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  4. Enhanced (E)over-right-arrow x (B)over-right-arrow drift effects in the TCV snowflake divertor
 
research article

Enhanced (E)over-right-arrow x (B)over-right-arrow drift effects in the TCV snowflake divertor

Canal, G. P.
•
Lunt, T.
•
Reimerdes, H.
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2015
Nuclear Fusion

Measurements of various plasma parameters at the divertor targets of snowflake (SF) and conventional single-null configurations indicate an enhanced effect of the (E) over right arrow x (B) over right arrow drift in the scrape-off layer of plasmas in the SF configuration. Plasma boundary transport simulations using the EMC3-Eirene code show that the poloidal gradients of the kinetic profiles in the vicinity of the null-point of a SF divertor are substantially larger than those of a conventional single-null configuration. These gradients are expected to drive larger (E) over right arrow x (B) over right arrow flows in the SF divertor and are thought to be responsible for the formation of the double-peaked particle and heat flux target profiles observed experimentally. Experiments in forward and reversed toroidal magnetic field directions further support this conclusion. The formation of such a double-peaked profiles is enhanced at higher plasma densities and may have beneficial effects on the divertor heat loads since they lead to broader target profiles and lower peak heat fluxes.

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Type
research article
DOI
10.1088/0029-5515/55/12/123023
Web of Science ID

WOS:000366534500025

Author(s)
Canal, G. P.
Lunt, T.
Reimerdes, H.
Duval, B. P.
Labit, B.
Vijvers, W. A. J.
Corporate authors
TCV Team
Date Issued

2015

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

55

Issue

12

Article Number

123023

Subjects

snowflake divertor

•

(E)over-right-arrow x (B)over-right-arrow drift

•

edge transport simulations

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
February 16, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/123990
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