Laser measurement of H{sup -} ions in a field-effect-transistor based radio frequency ion source

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3680549· OSTI ID:22063890

Tanaka, N; Matsuno, T; Funaoi, T; Ando, A ^[1]; Tauchi, Y ^[2]; Nakano, H; Tsumori, K; Takeiri, Y ^[3]

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1. Tohoku University, Aramaki 6-6-05, Aoba, Sendai, Miyagi 980-8579 (Japan)
2. Yamaguchi University, Tokiwadai 2-16-1, Ube, Yamaguchi 755-8611 (Japan)
3. National Institute for Fusion Science, Oroshi-Cho 322-6, Toki, Gifu 509-5292 (Japan)

Hydrogen negative ion density measurements are required to clarify the characteristics of negative ion production and ion source performance. Both of laser photodetachment and cavity ring down (CRD) measurements have been implemented to a field-effect-transistor based radio-frequency ion source. The density ratio of negative hydrogen ions to electrons was successfully measured by laser photodetachment and effect of magnetic filter field on negative ion density was confirmed. The calculated CRD signal showed that CRD mirrors with >99.990% reflectivity are required and loss of reflectivity due to cesium contamination should be minimized.

• OSTI ID: 22063890
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
43 PARTICLE ACCELERATORS
CESIUM
ELECTRON DENSITY
ELECTRON DETACHMENT
ELECTRONS
FIELD EFFECT TRANSISTORS
HYDROGEN
HYDROGEN IONS 1 MINUS
ION DENSITY
ION SOURCES
LASER CAVITIES
LASERS
MAGNETIC FILTERS
RADIOWAVE RADIATION
REFLECTIVITY