Impact of the upstream plasma parameters on the spectroscopic measurement in the GAMMA 10/PDX divertor simulation experiments

Takayuki Yokodo, Yousuke Nakashima, Akiyoshi Hatayama, Takaaki Iijima, Md Shahinul Islam, Tsubasa Yoshimoto, Kazuya Ichimura, Md Maidul Islam, Guanyi Lee, Sotaro Yamashita, Akihiro Terakado, Kunpei Nojiri, Masayuki Yoshikawa, Junko Kohagura, Naomichi Ezumi, Mizuki Sakamoto, Tsuyoshi Imai

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Abstract

Detailed results of spectral measurements in the gas injection performed in GAMMA 10/PDX divertor simulation experiments are presented. From the comparison of the emission intensity at the end-cell and plug/barriercell, impurity behavior along the magnetic field line is discussed in GAMMA 10/PDX. The emission intensity of Ar II is decreased due to the increase in the background plasma density and the end loss particle flux, which consequently suppresses the Ar particle transport towards the upstream region. The ECH in the plug-cell (EPECH) was applied to investigate the influence of the heating on the emission of injected impurities. Ar II intensity slightly increased EP-ECH. On the other hand, Kr II and Xe II decreased at the plug/barrier-cell.

Original languageEnglish
Article number3402032
JournalPlasma and Fusion Research
Volume13
DOIs
StatePublished - 2018
Externally publishedYes

Keywords

  • Divertor
  • GAMMA 10/PDX
  • Impurity transport
  • Noble gas
  • Spectroscopic measurement

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