Limit cycle oscillations measurements with Langmuir and ball-pen probes on COMPASS

O. Grover, J. Seidl, D. Refy, J. Adamek, P. Vondracek, M. Tomes, P. Junek, P. Hacek, J. Krbec, V. Weinzettl, M. Hron, S. Zoletnik

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Abstract

This contribution presents the experimentally observed edge plasma evolution during limit cycle oscillations (LCO) measured with a new Langmuir and ball-pen multi-pin probe head at the COMPASS tokamak. The observed LCO regime modulates the intensity of density fluctuations δne, radial electric field Er and intensity of Dα emission with a frequency 3-5 kHz. The density fluctuations grow after Er decreases in strength which appears to be strongly correlated with the evolution of the pressure gradient ∂rp. The magnetic signature of the LCO shows a left-right asymmetry with propagation from the low to high field side. High-frequency (above 100 kHz) precursor-like oscillations are observed as well.

Original languageEnglish
Article number112010
JournalNuclear Fusion
Volume58
Issue number11
DOIs
Publication statusPublished - okt. 3 2018

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Grover, O., Seidl, J., Refy, D., Adamek, J., Vondracek, P., Tomes, M., Junek, P., Hacek, P., Krbec, J., Weinzettl, V., Hron, M., & Zoletnik, S. (2018). Limit cycle oscillations measurements with Langmuir and ball-pen probes on COMPASS. Nuclear Fusion, 58(11), [112010]. https://doi.org/10.1088/1741-4326/aabb19