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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP205%2F12%2F2327" target="_blank" >GAP205/12/2327: Výzkum okraje plazmatu tokamaku COMPASS pomocí dvojice hluboko zasunutých sond, interpretován počítačovými modely</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Plasma Physics and Controlled Fusion

ISSN

0741-3335

e-ISSN

—

Svazek periodika

58

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

044006

Kód UT WoS článku

000371818600009

EID výsledku v databázi Scopus

2-s2.0-84961738549