H-L transition caused by irregular probe insertion in the JFT-2M tokamak

K. Hanada, M. Hasegawa, K. Shinohara, S. Ohdachi, T. Shoji, Y. Miura, H. Tamai, T. Oikawa, H. Totsuka, E. Ishiyama, N. Shinoda, S. Shiraiwa, H. Saito, Y. Endo, K. Yamagishi, H. Toyama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A pair of probe pins whose lengths differ by 5 mm are inserted into the separatrix of H-mode plasmas. When the long pin is biased positively against the short one, the H-L transition takes place and the current through the resistor making a connection between these pins increases for 10 μs and the potential of the pin increases for 100 μs. The energy dissipated by the resistor during the H-L transition is comparable to the energy of the radial electric field in H-mode plasma. When the long pin is biased negatively, the H-L transition also occurs; however, it takes 1 ms to change the potential of the pin and the plasma returns to H-mode after the extraction of the probe.

Original languageEnglish
Pages (from-to)1255-1259
Number of pages5
JournalPlasma Physics and Controlled Fusion
Volume38
Issue number8
DOIs
Publication statusPublished - 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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