High frequency operation of a hot filament cathode for a magnetized plasma ion source
Journal Article
·
· Review of Scientific Instruments
- Graduate School of Engineering, Doshisha University, Kyoto 610-0321 (Japan)
- Faculty of Life Medical Sciences, Doshisha University, Kyoto 610-0321 (Japan)
A tungsten filament cathode has been operated with an ac heating current to excite a plasma in a linear magnetic field. Both the discharge current and the ion saturation current in plasma near the extraction hole of the ion source exhibited fluctuations. The discharge current fluctuated with the amplitude less than 2% of the average, and the frequency two times the frequency of the heating current. Fluctuation amplitude of the ion saturation current was about 10% of the average, while the frequency was the same as that of the heating current. The ac operation has prolonged the lifetime of a hot filament cathode by about 50%.
- OSTI ID:
- 22066332
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 2 Vol. 83; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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