Narrow heat flux channels in the COMPASS limiter scrape-off layer

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10319553" target="_blank" >RIV/00216208:11320/15:10319553 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389021:_____/15:00445077

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jnucmat.2014.11.132" target="_blank" >http://dx.doi.org/10.1016/j.jnucmat.2014.11.132</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnucmat.2014.11.132" target="_blank" >10.1016/j.jnucmat.2014.11.132</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Narrow heat flux channels in the COMPASS limiter scrape-off layer

Popis výsledku v původním jazyce

The ITER first wall is designed for start-up and ramp-down in limiter configuration. The wall panels are toroidally shaped in order to spread the incident parallel power flux q(parallel to) uniformly, assuming a single decay length lambda(q) whose valueis not known from first principles. In order to study the scaling of q(parallel to) with plasma parameters, infra-red viewing of specially-designed limiters has been used on the COMPASS tokamak in similar to 100 discharges with scans in I-p, n(e) and forall combinations of magnetic field and I-p directions. The IR measurement clearly shows that in addition to the main SOL heat flux profile with lambda(q) > 40 mm, a steep gradient (lambda(near)(q) = 4 +/- 2 mm) dominates q(parallel to) near separatrix.This appears independently of limiter shaping, insertion with respect to neighbors and incident field-line angles. Good agreement is found between the measured lambda(near)(q) and the prediction of a heuristic drift-based model.

Název v anglickém jazyce

Narrow heat flux channels in the COMPASS limiter scrape-off layer

Popis výsledku anglicky

The ITER first wall is designed for start-up and ramp-down in limiter configuration. The wall panels are toroidally shaped in order to spread the incident parallel power flux q(parallel to) uniformly, assuming a single decay length lambda(q) whose valueis not known from first principles. In order to study the scaling of q(parallel to) with plasma parameters, infra-red viewing of specially-designed limiters has been used on the COMPASS tokamak in similar to 100 discharges with scans in I-p, n(e) and forall combinations of magnetic field and I-p directions. The IR measurement clearly shows that in addition to the main SOL heat flux profile with lambda(q) > 40 mm, a steep gradient (lambda(near)(q) = 4 +/- 2 mm) dominates q(parallel to) near separatrix.This appears independently of limiter shaping, insertion with respect to neighbors and incident field-line angles. Good agreement is found between the measured lambda(near)(q) and the prediction of a heuristic drift-based model.

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

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Journal of Nuclear Materials

ISSN

0022-3115

e-ISSN

—

Svazek periodika

463

Číslo periodika v rámci svazku

Aug

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

4

Strana od-do

385-388

Kód UT WoS článku

000358467200076

EID výsledku v databázi Scopus

2-s2.0-84937731251