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The behaviour of the material ablated from the wall in a hard disruption is analysed, in order to ascertain its ability to protect the wall from more severe damage. The investigation is limited to the fast first phase of the disruption, during which most of the bulk plasma thermal energy is spilled off. Within the ablated material an interaction region and a transmission region are defined. The bulk plasma thermal energy is dumped in the first region (the virtual limiter) and the associated kinetic energy flux is changed to radiation flux. The radiative energy flux is significantly attenuated in the second region (the plasma shield), preventing more serious injury to the solid wall. The whole problem is investigated in terms of a simplified mathematical model, which is shown to have a similarity solution. By making further approximations, a solution is derived in full analytical terms. Results are applied to ITER and IGNITOR-type tokamaks.

Additional information

Authors: SESTERO A, ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Report: RT/ERG/FUS/93/01 EN (1993) 53 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
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