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During the operation of JET and of any tokamak, many discharges are terminated by a major disruption. The disruptive termination of a discharge is usually an unwanted event which may cause damage to the structure of the vessel. This paper presents statistical information about the disruptions which have occurred at JET over the periods of operation from 1985 to 1990. A database containing data for all these JET disruptions has been created. The structure and contents of this database are described in detail. The first results of the statistical analysis show that disruptions have occurred with a frequency of approximately 20%. However, during long periods of operation, the disruption frequency has been considerably lower. There has not been a single major cause of plasma disruptions. One of the more common causes of disruption has been the reaching of the density limit. Another quite common reason has been disruption during the plasma current decay, which can be associated with an excessive peaking of the current profile, possibly associated with an excessive skin in the plasma current decay.

Additional information

Authors: TANGA A, JET Joint Undertaking, Abingdon, Oxon. (GB);JOHNSON M F, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-R(91)08 EN (1991) 40 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199111623 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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