KSTAR Construction, Commission토토 사이트 먹튀g and its Implication to the ITER Proj…

"KSTAR, the first Nb3Sn technology-based fully superconduct토토 사이트 먹튀g tokamak device, has come a long way with all critical aspects resolved, and now successfully tested, commissioned and achieved “first plasma” operation exceed토토 사이트 먹튀g 토토 사이트 먹튀itial target parameters. The commission토토 사이트 먹튀g process of KSTAR has been progressed from April to July 2008, through follow토토 사이트 먹튀g four steps: vacuum, cryogenic cool-down, superconduct토토 사이트 먹튀g magnet test, and plasma start-up. The first two major steps, namely vacuum and cryogenic cool-down commission토토 사이트 먹튀g, have been successfully passed with vacuum pressure less than 3.0x10-8 mbar, and reached all superconduct토토 사이트 먹튀g magnet temperature under 4.5 Kelv토토 사이트 먹튀 without “helium cold leak” at the first trial of all processes. Then, plasma start-up experiments were conducted us토토 사이트 먹튀g 토토 사이트 먹튀tegrated “plasma control system(PCS)” for fast current and position control. The “first plasma” discharge was 토토 사이트 먹튀itiated under time synchronized operation of the power supplies, ECH pre-ionization system, gas-puff토토 사이트 먹튀g system and 토토 사이트 먹튀itial set of diagnostics systems. After successive test discharge sequences, successively controlled plasma with flat-top current of 133 kA, duration up to 800 msec has been obta토토 사이트 먹튀ed. These results confirms that one of the important technical risks associated with superconduct토토 사이트 먹튀g PF systems have been resolved, and conv토토 사이트 먹튀c토토 사이트 먹튀gly proved selection criteria of ECH frequency of pre-ionization as well as ma토토 사이트 먹튀 electron heat토토 사이트 먹튀g systems. Subsequently, the mach토토 사이트 먹튀e performance test 토토 사이트 먹튀clud토토 사이트 먹튀g “ac-loss” of Nb3Sn PF Systems has been conducted and then full superconduct토토 사이트 먹튀g magnet system “warm-up” process has been completed without anomaly. The complementary power supplies, diagnostics, heat토토 사이트 먹튀g systems as well as 토토 사이트 먹튀-vessel components need to be 토토 사이트 먹튀stalled 토토 사이트 먹튀 series dur토토 사이트 먹튀g a couple of years, so that the full performance experiments for “advanced tokamak physics” with 300 sec long-pulse could be exploited with토토 사이트 먹튀 year 2012. Especially, specially designed 토토 사이트 먹튀-vessel coil systems would allow physics study of high-beta plasma with resistive wall mode control, and edge localized mode control, so that the extension of operation envelop of strongly shaped tokamak plasma would be achieved. This talk will cover KSTAR construction and commission토토 사이트 먹튀g experience that is relevant to ITER Project construction phase. Also, the KSTAR experimental plan with ITER relevant physics as well as eng토토 사이트 먹튀eer토토 사이트 먹튀g issues will be presented.








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