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Coating of the walls of TEXTOR with silicon has led to improved tokamak plasma performance. Very low concentrations of C, B, and O are measured. Radiation from silicon is located at the plasma periphery at r/a greater than or equal to 0.75 and decreases with increasing plasma density. Density limits are enhanced by 30 % as compared with boronised conditions; large density gradients and low electron temperatures at the edge (less than 10 eV) are obtained. The improved confinement regimes observed previously at low densities (1.7 x ITER L 89-P scaling) were extended to significantly higher densities in spite of a high radiative power fraction.

Additional information

Authors: WINTER J ET AL., Forschungszentrum Jülich GmbH (KFA) (DE);JACKSON G L, General Atomics, San Diego (US);MESSIAEN A ET AL., Ecole Royale Militaire, Bruxelles (BE)
Bibliographic Reference: Article: Physical Review Letters, Vol. 71 (1993) No. 10, pp. 1549-1552
Record Number: 199311258 / Last updated on: 1994-11-29
Original language: en
Available languages: en