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research article

Effect of the limiter position on the scrape-off layer width, radial electric field and intrinsic flows

Loizu, J.
•
Ricci, P.
•
Halpern, F. D.
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2014
Nuclear Fusion

The effect of the limiter position on the scrape-off layer (SOL) width, radial electric field and intrinsic flows is investigated via global, three-dimensional turbulence simulations in four different limiter configurations. The limiter position affects the SOL dynamics in a number of ways, for example by changing the effective connection length or by modifying the unstable modes present in the system. The simulations show that the SOL width is much smaller and less poloidally asymmetric when the plasma is limited on the low-field side than on the high-field side, which can be explained by a change in the turbulence regime between the two configurations. The radial electric field is determined by the combined effect of the sheath physics and the electron adiabaticity condition, and its poloidal structure depends on the limiter position, as it can be fairly well explained through an analytical model. Intrinsic parallel flows established in the SOL, typically leading to co-current toroidal rotation with a magnitude that strongly depends on the limiter position, can also be fairly well reproduced analytically for each limiter configuration.

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Type
research article
DOI
10.1088/0029-5515/54/8/083033
Web of Science ID

WOS:000339991600037

Author(s)
Loizu, J.
Ricci, P.
Halpern, F. D.
Jolliet, S.
Mosetto, A.
Date Issued

2014

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

54

Issue

8

Article Number

083033

Subjects

CRPP_EDGE

Editorial or Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Available on Infoscience
July 25, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/105241
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