireland)
The presence of caesium in hydrogen discharges is known to increase the extracted negative hydrogen ion current by up to sixteen fold. The mechanism for this phenomenon is not understood. Here Langmuir probe and photodetachment techniques have been used to measure the effects on plasma parameters, including the negative ion density, of adding caesium and xenon to a multicusp ion source. The addition of xenon, also a heavy element but unreactive, allows possible negative ion confinement effects to be explored. No significant change in the negative ion density was observed when up to 20{percent} xenon was introduced, although other plasma parameter changes were observed. Caesium addition increased the negative ion concentration. This increase was found to depend on the wall temperature. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 451120
- Report Number(s):
- CONF-9510304--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 380; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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