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Abstract

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.

Additional information

Authors: PHILIPPS V, Kernforschungsanlage Jülich GmbH (DE);VIETZKE E, Kernforschungsanlage Jülich GmbH (DE);ERDWEG M, Kernforschungsanlage Jülich GmbH (DE);WAELBROECK F, Kernforschungsanlage Jülich GmbH (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 162-164 (1989), pp. 520-526
Record Number: 199010369 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en