Reynolds stress and fluctuation measurements with Langmuir and ball-pen probes in the vicinity of the L-H transition on COMPASS.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00482694" target="_blank" >RIV/61389021:_____/17:00482694 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Reynolds stress and fluctuation measurements with Langmuir and ball-pen probes in the vicinity of the L-H transition on COMPASS.

Original language description

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.nOne 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 investigatenthe 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 profilesnobtained with BPP and LP and the investigation of limit cycle oscillations during the L-H transition on COMPASS.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

EPS 2017: 44th European Physical Society Conference on Plasma Physics

ISBN

979-10-96389-07

ISSN

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e-ISSN

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Number of pages

4

Pages from-to

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Publisher name

European Physical Society

Place of publication

Mulhouse

Event location

Belfast

Event date

Jun 26, 2017

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

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