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Abstract

THIS PAPER DESCRIBES ENERGY CONFINEMENT PROPERTIES OBSERVED IN ASDEX AT LOW AUXILIARY HEATING POWER IN THE TRANSITIONAL RANGE FROM OHMIC HEATING TO THE L-REGIME. MOST OF THE RESULTS WERE OBTAINED FROM NEUTRAL INJECTION (NI) HEATING. THE CRUCIAL ASPECTS ARE BACKED BY RESULTS OBTAINED ALTERNATIVELY WITH ION CYCLOTRON RESONANCE HEATING (ICRH). THE ROLES OF THE EXTERNAL PARAMETERS IN CONFINEMENT UNDER OHMIC AND AUXILIARY HEATING CONDITIONS IS OUTLINED, PARTICULARLY THE HEATING POWER AND PLASMA CURRENT. HEATING POWER LEADS TO THE KNOWN DEGRADATION OF CONFINEMENT, WHILE HIGH PLASMA CURRENT IMPROVES IT. EXPERIMENTS ARE DESCRIBED IN WHICH THE LOCAL HEATING POWER WAS VARIED LEADING TO LOCAL CHANGES OF MA CONFINEMENT. THE SCALING OF THE CONFINEMENT TIME WAS STUDIED IN THE IMMEDIATE POWER RANGE. THE POWER DEGREE IS DESCRIBED BY A OFF-SET-LINEAR RELATION. THE REMAIN DENSITY DEPENDENCE OF THE GLOBAL ENERGY CONFINEMENT TIME IS INTRODUCED VIA THE ENERGY OF THE OHMIC TARGET PLASMA. THE INCREMENTAL CONFINEMENT TIME IS FOUND TO INCREASE LINEARLY WITH THE PLASMA CURRENT AND ALSO DEPENDS ON THE ISOTOPE MASS. FINALLY THE ELECTRON TEMPERATURE AND ITS GRADIENT ARE STUDIED. THEIR POWER INCREASE COULD BE RESPONSIBLE FOR THE DEGRADING OF CONFINEMENT.

Additional information

Authors: WAGNER F MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, MUENCHEN, D, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, MUENCHEN, D
Bibliographic Reference: REPORT IPP-III/131, 1988, AVAILABILITY: MAX-PLANCK-INSTITUT, 8046-GARCHING BEI MUENCHEN, D
Record Number: 1989126229400 / Last updated on: 1989-04-01
Category: PUBLICATION
Available languages: en