LIMITERS AND FIRST WALL ON JET
Of the graphite limiters and Inconel Wall protection plates used the Inconel plates at the inboard wall were found to be somewhat damaged. These plates were replaced by graphite tiles. Operational experience with the graphite tiles has been good, and additional graphite protections have been installed recently. Further protections will be added in 1987. Some of the graphite tiles protect the wall from the power loading of neutral particle beams. The tiles can withstand the expected load due to beamshine-through, but they are cracked by unattenuated beams of long duration. Alternative designs and materials will be tested. By the beginning of 1987, the installation of toroidal belt limiter, made of graphite or beryllium is planned. This limiter, (total area of 15 m**2) should be able to withstand 10 second long pulses with 40 MW of additional heating power injected into the vacuum vessel. The limiter tiles are radiation - cooled by a radiator comprising water cooled fins. A similar design is used for the protection frames around the ICRF heating antennae. It is also planned to use beryllium evaporators in conjunction with the belt limiter, in order to take full advantage of the gettering properties of beryllium. Future plans include operations with a magnetic separatrix requiring the use of a new set of limiters (top and bottom parts of the vessel).
Bibliographic Reference: 11TH SYMPOSIUM ON FUSION ENGINEERING, AUSTIN, TEXAS (USA), NOV. 18-22, 1985 PP. 2-1 $- 2-11 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-P(85)26, 1985
Record Number: 1989125076300 / Last updated on: 1987-12-01
Available languages: en