Analysis of the stainless steel limiter and of shields of the wasaprobe after operation in T-10

Hildebrandt, D.; Hintze, W.; Jüttner, B.; Laux, M.; Lingertat, J.; Pech, P.; Reiner, H.‐D.; Strusny, H.; Wolff, H.

doi:10.1016/0022-3115(80)90340-2

Cited by 19 publications

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“…A detailed comparison of the number of tracks also showed that more arc initiations occurred on the ion side. The same results were also obtained in some other tokamaks [10,11]. There is no chance for runaway electrons to directly trigger the ignition of arcing because they hit the electron side of the sample.…”

Section: Resultssupporting

confidence: 78%

Plasma parameters related to arc initiation on the tokamak first wall

et al. 1982

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The mechanism responsible for the initiation of unipolar arcs on the tokamak first wall is studied by measuring plasma parameters in the scrape-off layer. It is shown that a large electric field in the sheath region produced by runaway electrons is the dominant cause of the arc initiation. The difference in arc frequency in the toroidal direction on the limiter surface is explained by an asymmetry of the ion flux due to ion drift motion.

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Section: Resultssupporting

confidence: 78%

Plasma parameters related to arc initiation on the tokamak first wall

et al. 1982

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“…There is a variety of deposition 'probes', e.g. post-mortem analysis of portions of limiters [378][379][380] and walls [381,382], etc., longterm samples fixed to the walls [379,383,384], removable probes which integrate over several discharges [196,[385][386][387][388][389][390][391], removable probes which integrate over a complete single discharge [392,393], and probes which time-resolve during a single discharge [394][395][396][397][398][399][400][401][402][403][404][405][406][407]. The extensive literature on deposition probes was recently reviewed by Zuhr et al [377], by Taglauer [408] and by Staudenmaier [409].…”

Section: Measurements Of Impurity Influx and Outfluxmentioning

confidence: 99%

Plasma boundary phenomena in tokamaks

1990

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On the Motion of Unipolar Arcs in a Tokamak

Hintze¹,

Laux²

1981

Contrib Plasma Phys

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Tracks of unipolar arcs found on parts of the T-10 tokamak (shield and pipe section of the siirface analysis station IVASA, edge of the movable limiter) are analyzed.I t is the aim of this paper to explain the observed deviations of the arc motion from the first order retrograde direction. It is shown thnt the drift of the arc which occurs if the magnetic field is inclined to the cathode surface, and which was studied in detail by ROBSOX [ 11, causes the deviations. To this end, arc trncks on three differently shaped electrodes (cone, cylinder, sphere) are calculated theoretically and compared with the data from T-10. Good agreement is obtained if the drift angle is approximately equal to one half of the inclination angle of the mngnetic field. The present investigation is consistent with the model of retrograde arc motion of ROBSOS and VON ENQEL [2, 31.

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Analysis of the stainless steel limiter and of shields of the wasaprobe after operation in T-10

Cited by 19 publications

References 0 publications

Plasma parameters related to arc initiation on the tokamak first wall

Plasma parameters related to arc initiation on the tokamak first wall

Plasma boundary phenomena in tokamaks

On the Motion of Unipolar Arcs in a Tokamak

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