Partial pressure measurements of the residual gas during and after TEXTOR tokamak discharges
Residual gas analysis has been performed at the wall during and after discharges in the TEXTOR tokamak by a mass spectrometer shielded against magnetic perturbation. The partial pressure of the fuel gas during the discharge lies between 2x1.0 E-7 and 2x1.0 E-6 mbar depending mainly on the plasma density, the limiter configurations and the plasma current. The dominant impurity partial pressures are those of CO and CO(2): they reach values between 0.3-0.5 and 0.1-0.2 respectively of the fuel gas neutral pressure and are closely correlated to the oxygen impurity level in the plasma. Hydro-(deutero-) carbon partial pressures during the discharge have been detected to be 0.04 for CH(4)(CD(4)) and 0.01 for C(2)H(x)(C(2)D(x)) of the H(2)(D(2)) pressure at 150 wall temperature; they increase with increasing wall temperature.
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 162-164 (1989), pp. 520-526
Record Number: 199010369 / Last updated on: 1994-12-01
Original language: en
Available languages: en