[Table of Contents]

Plasma and Fusion Research

Volume 8, 2402140 (2013)

Regular Articles


Design for X-Ray Imaging Spectroscopy in Large Helical Device
Sadatsugu MUTO and LHD Experimental Group
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
(Received 22 November 2012 / Accepted 27 June 2013 / Published 15 November 2013)

Abstract

An assembly of pin-hole camera has been designed for x-ray imaging spectroscopy in Large Helical Device (LHD). In the design the camera basically consists of a 2-D-pixel-array detector, a metallic filter, and a pin hole. The detector measures gray scale images through the filter, while the thickness of the filter changes shot by shot. The gray scale images are mathematically transformed to a color spectral image by means of Mellin transform. The available spectral range is depending on the material of the filter. The spectral energy resolution is also depending on the material of the filter and the intensity of incident x-ray. In the case of the filter made of aluminum, the spectral range is theoretically predicted to be from 3.0 keV to 30 keV. It is also theoretically expected in the case of typical LHD plasmas that 50 flames of color spectral 32 × 32-pixel-image is obtained per second with a spectral resolution of E/ΔE = 4.3 at a photon energy of E = 5.0 keV.


Keywords

x-ray, imaging, absorption coefficient

DOI: 10.1585/pfr.8.2402140


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This paper may be cited as follows:

Sadatsugu MUTO and LHD Experimental Group, Plasma Fusion Res. 8, 2402140 (2013).