Extraction of a strongly focusing He{sup +} beam from three-stage concave electrodes for alpha particle measurement system in ITER

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

DOI:https://doi.org/10.1063/1.3673630· OSTI ID:22075528

Kobuchi, T; Kisaki, M; Tsumori, K; Kaneko, O ^[1]; Sasao, M; Tanaka, N; Okamoto, A; Kitajima, S ^[2]; Shinto, K ^[3]; Wada, M ^[4]

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1. National Institute for Fusion Science, Toki, Gifu 509-5292 (Japan)
2. Graduate School of Engineering, Tohoku University, Sendai 980-8579 (Japan)
3. IFMIF R and D Center, Japan Atomic Energy Agency, Rokkasho, Aomori 039-3212 (Japan)
4. Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 (Japan)

A strongly focusing He{sup +} ion beam source equipped with concave multi-aperture electrodes was developed for production of He{sup -} through a charge exchange cell. The beam was extracted at a voltage less than 20 kV from 301 apertures distributed in an area of 100 mm {phi}, and focused at 750 mm distance. The beam current and the beam size of 2 A and 20 mm in diameter, respectively, were achieved with an arc power less than 10 kW. The optimum perveance was obtained at 0.02 A/kV{sup 1.5} at the beam energy less than 20 keV which is suitable for the conversion to He{sup -} in an alkali vapor cell.

• OSTI ID: 22075528
• 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

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALPHA PARTICLES
BEAM CURRENTS
BEAM EXTRACTION
CHARGE EXCHANGE
ELECTRIC POTENTIAL
ELECTRODES
FOCUSING
HELIUM IONS
ION BEAMS
ION SOURCES
ITER TOKAMAK
KEV RANGE