Conceptual design of reciprocating probes and material-testing manipulator for tokamak COMPASS Upgrade

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F22%3A00555588" target="_blank" >RIV/61389021:_____/22:00555588 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/22:00361565

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1748-0221/17/02/C02007" target="_blank" >https://iopscience.iop.org/article/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>

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 °C) and heat flux density (perpendicular to divertor surface q ⊥ ∼80 MW/m2 and q ∼GW/m2 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 100× 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 15× 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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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

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

Publication year

2022

Confidentiality

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

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

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

C02007

UT code for WoS article

000791423900012

EID of the result in the Scopus database

2-s2.0-85125640769