POWER EXHAUST AND PLASMA - WALL INTERACTION IN NET - INTOR
Both a (single-null) poloidal divertor and a pumped limiter are considered. In both cases, operating a high recycling regime is advantageous in minimizing erosion of the plates. In the divertor case it appears possible to exhaust about 80 MW onto the divertor plates; using tungsten brazed on copper for the divertor plates appears to be a possibility. The effective width of the power exhaust channel is anticipated to be narrow. Low and medium-Z divertor plate materials are unsuitable due to sputtering unless more power is exhausted by radiation. In the case of a limiter, only a fraction of the power can be exhausted via the plate, perhaps 20 %, possibly except for low-Z limiters with, however, sputtering. Both divertor and limiter solution require a better experimental data base and further analysis to determine feasibility limits and optimum conditions. Important issues to be elucidated include particle migration (redeposition of sputtered material; plasma contamination and acceptability of high-Z divertor plates), the viability of a strongly radiating plasma edge and impact of fluctuations of the magnetic configuration on the power deposition profile. Moreover, the impact on the exhaust system and on plasma - wall interaction of providing effective pumping for helium exhaust must be better quantified.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. II, PP. 1376-1377 1478 P., VOL. I AND VOL. II, 1984 WRITE TO MONOTYPIA FRANCHI, ST. LUCIA - VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO, PERUGIA (ITALY), PRI
Record Number: 1989124042700 / Last updated on: 1987-01-01
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