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Local-density increment from an ablated deuterium pellet in the TFTR tokamak

1991; American Physical Society; Volume: 66; Issue: 24 Linguagem: Inglês

10.1103/physrevlett.66.3140

1092-0145

D.K. Mansfield, A. Janos, D. K. Owens, G. Schmidt, M.G. Bell, A. Cavallo, E. D. Fredrickson, A.T. Ramsey, G. Taylor,

High-pressure geophysics and materials

Details of the process by which ionized pellet ablatant increases the density in a tokamak have been observed for the first time. For mild ablation rates, this process is not simply diffusive. Instead, the ionized ablatant takes the form of a temporally symmetric pulse which propagates over large distances along magnetic-field lines. This pulse has been observed both interferometrically and with an x-ray camera. These observations are not in qualitative agreement with models which predict a steplike densification of the plasma by the pellet.