Volume Production of High Negative Hydrogen Ion Density in Low-Voltage Cesium-Hydrogen Discharge
- A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, 194024 (Russian Federation)
The work is dedicated to the theoretical and experimental investigation of the intense H- volume-plasma generation in cesium-hydrogen discharge. A low-voltage (LV) mode of the discharge, a LV arc with a heated cathode, is studied. Theory of the discharge was created. It was shown theoretically that a very high H- density ({approx}1013 cm-3) may be achieved in the discharge plasma. A comparison between the discharge theory and the experiments was fulfilled. The main plasma parameters were measured by probe method. The H- density in plasma was determined from the experimentally measured absorption of laser radiation due to the photodetachment of electrons from H- ions. The existence of a very high H- density in plasma ({approx}1013 cm-3) was proved experimentally. Theoretical modeling shows that, with a high electron emission from the cathode ({approx}10 A/cm2), the maximum H- density is located in the plasma near the anode. It allows extraction of narrow and bright H- beam through a small opening in the anode.
- OSTI ID:
- 20630795
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 763; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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