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  4. Parallel convection and E × B drifts in the TCV snowflake divertor and their effects on target heat-fluxes
 
research article

Parallel convection and E × B drifts in the TCV snowflake divertor and their effects on target heat-fluxes

Tsui, C.K.
•
Boedo, J.A.
•
Galassi, D.
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March 2, 2021
Nuclear Fusion

Parallel convection and E × B drifts act together to redistribute heat between the strike-points mechanisms is enhanced near the secondary X-point and is shown to dominate over heat in the low field side snowflake minus (LFS SF−). The cumulative heat convection from both conduction, partly explaining why the LFS SF− distributes power more evenly than the single null (SN) or other snowflake (SF) configurations. Pressure profiles at the entrance of the divertor are strongly affected by the position of the secondary X-point and magnetic field between the outer-midplane (OMP) and the divertor entrance enhancing the role of parallel direction indicating the importance of E × B drifts. Pressure drops of up to 50% appear heat convection. The electron temperature and density profiles and the radial turbulent fluxes measured at the OMP are largely unaffected by the changes in divertor geometry, even on flux surfaces where the connection length is infinite.

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Type
research article
DOI
10.1088/1741-4326/abdb93
Author(s)
Tsui, C.K.
Boedo, J.A.
Galassi, D.
Loizu, J.  
Maurizio, R.  
Reimerdes, H.  
Duval, B.P.  
Février, O.
Spolaore, M.
Wensing, M.
Corporate authors
TCV Team
•
Eurofusion MST1 Team
Date Issued

2021-03-02

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

61

Issue

4

Article Number

046004

Subjects

divertor

•

power exhaust

•

scrape-off layer

•

snowflake divertor

•

alternative divertor configuration

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
FunderGrant Number

EU funding

633053

US foundations

DE-SC0010529

Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/175642
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