Upstream and downstream properties of turbulent transport at tokamak COMPASS
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F19%3A00365934" target="_blank" >RIV/68407700:21340/19:00365934 - isvavai.cz</a>
Result on the web
<a href="http://ocs.ciemat.es/EPS2019PAP/pdf/P2.1099.pdf" target="_blank" >http://ocs.ciemat.es/EPS2019PAP/pdf/P2.1099.pdf</a>
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Upstream and downstream properties of turbulent transport at tokamak COMPASS
Original language description
Turbulent transport in the Scrape-Off Layer (SOL) is an important issue in contemporary tokamak physics due to its role in deteriorating plasma confinement and enhancing the plasma-wall interaction. This work compares turbulence properties on two poloidal locations, the outer midplane (upstream) and the divertor target (downstream), and interprets their similarities and differences in terms of parallel transport of turbulent structures. The experimental data was measured at tokamak COMPASS, Prague, using Langmuir and ball-pen probes mounted on a reciprocating manipulator or embedded into a divertor tile. The analysis input are mainly measurements of the ion saturated current Isat , supplemented by measurements of the electron temperature Te with high temporal resolution (several μs) using the ball-pen/Langmuir probe technique [1]. To compare the upstream and downstream fluctuations of these quantities, several techniques are employed. Probability distribution functions (PDF) of the fluctuations are drawn, together with the skewness and kurtosis profiles, and their dependence on the plasma collisionality is investigated. To estimate the blob coherence along the field line, correlation of upstream and target fluctuations is attempted; however, uncertainties in the magnetic equililibrium reconstruction prove to be a major challenge in this task. The importance of Te fluctuations on the root Isat ∝ ne Te PDF is investigated, and it is found to be quite large, distorting the exponential tail of ne fluctuations into a more general shape.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
46th EPS Conference on Plasma Physics
ISBN
979-10-96389-11-7
ISSN
0378-2271
e-ISSN
0378-2271
Number of pages
4
Pages from-to
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Publisher name
European Physical Society
Place of publication
Mulhouse Cedex
Event location
Miláno
Event date
Jul 8, 2019
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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