Scrape-off layer turbulence in TCV: evidence in support of stochastic modelling

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00459853" target="_blank" >RIV/61389021:_____/16:00459853 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/0741-3335/58/4/044006" target="_blank" >http://dx.doi.org/10.1088/0741-3335/58/4/044006</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/0741-3335/58/4/044006" target="_blank" >10.1088/0741-3335/58/4/044006</a>

Result language
angličtina
Original language name
Scrape-off layer turbulence in TCV: evidence in support of stochastic modelling
Original language description
Intermittent fluctuations in the TCV scrape-off layer have been investigated by analysingnlong Langmuir probe data time series under stationary conditions, allowing calculation ofnfluctuation statistics with high accuracy. The ion saturation current signal is dominated by thenfrequent occurrence of large-amplitude bursts attributed to filament structures moving throughnthe scrape-off layer. The average burst shape is well described by a double-exponentialnwave-form with constant duration, while the waiting times and peak amplitudes of the burstsnboth have an exponential distribution. Associated with bursts in the ion saturation currentnis a dipole-shaped floating potential structure and radially outwards directed electric driftnvelocity and particle flux, with average peak values increasing with the saturation current burstnamplitude. The floating potential fluctuations have a normal probability density function whilenthe distributions for the ion saturation current and estimated radial velocity have exponentialntails for large fluctuations. These findings are discussed in the light of prevailing theories fornfilament motion and a stochastic model for intermittent scrape-off layer plasma fluctuations.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BL - Plasma physics and discharge through gases
OECD FORD branch
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Project
<a href="/en/project/GAP205%2F12%2F2327" target="_blank" >GAP205/12/2327: Investigation of plasma boundary of tokamak COMPASS using two deeply-reciprocating probes, interpreted by numerical models</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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