X-ray detector characterization and applications for plasma research - Cho, T.; Hirata, M.; Takahashi, E.; Yamaguchi, N.; Kondoh, T.; Kuwabara, T.; Yatsu, K.; Ogura, K.; Maezawa, H.; Aoki, S.; Miyoshi, S. (Elsevier)
Using synchrotron radiation, the detection characteristics of microchannel plates, silicon surface barrier detectors and gold photocathodes are investigated; in particular, the detailed structures of the detection efficiency including an extended X-ray absorption fine structure (EXAFS), an X-ray absorption near-edge structure (XANES) and a chemical shift is reported along the with discussion on the physical mechanisms. Also, the applications of these detectors to X-ray tomography diagnostics for the observation of the cross-sections of fusion-oriented tandem-mirror plasmas are described. These data give information on the spatial distribution of the hot electrons which play an important role in the formation of thermal-barrier potentials φ"b. Also, the tomographic reconstructed X-ray data in the central cell show the effect of φ"b formation on the improvement in the central-cell electron confinement for the first time.
http://linkinghub.elsevier.com/retrieve/pii/0168-583X(92)95423-O
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