Confined alpha particle diagnostic system using an energetic He{sup 0} beam for ITER

Journal Article · Sun Oct 15 04:00:00 EDT 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2347699· OSTI ID:20861328

Sasao, M; Shinto, K; Isobe, M; Nishiura, M; Kaneko, O; Wada, M; Walker, C I; Kitajima, S; Okamoto, A; Sugawara, H; Takeuchi, S; Tanaka, N; Aoyama, H; Kisaki, M ^[1]

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1. Tohoku University, Aoba, Sendai 980-8579 (Japan)

The beam neutralization system for measurement of the spatial and velocity distributions of alpha particles of ITER plasmas was studied. As forward angle detection against the beam injection direction is required for effective neutralization, arrangement of the measurement system using possible ports in ITER configuration is proposed. The count rate of neutralized alpha particles produced by the double charge exchange interaction with energetic He{sup 0} beam particles injected is estimated. The ratios of signal to neutron-induced noise are evaluated. When a He{sup 0} beam produced by autodetachment from a 1-1.5 MeV He{sup -} beam of 10 mA is injected, the signal to noise ratio becomes greater than 1 at {rho}<0.4, even without beam modulation. Usage of a lock-in technique at the frequency of radio-frequency quadrapole accelerator will make measurement at the outer region possible.

• OSTI ID: 20861328
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 77; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCELERATORS
ALPHA PARTICLES
BEAM INJECTION
BEAM NEUTRALIZATION
BEAM-PLASMA SYSTEMS
BEAMS
CHARGE EXCHANGE
CHARGE-EXCHANGE INTERACTIONS
COUNTING RATES
ITER TOKAMAK
NOISE
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
RADIOWAVE RADIATION
SIGNAL-TO-NOISE RATIO