POWER LOAD AND LIMITER CONSIDERATIONS IN JET
The JET plasma is heated ohmically, by neutral injection (NBI) and by radio waves (ICRH). The "effective" heating power, shown in the table, is assumed to be half of the power put into the torus. The pulse length is about 10s, the total vessel wall is 200 m**2. At low heating power up to 8 single limiters with a total area of 2.6 m**2 will be used. They are covered with radiation cooled carbon tiles or nickel clad on a water cooled structure. At high power levels two toroidally closed belt limiters will be installed, consisting of a water cooled structure holding radiation cooled tiles of carbon or possibly beryllium. The maximum heat load as defined by the permissible surface temperature is given. The safety margin, allowing for non uniform heat load varies between 1 and 2.6. It is expected that the energy of particles impinging on the limiters is rather high (approximately equal 200 eV) at full power even if half of it is radiated. An attempt will be made, therefore, to minimize limiter loads by establishing a cold radiating plasma mantle.
Bibliographic Reference: 4TH INTERNATIONAL SYMPOSIUM ON HEATING IN TOROIDAL PLASMAS, ROMA (ITALY), MARCH 21-28, 1984 VOL. II, P. 1371 1478 P., VOL. I AND VOL. II, 1984 WRITE TO MONOTYPIA FRANCHI, ST. LUCIA - VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO, PERUGIA (ITALY), PRICE: US
Record Number: 1989124036300 / Last updated on: 1987-01-01
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