Plasma effects on the particle collection characteristics of the Tore Supra modular pump limiter
The particle collection characteristics of the Tore Supra outboard pump limiter (OPL) are studied in order to assess and understand the effects of the plasma parameters on the performance of the OPL module. The results of two series of experiments, one in plasmas with ohmic heating and one in plasmas with lower hybrid heating, are analysed, and the general trend of the module particle collection is evaluated by studying the OPL conductance parameter in plasmas with various densities, temperatures, heating power, and impurity behaviour. For this study, the contribution from the impurity carbon influx to the OPL is taken into account in estimating the hydrogenic ion particle influx obtained from the Langmuir probes located inside the OPL entrance throat. The results presented here indicate that molecular gas conductance plays the principal role in the particle collection performance of the OPL for local densities up to 4 x 1.0 E12/cm3. This observation is consistent with the fact that the ionisation mean free path of the outstreaming neutrals is comparable to the throat length of the module for the density and the electron temperature available in the throat.
Bibliographic Reference: Report: EUR-CEA-FC-1465 EN (1992) 24 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199211189 / Last updated on: 1994-11-29
Original language: en
Available languages: en