First observation of RMP ELM mitigation on MAST Upgrade

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F24%3A00617261" target="_blank" >RIV/61389021:_____/24:00617261 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1361-6587/ad6d53" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6587/ad6d53</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6587/ad6d53" target="_blank" >10.1088/1361-6587/ad6d53</a>

Jazyk výsledku

angličtina

Název v původním jazyce

First observation of RMP ELM mitigation on MAST Upgrade

Popis výsledku v původním jazyce

The first experimental attempts at controlling edge localised modes (ELMs) via the application of resonant magnetic perturbations on the MAST Upgrade tokamak are reported. Using the linear MHD model MARS-F, the phase shift between the upper and lower coil rows ∆Φ was optimised for toroidal mode number n = 1 and n = 2 fields, to provide forward guidance to experiments. In low βN discharges, the application of n = 1 3D fields caused the ELM frequency fELM to increase by over a factor 20 relative to the reference, and also induced a locked mode, which did not cause a plasma termination nor an H-L back transition. However when βN was raised, this induced locked mode caused plasma termination which precluded mitigation access. Initially, applying a numerically optimised n = 2 field had no effect. However applying a rigid toroidal shift to this field caused a locked mode disruption, demonstrating the presence of a substantial n = 2 error field. Coil current ramps were conducted with ∆Φ set at 6 different values, resulting in either locked mode disruptions or no effect, but mitigation with n = 2 fields was not established.

Název v anglickém jazyce

First observation of RMP ELM mitigation on MAST Upgrade

Popis výsledku anglicky

The first experimental attempts at controlling edge localised modes (ELMs) via the application of resonant magnetic perturbations on the MAST Upgrade tokamak are reported. Using the linear MHD model MARS-F, the phase shift between the upper and lower coil rows ∆Φ was optimised for toroidal mode number n = 1 and n = 2 fields, to provide forward guidance to experiments. In low βN discharges, the application of n = 1 3D fields caused the ELM frequency fELM to increase by over a factor 20 relative to the reference, and also induced a locked mode, which did not cause a plasma termination nor an H-L back transition. However when βN was raised, this induced locked mode caused plasma termination which precluded mitigation access. Initially, applying a numerically optimised n = 2 field had no effect. However applying a rigid toroidal shift to this field caused a locked mode disruption, demonstrating the presence of a substantial n = 2 error field. Coil current ramps were conducted with ∆Φ set at 6 different values, resulting in either locked mode disruptions or no effect, but mitigation with n = 2 fields was not established.

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

2024

Kód důvěrnosti údajů

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

Název periodika

Plasma Physics and Controlled Fusion

ISSN

0741-3335

e-ISSN

1361-6587

Svazek periodika

66

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

105003

Kód UT WoS článku

001294910700001

EID výsledku v databázi Scopus

2-s2.0-85202804271