Spectroscopic diagnostics for ablation cloud of tracer-encapsulated solid pellet in LHD

Journal Article · Wed Oct 15 00:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2957928· OSTI ID:21266695

Tamura, N; Kalinina, D V; Sato, K; Sudo, S ^[1]; Sergeev, V Yu; Miroshnikov, I V; Sharov, I A; Bakhareva, O A; Ivanova, D M; Timokhin, V M ^[2]; Kuteev, B V ^[3]

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1. National Institute for Fusion Science, 322-6, Oroshi-cho, Toki-City, Gifu 509-5292 (Japan)
2. State Polytechnical University, Politechnicheskaya 29, St. Petersburg 195251 (Russian Federation)
3. Nuclear Fusion Institute, RRC 'Kurchatov Institute', Kurchatov square 1, Moscow 123182 (Russian Federation)

In the Large Helical Device (LHD), various spectroscopic diagnostics have been applied to study the ablation process of an advanced impurity pellet, tracer-encapsulated solid pellet (TESPEL). The total light emission from the ablation cloud of TESPEL is measured by photomultipliers equipped with individual interference filters, which provide information about the TESPEL penetration depth. The spectra emitted from the TESPEL ablation cloud are measured with a 250 mm Czerny-Turner spectrometer equipped with an intensified charge coupled device detector, which is operated in the fast kinetic mode. This diagnostic allows us to evaluate the temporal evolution of the electron density in the TESPEL ablation cloud. In order to gain information about the spatial distribution of the cloud parameters, a nine image optical system that can simultaneously acquire nine images of the TESPEL ablation cloud has recently been developed. Several images of the TESPEL ablation cloud in different spectral domains will give us the spatial distribution of the TESPEL cloud density and temperature.

• OSTI ID: 21266695
• Journal Information: Review of Scientific Instruments, Vol. 79, Issue 10; Conference: HTPD08: 17. topical conference on high-temperature plasma diagnostics, Albuquerque, NM (United States), 11-15 May 2008; Other Information: DOI: 10.1063/1.2957928; (c) 2008 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
ABLATION
CHARGE-COUPLED DEVICES
ELECTRON DENSITY
EMISSION
IMAGES
INFORMATION
LHD DEVICE
PELLETS
PENETRATION DEPTH
PHOTOMULTIPLIERS
PLASMA
PLASMA IMPURITIES
SOLIDS
SPATIAL DISTRIBUTION
SPECTROMETERS
STELLARATORS
VISIBLE RADIATION