EXPERIENCES OF WALL INTERACTION IN JET
The first year of operation of JET has recently terminated, and the first thorough interior examination has taken place. The work has been carried out jointly by JET staff and a Culham Laboratory team working under a Task Agreement. Erosion features attributed to runaway fast electrons, to unipolar arcs have been identified. Sputtering and evaporation processes are seen and redeposition and cross-examination of elements within the torus are clearly observed. Severe local effects of thermal excursions are seen on protection plates. Detritus recovered from the vacuum vessel includes metallic droplets and films, and fibrous material, probably from clothing. Surface analysis on long term samples, in limiter components and on probes exposed for short periods at selected phases through the pulse have shown that during tokamak operation more material overall is transferred from the main vacuum chamber wall than from the limiters themselves.
Bibliographic Reference: JOURNAL OF NUCLEAR MATERIALS, VOL. 133 & 134 (1985), PP. 18-24
Record Number: 1989124105600 / Last updated on: 1987-01-01
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