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Abstract

The main objectives of the experiments described are (i) to compare the global confinement characteristics of separatrix and limiter discharges and (ii) to study the conditions for the creation of a high density, highly radiative, cool plasma region near the X-point capable of screening and isolating the bulk plasma. Compared to similar limiter discharges, the thermal energy content of single null X-point discharges (SN) is roughly a factor of two higher. Plasmas with even modest separation between X-point and target plates show typical signatures of H-mode discharges. Multichannel infrared interferometer measurements provide evidence of the formation of a high density diverted plasma with average density about 10**20m**-3, an order of magnitude higher than the main plasma. Measurements with a bolometer camera array show that, in high density discharges with additional power, up to 40% of the input power is radiated within a about 0.2x0.2m**2 toroidal region around the torus.

Additional information

Authors: TANGA A, JET JOINT UNDERTAKING, ABINGDON (UK);ET. AL JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: 11TH INTERNATIONAL CONFERENCE ON PLASMA PHYSICS AND CONTROLLED NUCLEAR FUSION RESEARCH, KYOTO (JAPAN), NOV. 13-20, 1986 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON OX14 3EA (UK), MENTIONING REPORT JET-P(86)44, 1986
Record Number: 1989125075900 / Last updated on: 1987-12-01
Category: PUBLICATION
Available languages: en