Study of blob-like structures in QUEST

H. Q. Liu, Kazuaki Hanada, N. Nishino, R. Ogata, M. Ishiguro, H. Zushi, Kazuo Nakamura, M. Sakamoto, Hiroshi Idei, akihide fujisawa, Makoto Hasegawa, Y. Higashizono, S. Kawasaki, H. Nakashima, A. Higashijima

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Abstract

Blob-like structures are observed in an open magnetic field line configuration of electron cyclotron resonance (ECR) heating plasma in QUEST. The combined measurement with a fast camera and a movable Langmuir probe show that visible filamentary structures extended along field lines do correspond to over-dense plasma structures. Ion saturation current time trace shows a front-like asymmetric burst when a visible structure reaches the probe during its outward propagation. The typical radial velocity of the blob-like structure, Vb, was measured as ∼1 km/s with the fast camera at the intermediate area. Vb increased as the blob-like structure moved along major radius, R (outward). The average velocity of E × B drift derived from the probe measurement, slightly larger than Vb, was also increased as the blob-like structure propagated to larger R.

Original languageEnglish
JournalJournal of Nuclear Materials
Volume415
Issue number1 SUPPL
DOIs
Publication statusPublished - Aug 1 2011

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

Cite this

Liu, H. Q., Hanada, K., Nishino, N., Ogata, R., Ishiguro, M., Zushi, H., ... Higashijima, A. (2011). Study of blob-like structures in QUEST. Journal of Nuclear Materials, 415(1 SUPPL). https://doi.org/10.1016/j.jnucmat.2010.12.225