Subdiffusive transport of runaway electrons in presence of small amplitude MHD perturbations in COMPASS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F24%3A00585677" target="_blank" >RIV/61389021:_____/24:00585677 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/24:00372826

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1741-4326/ad0e31" target="_blank" >https://iopscience.iop.org/article/10.1088/1741-4326/ad0e31</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1741-4326/ad0e31" target="_blank" >10.1088/1741-4326/ad0e31</a>

Result language

angličtina

Original language name

Subdiffusive transport of runaway electrons in presence of small amplitude MHD perturbations in COMPASS

Original language description

Radial transport of runaway electrons (REs) in tokamaks is affected by the presence of magnetic perturbations, either caused by internal magnetohydrodynamic instabilities or induced by external coils. The magnetic field configuration inside the plasma volume consists in general of intact magnetic surfaces alternated with magnetic islands and stochastic layers, which make the usual diffusive approach, based on the Rechester-Rosenbluth formula, inadequate to the study of transport. Here the fractional diffusion approach is employed to model RE transport in presence of intrinsic magnetic perturbations (magnetic islands) in the flat-top phase of RE-dedicated discharges on COMPASS tokamak. The character of RE transport is found to be subdiffusive. The degree of subdiffusion is evaluated by running simulations with the ORBIT code and a time-fractional diffusion equation is applied to calculate the time evolution of RE particle number. The results are compared with the observed RE losses, estimated from the time integrated neutron signal.

Czech name

—

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

Nuclear Fusion

ISSN

0029-5515

e-ISSN

1741-4326

Volume of the periodical

64

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

16

Pages from-to

016027

UT code for WoS article

001112039200001

EID of the result in the Scopus database

2-s2.0-85179837004