Power deposition on misaligned edges in COMPASS.
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00481467" target="_blank" >RIV/61389021:_____/17:00481467 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.nme.2016.09.009" target="_blank" >http://dx.doi.org/10.1016/j.nme.2016.09.009</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.nme.2016.09.009" target="_blank" >10.1016/j.nme.2016.09.009</a>
Alternative languages
Result language
angličtina
Original language name
Power deposition on misaligned edges in COMPASS.
Original language description
If the decision is made not to apply a toroidal chamfer to tungsten monoblocks at ITER divertor vertical targets, exposed leading edges will arise as a result of assembly tolerances between adjacent plasma-facing components. Then, the advantage of glancing magnetic field angles for spreading plasma heat flux on top surfaces is lost at the misaligned edges with an interaction occurring at near normal incidence, which can drive melting for the expected inter-ELM heat fluxes. A dedicated experiment has been performed on the COMPASS tokamak to thoroughly study power deposition on misaligned edges using inner-wall limited discharges on a special graphite tile presenting gaps and leading edges directly viewed by a high resolution infra-red camera. The parallel power flux deducted from the unperturbed measurement far from the gap is fully consistent with the observed temperature increase at the leading edge, respecting the power balance. All the power flowing into the gap is deposited at the leading edge and no mitigation factor is required to explain the thermal response. Particle-in-cell simulations show that the ion Larmor smoothing effect is weak and that the power deposition on misaligned edges is well described by the optical approximation because of an electron dominated regime associated with non-ambipolar parallel current flow.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
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
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Nuclear Materials and Energy
ISSN
2352-1791
e-ISSN
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Volume of the periodical
12
Issue of the periodical within the volume
August
Country of publishing house
US - UNITED STATES
Number of pages
5
Pages from-to
1374-1378
UT code for WoS article
000417293300230
EID of the result in the Scopus database
2-s2.0-84990842224