Filamentary velocity scaling validation in the TCV tokamak

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

Filamentary velocity scaling validation in the TCV tokamak

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

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

Name of the periodical

Physics of Plasmas

ISSN

1070-664X

e-ISSN

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Volume of the periodical

25

Issue of the periodical within the volume

7

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

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UT code for WoS article

000440589100041

EID of the result in the Scopus database

2-s2.0-85050503145