Conceptual design of reciprocating probes and material-testing manipulator for tokamak COMPASS Upgrade
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F22%3A00361565" target="_blank" >RIV/68407700:21340/22:00361565 - isvavai.cz</a>
Alternative codes found
RIV/61389021:_____/22:00555588
Result on the web
<a href="https://doi.org/10.1088/1748-0221/17/02/C02007" target="_blank" >https://doi.org/10.1088/1748-0221/17/02/C02007</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1748-0221/17/02/C02007" target="_blank" >10.1088/1748-0221/17/02/C02007</a>
Alternative languages
Result language
angličtina
Original language name
Conceptual design of reciprocating probes and material-testing manipulator for tokamak COMPASS Upgrade
Original language description
Three new in-vessel manipulators are designed and built for the new COMPASS Upgrade tokamak with uniquely high vessel temperature (250-500 degrees C) and heat flux density (perpendicular to divertor surface q(perpendicular to) similar to 80 MW/m(2) and q(parallel to) similar to GW/m(2) at separatrix), which challenges the edge plasma diagnostics. Here we show their detailed engineering designs supported by heat conduction and mechanical models. Deep reciprocation of electrostatic probes near the separatrix should be possible by optimizing older concepts in (a) the head and probe geometry, (b) strongly increasing the deceleration up to 100x gravity by springs and strengthening the manipulator mechanical structure. One reciprocates close to the region of edge plasma influx (the outer midplane), the other at the plasma sink (between the outer divertor strike point and X-point), for studying the plasma divertor (impurity-seeded) detachment and liquid metal vapor transport. Both probe heads are equipped with a set of ball-pen and Langmuir probes, measuring reliably and extremely fast (10(-6) s) local (1 mm resolution) plasma potential, density, electron temperature and heat flux and even ion temperature with 10(-5) s resolution. The divertor manipulator (without reciprocation) will place various material test targets at the outer divertor. Unique will be its capability to increase 15x the surface heat flux with respect to the surrounding tungsten tiles just by controllable surface inclination of the test targets. We plan to test liquid metal targets where such inclined surface was found critical to achieve the desired mode with lithium vapor shielding. Even in the conservative expected performance of COMPASS Upgrade, we predict to reach and survive the EU DEMO relevant heat fluxes.
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
10304 - Nuclear physics
Result continuities
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
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Instrumentation
ISSN
1748-0221
e-ISSN
1748-0221
Volume of the periodical
17
Issue of the periodical within the volume
2
Country of publishing house
IT - ITALY
Number of pages
7
Pages from-to
3-9
UT code for WoS article
000791423900012
EID of the result in the Scopus database
2-s2.0-85125640769