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

Result code in 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>
Alternative codes found
RIV/61389021:_____/15:00445077
Result on the web
<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>

Result language
angličtina
Original language name
Narrow heat flux channels in the COMPASS limiter scrape-off layer
Original language description
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.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BL - Plasma physics and discharge through gases
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
S - Specificky vyzkum na vysokych skolach

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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