Fast infrared thermography on the COMPASS tokamak

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10379319" target="_blank" >RIV/00216208:11320/17:10379319 - isvavai.cz</a>
Alternative codes found
RIV/61389021:_____/17:00481820 RIV/68407700:21340/17:00326940
Result on the web
<a href="https://doi.org/10.1016/j.fusengdes.2017.05.004" target="_blank" >https://doi.org/10.1016/j.fusengdes.2017.05.004</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.fusengdes.2017.05.004" target="_blank" >10.1016/j.fusengdes.2017.05.004</a>

Result language
angličtina
Original language name
Fast infrared thermography on the COMPASS tokamak
Original language description
A new fast infrared camera was purchased on the COMPASS tokamak recently. It is equipped with a medium wavelength infrared (3-5 mm) InSb detector and is capable of reaching framerate up to 1.9 kHz in full frame acquisition mode (320 x 256 px.) and up to 90 kHz in sub-windowed mode (64 x 4 px.). First experimental measurements of plasma heat flux to inner and outer wall limiters of the COMPASS tokamak using the new camera are presented. Time evolution of parallel heat flux during sawtooth instability is studied showing strong modulation of the heat flux absolute value whilst keeping constant its radial decay length. Fast modulation of outboard midplane limiter heat loading due to runaway electrons is also presented. The camera will be part of a new fast divertor thermographic system with exceptional spatial resolution (similar to 0.6-1.3 mm/px. on the target plane, 0.04-0.14 mmipx. mapped to the outer midplane) with a possibility of measurements of radial profiles on the divertor with 320 x 4 px. with temporal resolution better than 20 mu s. A design of the foreseen optical divertor system is described together with a design of a special divertor graphite tile used for the IR thermography, that will allow in-situ surface emissivity calibration.
Czech name
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Czech description
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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)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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