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research article

Results from recent detachment experiments in alternative divertor configurations on TCV

Theiler, C
•
Lipschultz, B
•
Harrison, J
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2017
Nuclear Fusion

Divertor detachment is explored on the TCV tokamak in alternative magnetic geometries. Starting from typical TCV single-null shapes, the poloidal flux expansion at the outer strikepoint is varied by a factor of 10 to investigate the X-divertor characteristics, and the total flux expansion is varied by 70% to study the properties of the super-X divertor. The effect of an additional X-point near the target is investigated in X-point target divertors. Detachment of the outer target is studied in these plasmas during Ohmic density ramps and with the ion gradB drift away from the primary X-point. The detachment threshold, depth of detachment, and the stability of the radiation location are investigated using target measurements from the wall-embedded Langmuir probes and two-dimensional CIII line emissivity profiles across the divertor region, obtained from inverted, toroidally-integrated camera data. It is found that increasing poloidal flux expansion results in a deeper detachment for a given line-averaged density and a reduction in the radiation location sensitivity to core density, while no large effect on the detachment threshold is observed. The total flux expansion, contrary to expectations, does not show a significant influence on any detachment characteristics in these experiments. In X-point target geometries, no evidence is found for a reduced detachment threshold despite a 2â 3 fold increase in connection length. A reduced radiation location sensitivity to core plasma density in the vicinity of the target X-point is suggested by the measurements.

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Type
research article
DOI
10.1088/1741-4326/aa5fb7
Web of Science ID

WOS:000398746200001

Author(s)
Theiler, C
Lipschultz, B
Harrison, J
Labit, B
Reimerdes, H
Tsui, C
Vijvers, W A J
Duva, B P
Elmore, S
Innocente, P
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Corporate authors
TCV Team; EUROfusion MST1 Team
Date Issued

2017

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

57

Article Number

072008

Subjects

detachment

•

alternative divertors

•

X-divertor

•

super-X divertor

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X-point target divertor

•

spc_edge

URL

URL

https://crpplocal.epfl.ch/pinboard/jpapers/1603304.pdf
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
March 22, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/135647
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