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Abstract

In quasi-steady tokamak operation, active control of recycling is achieved by pumping a fraction of the plasma outflux with pump limiters. There are two ways to optimise the efficiency of this apparatus: either to act on the properties of the plasma SOL, or to improve the particle collection with the help of the throat leading from the nozzle to the neutralizer plate. This reduces the amount of escaping neutrals owing to plasma-neutral-sidewall interaction. In this paper, the characteristic lengths of this effect are derived. The neutral density build-up of pump limiters with a long throat (for a large ratio length L over the transverse dimension) is computed.

Additional information

Authors: GHENDRIH P, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);GROSMAN A, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);SAMAIN A, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);CAPES H, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);MORERA J P, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17 1989
Availability: Available from (1) as Paper EN 34457 ORA
Record Number: 198910807 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en
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