Ion sputtering, evaporation and arcing in DIVA

The article discusses ion sputtering, evaporation, and arcing in axisymmetric divertor tokamak (DIVA) devices. The plasma located in the divertor region simulates the scrape-off plasma of a conventional tokamak. In the experimental setup, electron temperature is 50-60 eV, ion temperature is 60-80 eV...

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Bibliographic Details
Published in:Nuclear fusion 1978-06, Vol.18 (6), p.872-875
Main Authors: Ohasa, K, Maeda, H, Yamamoto, S, Nagami, M, Ohtsuka, H, Kasai, S, Odajima, K, Kimura, H, Sengoku, S, Shimomura, Y
Format: Article
Language:English
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Summary:The article discusses ion sputtering, evaporation, and arcing in axisymmetric divertor tokamak (DIVA) devices. The plasma located in the divertor region simulates the scrape-off plasma of a conventional tokamak. In the experimental setup, electron temperature is 50-60 eV, ion temperature is 60-80 eV, and electron density is 2 x 10 to the 12th/cu cm. An aluminum target of 6 sq cm is located normal to the magnetic field in the divertor. It is found that of the three mechanisms of metal impurity release studied, ion sputtering dominates the quiet phase of the discharge. This phase is characterized by an absence of spikes in the loop voltage and an absence of heat flux concentration toward a specific part of the first wall. A target of honeycomb structure can reduce metal impurity influx by a factor of two.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/18/6/015