Plasma ignition schemes for the SNS radio-frequency driven H- source
The H{sup -} ion source for the Spallation Neutron Source (SNS) is a cesiated, radio-frequency driven (2 MHz) multicusp volume source which operates at a duty cycle of 6% (1 ms pulses and 60 Hz). In pulsed RF driven plasma sources, ignition of the plasma affects the stability of source operation and the antenna lifetime. We are reporting on investigations of different ignition schemes, based on secondary electron generation in the plasma chamber by UV light, a hot filament, a low power RF plasma (cw, 13.56 MHz), as well as source operation solely with the high power (40 kW) 2 MHz RF. We find that the dual frequency, single antenna scheme is most attractive for the operating conditions of the SNS H{sup -} source.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director, Office of Science (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 788039
- Report Number(s):
- LBNL-47775; R&D Project: 8212CU; TRN: US0110644
- Resource Relation:
- Conference: 9th International Conference on Ion Sources (ICIS'01), Oakland, CA (US), 09/03/2001--09/07/2001; Other Information: PBD: 6 Sep 2001
- Country of Publication:
- United States
- Language:
- English
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