Empirical scaling of the n = 2 error field penetration threshold in tokamaks

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F20%3A00541091" target="_blank" >RIV/61389021:_____/20:00541091 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/20:10423240

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1741-4326/ab94f8" target="_blank" >https://iopscience.iop.org/article/10.1088/1741-4326/ab94f8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1741-4326/ab94f8" target="_blank" >10.1088/1741-4326/ab94f8</a>

Result language

angličtina

Original language name

Empirical scaling of the n = 2 error field penetration threshold in tokamaks

Original language description

This paper presents a multi-machine, multi-parameter scaling law for the n = 2 core resonant error field threshold that leads to field penetration, locked modes, and disruptions. Here, n is the toroidal harmonic of the non-axisymmetric error field (EF). While density scalings have been reported by individual tokamaks in the past, this work performs a regression across a comprehensive range of densities, toroidal fields, and pressures accessible across three devices using a common metric to quantify the EF in each device. The metric used is the amount of overlap between an EF and the spectrum that drives the largest linear ideal MHD resonance, known as the „dominant mode overlap”. This metric, which takes into account both the external field and plasma response, is scaled against experimental parameters known to be important for the inner layer physics. These scalings validate non-linear MHD simulation scalings, which are used to elucidate the dominant inner layer physics. Both experiments and simulations show that core penetration thresholds for EFs with toroidal mode number n = 2 are of the same order as the n = 1 thresholds that are considered most dangerous on current devices. Both n = 1 and n = 2 thresholds scale to values within the ITER design tolerances, but data from additional devices with a range of sizes are needed in order to increase confidence in quantitative extrapolations of n = 2 thresholds to ITER.

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

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

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

—

Volume of the periodical

60

Issue of the periodical within the volume

8

Country of publishing house

AT - AUSTRIA

Number of pages

15

Pages from-to

086010

UT code for WoS article

000553758500001

EID of the result in the Scopus database

2-s2.0-85086570581