Filamentary velocity scaling validation in the TCV tokamak

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F18%3A00495669" target="_blank" >RIV/61389021:_____/18:00495669 - isvavai.cz</a>

Výsledek na webu

<a href="https://aip.scitation.org/doi/pdf/10.1063/1.5038019?class=pdf" target="_blank" >https://aip.scitation.org/doi/pdf/10.1063/1.5038019?class=pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5038019" target="_blank" >10.1063/1.5038019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Filamentary velocity scaling validation in the TCV tokamak

Popis výsledku v původním jazyce

A large database of reciprocating probe data from the edge plasma of TCV (Tokamak a Configuration Variable) is used to test the radial velocity scalings of filaments from analytical theory [Myra et al., Phys. Plasmas 13, 112502 (2006)]. The measured velocities are mainly scattered between zero and a maximum velocity which varies as a function of size and collisionality in agreement with the analytical scalings. The scatter is consistent with mechanisms that tend to slow the velocity of individual filaments. While the radial velocities were mainly clustered between 0.5 and 2 km/s, a minority reached outward velocities as high as 5 km/s or inward velocities as high as4 km/s. Inward moving filaments are only observed in regions of high poloidal velocity shear in discharges with B x del B away from the X-point, a new finding. The filaments have diameters clustered between 3 and 11 mm, and normalized sizes (a) over cap a clustered between 0.3 and 1.1, such that most filaments populate the resistive-ballooning regime, therefore, most of the filaments in TCV have radial velocities with little or no dependence on collisionality. Improvements in cross-correlation techniques and conditional averaging techniques are discussed which reduce the sizes determined for the largest filaments, including those larger than the scrapeoff layer.

Název v anglickém jazyce

Filamentary velocity scaling validation in the TCV tokamak

Popis výsledku anglicky

A large database of reciprocating probe data from the edge plasma of TCV (Tokamak a Configuration Variable) is used to test the radial velocity scalings of filaments from analytical theory [Myra et al., Phys. Plasmas 13, 112502 (2006)]. The measured velocities are mainly scattered between zero and a maximum velocity which varies as a function of size and collisionality in agreement with the analytical scalings. The scatter is consistent with mechanisms that tend to slow the velocity of individual filaments. While the radial velocities were mainly clustered between 0.5 and 2 km/s, a minority reached outward velocities as high as 5 km/s or inward velocities as high as4 km/s. Inward moving filaments are only observed in regions of high poloidal velocity shear in discharges with B x del B away from the X-point, a new finding. The filaments have diameters clustered between 3 and 11 mm, and normalized sizes (a) over cap a clustered between 0.3 and 1.1, such that most filaments populate the resistive-ballooning regime, therefore, most of the filaments in TCV have radial velocities with little or no dependence on collisionality. Improvements in cross-correlation techniques and conditional averaging techniques are discussed which reduce the sizes determined for the largest filaments, including those larger than the scrapeoff layer.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Physics of Plasmas

ISSN

1070-664X

e-ISSN

—

Svazek periodika

25

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

—

Kód UT WoS článku

000440589100041

EID výsledku v databázi Scopus

2-s2.0-85050503145