Energy resolved soft x-ray imaging using a charge coupled device camera for long pulse discharges in the Large Helical Device

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

DOI:https://doi.org/10.1063/1.2953676· OSTI ID:21266589

Suzuki, C; Ida, K; Yoshinuma, M ^[1]; Kobuchi, T ^[2]

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1. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)
2. Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai 980-8579 (Japan)

Energy resolved soft x-ray imaging system using a charge coupled device camera and a multifilter disk has recently been installed to the Large Helical Device for the measurements in the long pulse discharges. Eight images with different cutoff energies are measured sequentially during a single discharge by rotating a filter disk mounting eight beryllium filters with different thicknesses. A tangential line-integrated profile for a specific photon energy range can be obtained by taking intensity difference between two images measured with a filter pair of adjacent thicknesses. The typical photon energy corresponding to each difference ranges from 1.9 to 4.8 keV with the bandwidth of 2-3 keV. In the initial results, the difference in the line-integrated soft x-ray profile by the energy range has been clearly observed. This diagnostic method can possibly be applied to the observation of the dependence of two dimensional soft x-ray profile on photon energy range especially if local non-Maxwellian component appears in electron energy distribution function.

• OSTI ID: 21266589
• 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: 10.1063/1.2953676; (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

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BERYLLIUM
CAMERAS
CHARGE-COUPLED DEVICES
DISTRIBUTION FUNCTIONS
ELECTRONS
ENERGY SPECTRA
FILTERS
IMAGES
KEV RANGE
LHD DEVICE
PHOTONS
PULSES
SENSORS
SOFT X RADIATION
THICKNESS
TWO-DIMENSIONAL CALCULATIONS