Particles pumping in TORE SUPRA
TORE SUPRA and its peripheral equipment is provided with routine clean high vacuum by turbomolecular pumping. During plasma discharges large quantities of very hot gases at the plasma edge and in the scrape-off layer have to be controlled before they violently strike the solid wall, causing an increase in impurities content and raising the density to disruptive level. A Magnetic Ergodic Divertor, made of six winding structures (MED), six Vertical Pumped Limiters (VPL) and one Horizontal Pumped Limiter (HPL), is set in the vacuum chamber in order to cope with plasma-wall interactions and neutral gas recycling. Each is equipped at the front with a thermal shield, made respectively of polycrystalline and pyrolitic graphite bolted on a stainless steel support for MED and HPL and CFC Aerolor 05 brazed on hardened copper for VPL. The total heat removal capacity of these plasma facing components is 12 MW. The capture efficiency of particle collectors and ducts being 10%, for TORE-SUPRA a flux of 3 x 1.0 E21 particles/second has to be absorbed by water cooled titanium getter pumps at the rear. Preliminary results show that particle collection and heat removal were effective and that plasma behaviour was not disturbed by this equipment; instead a tendency to improvement was observed.
Bibliographic Reference: Paper presented: 11ème Congrès Internationale du Vide, Köln (DE), Sept. 25-29, 1989
Availability: Available from (1) as Paper EN 35014 ORA
Record Number: 198911216 / Last updated on: 1994-12-01
Original language: en
Available languages: en