Detachment evolution on the TCV tokamak

J. R. Harrison; W. A J Vijvers; C. Theiler; B. P. Duval; S. Elmore; B. Labit; B. Lipschultz; S. H M van Limpt; S. W. Lisgo; C. K. Tsui; H. Reimerdes; U. Sheikh; K. H A Verhaegh; M. Wischmeier

doi:10.1016/j.nme.2016.10.020

Detachment evolution on the TCV tokamak

J. R. Harrison^*, W. A J Vijvers, C. Theiler, B. P. Duval, S. Elmore, B. Labit, B. Lipschultz, S. H M van Limpt, S. W. Lisgo, C. K. Tsui, H. Reimerdes, U. Sheikh, K. H A Verhaegh, M. Wischmeier

^*Corresponding author for this work

Physics

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Abstract

Divertor detachment in the TCV tokamak has been investigated through experiments and modelling. Density ramp experiments were carried out in ohmic heated L-mode pulses with the ion ∇B drift directed away from the primary X-point, similar to previous studies . Before the roll-over in the ion current to the outer strike point, C III and D_α emission from the outer leg recede slowly from the strike point toward the X-point, at a rate of ∼2.0 × 10^-19m/m^-3 along the magnetic field as the electron temperature along the leg reduces with increasing density. Around the onset of detachment, the upstream density profile and outer target D_α profiles broaden, possibly leading to an increase in radiation in the SOL by increased interaction between the SOL and the carbon tiles lining the outer wall. The plasma conditions upstream and at various locations along the detached outer divertor leg have been characterised, and the consistency of this data has been checked with the interpretive OSM-EIRENE-DIVIMP suite of codes and are broadly found to be consistent with measured D_γ/D_α emissivity profiles along the detached outer divertor leg.

Original language	English
Journal	Nuclear Materials and Energy
Early online date	24 Dec 2016
DOIs	https://doi.org/10.1016/j.nme.2016.10.020
Publication status	E-pub ahead of print - 24 Dec 2016

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10.1016/j.nme.2016.10.020

Detachment evolution on the TCV tokamak
© 2016 Published by Elsevier Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy
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title = "Detachment evolution on the TCV tokamak",

abstract = "Divertor detachment in the TCV tokamak has been investigated through experiments and modelling. Density ramp experiments were carried out in ohmic heated L-mode pulses with the ion ∇B drift directed away from the primary X-point, similar to previous studies . Before the roll-over in the ion current to the outer strike point, C III and Dα emission from the outer leg recede slowly from the strike point toward the X-point, at a rate of ∼2.0 × 10-19 m/m-3 along the magnetic field as the electron temperature along the leg reduces with increasing density. Around the onset of detachment, the upstream density profile and outer target Dα profiles broaden, possibly leading to an increase in radiation in the SOL by increased interaction between the SOL and the carbon tiles lining the outer wall. The plasma conditions upstream and at various locations along the detached outer divertor leg have been characterised, and the consistency of this data has been checked with the interpretive OSM-EIRENE-DIVIMP suite of codes and are broadly found to be consistent with measured Dγ/Dα emissivity profiles along the detached outer divertor leg.",

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AU - Vijvers, W. A J

AU - Theiler, C.

AU - Duval, B. P.

AU - Elmore, S.

AU - Labit, B.

AU - Lipschultz, B.

AU - van Limpt, S. H M

AU - Lisgo, S. W.

AU - Tsui, C. K.

AU - Reimerdes, H.

AU - Sheikh, U.

AU - Verhaegh, K. H A

AU - Wischmeier, M.

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Detachment evolution on the TCV tokamak

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