H{alpha} measurements and neutral particle transport in Heliotron J

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

DOI:https://doi.org/10.1063/1.2347621· OSTI ID:20861234

Kobayashi, S; Yabutani, H; Nakashima, Y; Higashizono, Y; Nagasaki, K; Mizuuchi, T; Okada, H; Sano, F; Cappa, A; Kondo, K; Nakamura, Y; Suzuki, Y ^[1]

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1. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan)

A multichannel system of the H{alpha}-line emission detector is developed in order to investigate the neutral particle transport in the Heliotron J plasma. The application of a multianode photomultiplier tube to the filter measurement system enables us to observe the H{alpha} emission profile with 32 chords. The absolute calibration with a standard lamp is performed and the cross-talk between each of the adjoining channels is evaluated to be less than 6%, while the photomultiplier tube has a typical cross-talk of 3% in nominal value. The temporal and spatial profiles of the H{alpha} emission are measured in detail in the plasma breakdown by electron cyclotron heating (ECH). The H{alpha} emission profile in the ECH plasma is calculated by the Monte Carlo simulation using a three-dimensional mesh model. The fueling rates of the wall recycling and the gas puffing are estimated by means of the simulation and the measurement.

• OSTI ID: 20861234
• Journal Information: Review of Scientific Instruments, Vol. 77, Issue 10; Other Information: DOI: 10.1063/1.2347621; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COMPUTERIZED SIMULATION
ECR HEATING
EMISSION
HELIOTRON
MONTE CARLO METHOD
NEUTRAL-PARTICLE TRANSPORT
PHOTOMULTIPLIERS
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA SIMULATION
RF SYSTEMS
STELLARATORS
THREE-DIMENSIONAL CALCULATIONS
WALL EFFECTS