First detachment studies on COMPASS tokamak using nitrogen seeding.

0481899 - ÚFP 2018 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Komm, Michael - Cavalier, Jordan - Seidl, Jakub - Adámek, Jiří - Bílková, Petra - Böhm, Petr - Devitre, A. - Dimitrova, Miglena - Elmore, S. - Faitsch, M. - Háček, Pavel - Havlíček, Josef - Imríšek, Martin - Krbec, Jaroslav - Peterka, Matěj - Pánek, Radomír - Popov, T. - Tomeš, Matěj - Weinzettl, Vladimír
First detachment studies on COMPASS tokamak using nitrogen seeding.
EPS 2017: 44th European Physical Society Conference on Plasma Physics. Vol. 41F. Mulhouse: European Physical Society, 2017 - (Fajardo, M.; Westerhof, E.; Riconda, C.; Melzer, A.; Bret, A.; Dromey, B.), č. článku P1.118. Europhysics Conference Abstracts (ECA). ISBN 979-10-96389-07.
[EPS 2017 Conference on Plasma Physics/44./. Belfast (IE), 26.06.2017-30.06.2017]
Grant CEP: GA ČR(CZ) GA16-14228S; GA ČR(CZ) GA15-10723S; GA MŠMT(CZ) 8D15001
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: COMPASS * tokamaks * plasma
Obor OECD: Fluids and plasma physics (including surface physics)

Partial detachment is considered to be a mandatory regime for ITER and next-step devices, as it allows to dissipate a substantial part of the heat flux carried by the plasma particles and significantly reduce the heat fluxes deposited on the divertor target tiles. Despite that, most studies of power deposition in contemporary tokamaks were performed in attached plasmas[1].
Detached regimes tend to be more difficult to access and diagnose - for example the infrared thermography (the principal diagnostics for such studies) suffers from interference caused by increased bremsstrahlung in the infrared spectrum in detached plasmas. COMPASS has a combination of a relatively short connection length to the target and an open divertor geometry, which was considered unfavourable for detachment access. In order to facilitate access to partially detached regime of operation, impurity seeding in the divertor region can be employed. In this paper, we report on first results from the impurity seeding
experiments, which were performed in Ohmic plasmas.
Trvalý link: http://hdl.handle.net/11104/0277647