Characteristics of X-point lobe structures in single-null discharges on MAST

Kód výsledku v IS VaVaI

RIV/61389021:_____/14:00434796 - isvavai.cz

Výsledek na webu

http://dx.doi.org/10.1088/0029-5515/54/6/064015

DOI - Digital Object Identifier

10.1088/0029-5515/54/6/064015

Jazyk výsledku

angličtina

Název v původním jazyce

Characteristics of X-point lobe structures in single-null discharges on MAST

Popis výsledku v původním jazyce

Lobe structures due to the application of resonant magnetic perturbations (RMPs) have been observed using wide-angle imaging of light from He1+ ions in the vicinity of the lower X-point in MAST. Above a threshold value the lobe structures extend radially, linearly with the coil current, both in L-mode and H-mode. After the application of the RMP, as the toroidal rotation in the confined plasma decreases, the lobes extend radially. This suggests the plasma is less effectively screening the RMP field. Comparing the imaging data with results from vacuum modelling shows that this technique can accurately predict the number and poloidal location of the lobes, but over-estimates their radial extent. More accurate estimates of the extent of the lobes can be made by accounting for plasma screening of the RMP field. Qualitative agreement between simulation and experiment is found if it is assumed that the RMP penetrates 2% in normalized radius from the last closed flux surface.

Název v anglickém jazyce

Characteristics of X-point lobe structures in single-null discharges on MAST

Popis výsledku anglicky

Lobe structures due to the application of resonant magnetic perturbations (RMPs) have been observed using wide-angle imaging of light from He1+ ions in the vicinity of the lower X-point in MAST. Above a threshold value the lobe structures extend radially, linearly with the coil current, both in L-mode and H-mode. After the application of the RMP, as the toroidal rotation in the confined plasma decreases, the lobes extend radially. This suggests the plasma is less effectively screening the RMP field. Comparing the imaging data with results from vacuum modelling shows that this technique can accurately predict the number and poloidal location of the lobes, but over-estimates their radial extent. More accurate estimates of the extent of the lobes can be made by accounting for plasma screening of the RMP field. Qualitative agreement between simulation and experiment is found if it is assumed that the RMP penetrates 2% in normalized radius from the last closed flux surface.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

—

Projekt

GAP205/11/2341: Kontrola okrajových nestabilit plazmatu v tokamacích pomocí vnějších magnetických poruch

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Nuclear Fusion

ISSN

0029-5515

e-ISSN

—

Svazek periodika

54

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

AT - Rakouská republika

Počet stran výsledku

9

Strana od-do

064015-064015

Kód UT WoS článku

000336893100016

EID výsledku v databázi Scopus

—