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Report No.
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Issues and developments of spectroscopic diagnostics for ITER

Iwamae, Atsushi; Sugie, Tatsuo; Ogawa, Hiroaki; Kasai, Satoshi*; Kusama, Yoshinori

In order to evaluate the impurity influx in the divertor plasma we need the average values of the ionization rate coefficient and the excitation rate coefficient. For the impurity influx of carbon, beryllium and tungsten, the accuracy of 30% is required in specification for plasma measurements on ITER. We review the present status of atomic data for tungsten. The theoretical value of S/XB, where S and X are the ionization and excitation rate coefficient, respectively, is two times higher than experimental. A prototype of the collection optics, Cassegrain telescope and micro lens array coupled with optical fiber bundle etc. has been examined. Preliminary results are reported. Two viewing fan observing divertor gap is proposed. Computerized tomographic reconstruction is performed for the model intensity distribution with the two viewing fan. We estimate the line-of-sight integrated emission intensity of carbon impurity with simulation of B2 code on ITER divertor plasma.

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