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Abstract

The phenomenon "detached"-plasma is described and analyzed, based on detailed experimental studies in the TEXTOR Tokamak, in particular by applying comprehensive edge diagnostics. The major parameters responsible for the transition to a "detached"-plasma are identified (heating power, electron density, impurity level) and can be related to a power loss via "100% radiation cooling" from low-Z impurities at the edge. The relevance for plasma-wall interaction, as evidenced e.g. by drastic changes in heat loads to the limiter, increase of particle flux to the wall, thereby enhancing the impurity release, is discussed. The great importance of considering the "detached"-plasma properties in scaling studies and additional heating effects is demonstrated by the impact of this plasma state on particle and energy confinement times and by ICRF heating induced transitions.

Additional information

Authors: SAMM U, KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY);BAY H, KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY);BOGEN P, KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY);HARTWIG H, KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY);HINTZ E, KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY);HOETHKER K, KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY);LIE Y T, KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY);POSPIESZCYZK A, KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY);ROSS G KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY), KERNFORSCHUNGSANLAGE JUELICH GMBH (GERMANY)
Bibliographic Reference: WRITE TO ZENTRALBIBLIOTHEK DER KERNFORSCHUNGSANLAGE JUELICH GMBH, POSTFACH 19 13 D- 5170 JUELICH (GERMANY), MENTIONING REPORT JUEL-2123, 1987
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