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Reynolds stress and fluctuation measurements with Langmuir and ball-pen probes in the vicinity of the L-H transition on COMPASS.
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SYSNO ASEP 0482694 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Reynolds stress and fluctuation measurements with Langmuir and ball-pen probes in the vicinity of the L-H transition on COMPASS. Author(s) Grover, Ondřej (UFP-V) ORCID
Seidl, Jakub (UFP-V) RID
Adámek, Jiří (UFP-V) RID, ORCID
Vondráček, Petr (UFP-V) RID, ORCID
Tomeš, Matěj (UFP-V)
Weinzettl, Vladimír (UFP-V) RID, ORCID
Hron, Martin (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDArticle number P2.181 Source Title EPS 2017: 44th European Physical Society Conference on Plasma Physics, 41F. - Mulhouse : European Physical Society, 2017 / Fajardo M. ; Westerhof E. ; Riconda C. ; Melzer A. ; Bret A. ; Dromey B. - ISBN 979-10-96389-07 Number of pages 4 s. Publication form Online - E Action EPS 2017 Conference on Plasma Physics/44./ Event date 26.06.2017 - 30.06.2017 VEvent location Belfast Country IE - Ireland Event type EUR Language eng - English Country FR - France Keywords COMPASS ; Reynolds stress (RS) ; Langmuir probes Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA16-25074S GA ČR - Czech Science Foundation (CSF) GA15-10723S GA ČR - Czech Science Foundation (CSF) 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 Annotation The Reynolds stress force ¶rh˜ vp ˜ vri due to the Reynolds stress (RS) h˜ vp ˜ vri has been identified in recent models and experiments [1] as a likely driver of poloidal zonal flows which are expected to play a key role in the L-H transition and the associated limit cycle oscillations (LCO) [2] in the predator-prey-like interaction of zonal flows with turbulence.
One common method of measuring the RS is to measure fluctuations of electric fields with arrays of Langmuir probes. However, such measurements may be influenced by the fluctuations of the electron temperature. Similar probe head arrangements have been also used to investigate the dynamics of density fluctuations and electric fields during LCO [2]. In order to investigate
the role of temperature fluctuations and LCO dynamics, two similar probe heads equipped with both Langmuir (LP) and ball-pen (BPP) [3] probes in similar geometric configurations were developed, installed and used at the COMPASS tokamak [4]. This contribution reports on the results of measurements with these probe heads, specifically on the comparison of RS profiles
obtained with BPP and LP and the investigation of limit cycle oscillations during the L-H transition on COMPASS.Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
Number of the records: 1