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Generation of runaway electrons during disruptions is regarded as a serious problem for future tokamak devices. The number and high energy of these runaways can lead to considerable damage to wall components. In TEXTOR, low density discharges (n(e) less than 1 x 1.0 E19/m3) have been analysed to study the creation mechanism involved and the energy increase in the runaways. The general features of the synchrotron radiation emitted by highly relativistic runaways (greater than 20 MeV) are described, from which the creation rate can be derived. An interesting phenomenon observed at the end of low density ohmic discharges, a rapid increase in the pitch angle (the ratio of perpendicular to parallel velocity) on a time scale of less than 65 microseconds, is discussed. Finally conclusions are drawn on the implications for future tokamak operation.

Additional information

Authors: JASPERS R ET AL., FOM Instituut voor Plasmafysica, Rijnhuizen, Nieuwegein (NL);FINKEN K H ET AL., Forschungszentrum Jülich GmbH (KFA) (DE);BOEDO J A, University of California at Los Angeles, Institute for Plasma and Fusion Research (US)
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. I (1993) pp. 123-126
Record Number: 199311161 / Last updated on: 1994-11-29
Original language: en
Available languages: en