Mutual interactions between plasma filaments in a tokamak evidenced by fast imaging and machine learning

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F24%3A00603618" target="_blank" >RIV/61389021:_____/24:00603618 - isvavai.cz</a>

Result on the web

<a href="https://journals.aps.org/pre/pdf/10.1103/PhysRevE.109.045201" target="_blank" >https://journals.aps.org/pre/pdf/10.1103/PhysRevE.109.045201</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevE.109.045201" target="_blank" >10.1103/PhysRevE.109.045201</a>

Result language

angličtina

Original language name

Mutual interactions between plasma filaments in a tokamak evidenced by fast imaging and machine learning

Original language description

Magnetically confined fusion plasmas are subject to various instabilities that cause turbulent transport of particles and heat across the magnetic field. In the edge plasma region, this transport takes the form of long filaments stretched along the magnetic field lines. Understanding the dynamics of these filaments, referred to as blobs, is crucial for predicting and controlling their impact on reactor performance. To achieve this, highly resolved passive fast camera measurements have been conducted on the COMPASS tokamak. These measurements are analyzed using both conventional tracking methods and a custom-developed machine-learning approach designed to characterize more particularly the mutual interactions between filaments. Our findings demonstrate that up to 18% of blobs exhibit mutual interactions in the investigated area close to the separatrix, at the border between confined and nonconfined plasma. Notably, we present direct observations and radial dependence of blob coalescence and splitting, rapid reversals in the propagation direction of the blob, as well as their dependence on the radial position. The comparison between observations realized with passive and gas puff imaging does not evidence any significant bias due to the use of the latter technique.

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

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Physical Review E

ISSN

2470-0045

e-ISSN

2470-0053

Volume of the periodical

109

Issue of the periodical within the volume

4

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

045201

UT code for WoS article

001221510800008

EID of the result in the Scopus database

2-s2.0-85189321582