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In low density tokamak discharges a considerable amount of runaway electrons with energy up to tens of MeV can be created. As these energetic electrons are effectively collisionless, they follow the magnetic fieldlines and can be used to probe the magnetic turbulence in the core of the plasma. This paper deals with the implications for transport and magnetic turbulence that can be deduced from the synchrotron radiation in these experiments. When a deuterium pellet is injected into the TEXTOR tokamak, a rapid loss of most of the runaway electrons is observed due to the stochastisation of the magnetic field. The remaining electrons form a narrow beam which diffuses away very slowly. The fact that the beam survives the period of stochastic field shows that in the chaotic sea big magnetic islands must remain intact.

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Authors: JASPERS R ET AL., FOM Instituut voor Plasmafysica, Rijnhuizen, Nieuwegein (NL);LOPES CARDOZO N J ET AL., Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Physical Review Letters, Vol. 72 (1994) No. 26, pp. 4093-4096
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