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

Research output: Article

2 Citations (Scopus)

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

Fingerprint

COMPASS (programming language)
pens
balls
oscillations
cycles
probes
magnetic signatures
pressure gradients
asymmetry
propagation
electric fields

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Limit cycle oscillations measurements with Langmuir and ball-pen probes on COMPASS. / Grover, O.; Seidl, J.; Refy, D.; Adamek, J.; Vondracek, P.; Tomes, M.; Junek, P.; Hacek, P.; Krbec, J.; Weinzettl, V.; Hron, M.; Zoletnik, S.

In: Nuclear Fusion, Vol. 58, No. 11, 112010, 03.10.2018.

Research output: Article

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, vol. 58, no. 11, 112010. https://doi.org/10.1088/1741-4326/aabb19
Grover O, Seidl J, Refy D, Adamek J, Vondracek P, Tomes M et al. Limit cycle oscillations measurements with Langmuir and ball-pen probes on COMPASS. Nuclear Fusion. 2018 okt. 3;58(11). 112010. https://doi.org/10.1088/1741-4326/aabb19
Grover, O. ; Seidl, J. ; Refy, D. ; Adamek, J. ; Vondracek, P. ; Tomes, M. ; Junek, P. ; Hacek, P. ; Krbec, J. ; Weinzettl, V. ; Hron, M. ; Zoletnik, S. / Limit cycle oscillations measurements with Langmuir and ball-pen probes on COMPASS. In: Nuclear Fusion. 2018 ; Vol. 58, No. 11.
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AU - Vondracek, P.

AU - Tomes, M.

AU - Junek, P.

AU - Hacek, P.

AU - Krbec, J.

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AU - Hron, M.

AU - Zoletnik, S.

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