Limiter biasing experiments in TEXTOR-94

T. Loarer; J. Gunn; J. L. Lachambre; E. Gravier; C. Boucher; K. H. Finken; M. Lehnen; G. Mank; S. Jachmich; H. Van Goubergen; G. Van Oost

doi:10.1023/A:1012889916241

Limiter biasing experiments in TEXTOR-94

T. Loarer, J. Gunn, J. L. Lachambre, E. Gravier, C. Boucher, K. H. Finken, M. Lehnen, G. Mank, S. Jachmich, H. Van Goubergen, G. Van Oost

Laboratory for Plasma Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Particle collection by the ALT-II belt limiter in the TEXTOR-94 tokamak is exclusively limited to the parallel outflux because the scoop walls that are oriented parallel to the field lines obstruct the poloidal ExB mass flow. With normal B_tor direction (ExB towards the scoops), a threefold decrease of plenum pressure is measured during negative biasing, while with reversed B_tor (ExB away from the scoops), a 60% pressure increase is observed. This behaviour is exactly opposite to that observed in X-point divertors. A simple fluid model explains this apparent contradiction, and gives good quantitative agreement with measurements of the parallel Mach number in the SOL. The essential physics is governed by the Bohm-Chodura criterion.

Original language	English
Pages (from-to)	1021-1031
Number of pages	11
Journal	Czechoslovak Journal of Physics
Volume	51
Issue number	10
DOIs	https://doi.org/10.1023/A:1012889916241
Publication status	Published - Oct 2001

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title = "Limiter biasing experiments in TEXTOR-94",

abstract = "Particle collection by the ALT-II belt limiter in the TEXTOR-94 tokamak is exclusively limited to the parallel outflux because the scoop walls that are oriented parallel to the field lines obstruct the poloidal ExB mass flow. With normal Btor direction (ExB towards the scoops), a threefold decrease of plenum pressure is measured during negative biasing, while with reversed Btor (ExB away from the scoops), a 60\% pressure increase is observed. This behaviour is exactly opposite to that observed in X-point divertors. A simple fluid model explains this apparent contradiction, and gives good quantitative agreement with measurements of the parallel Mach number in the SOL. The essential physics is governed by the Bohm-Chodura criterion.",

author = "T. Loarer and J. Gunn and Lachambre, \{J. L.\} and E. Gravier and C. Boucher and Finken, \{K. H.\} and M. Lehnen and G. Mank and S. Jachmich and \{Van Goubergen\}, H. and \{Van Oost\}, G.",

year = "2001",

month = oct,

doi = "10.1023/A:1012889916241",

language = "English",

volume = "51",

pages = "1021--1031",

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TY - JOUR

T1 - Limiter biasing experiments in TEXTOR-94

AU - Loarer, T.

AU - Gunn, J.

AU - Lachambre, J. L.

AU - Gravier, E.

AU - Boucher, C.

AU - Finken, K. H.

AU - Lehnen, M.

AU - Mank, G.

AU - Jachmich, S.

AU - Van Goubergen, H.

AU - Van Oost, G.

PY - 2001/10

Y1 - 2001/10

N2 - Particle collection by the ALT-II belt limiter in the TEXTOR-94 tokamak is exclusively limited to the parallel outflux because the scoop walls that are oriented parallel to the field lines obstruct the poloidal ExB mass flow. With normal Btor direction (ExB towards the scoops), a threefold decrease of plenum pressure is measured during negative biasing, while with reversed Btor (ExB away from the scoops), a 60% pressure increase is observed. This behaviour is exactly opposite to that observed in X-point divertors. A simple fluid model explains this apparent contradiction, and gives good quantitative agreement with measurements of the parallel Mach number in the SOL. The essential physics is governed by the Bohm-Chodura criterion.

AB - Particle collection by the ALT-II belt limiter in the TEXTOR-94 tokamak is exclusively limited to the parallel outflux because the scoop walls that are oriented parallel to the field lines obstruct the poloidal ExB mass flow. With normal Btor direction (ExB towards the scoops), a threefold decrease of plenum pressure is measured during negative biasing, while with reversed Btor (ExB away from the scoops), a 60% pressure increase is observed. This behaviour is exactly opposite to that observed in X-point divertors. A simple fluid model explains this apparent contradiction, and gives good quantitative agreement with measurements of the parallel Mach number in the SOL. The essential physics is governed by the Bohm-Chodura criterion.

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DO - 10.1023/A:1012889916241

M3 - Article

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SN - 0011-4626

VL - 51

SP - 1021

EP - 1031

JO - Czechoslovak Journal of Physics

JF - Czechoslovak Journal of Physics

IS - 10

ER -

Limiter biasing experiments in TEXTOR-94

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