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Abstract

IN RELATING THE DENSITY LAYER SCRAPE-OFF THICKNESS TO D(1), ACCOUNT IS TAKEN OF TWO ASPECTS OF THE JET CONFIGURATION: A) THE POLOIDALLY-VARYING CROSS-SECTION OF PLASMA FLUX TUBES IN THE SCRAPE-OFF LAYER, AND B) THE DIFFERENT LIMITER CONFIGURATIONS - DISCRETE/CONTINUOUS. A THEORETICAL RELATION IS DERIVED FOR THE DENSITY SCRAPE-OFF LENGTH AT THE OUTSIDE MID-PLANE WHEN POLOIDAL VARIATIONS ARE DOMINATED BY CONFIGURATION, RATHER THAN FLUID FLOW EFFECTS. IF THE NORMALISED PITCH OF THE FIELD AT THE LIMITER IS GREATER THAN THE CRITICAL VALUE ALL FIELD LINES PASSING THROUGH THE IDE MID-PLANE STRIKE A LIMITER, HENCE THE SET OF DISCRETE LIMITERS ACTS AS A COMPLETE TOROIDAL (BELT) LIMITER. OTHERWISE THE SCRAPE-OFF LAYER THICKNESS DEPENDS ON THE NUMBER OF RAIL LIMITERS. EDGE MEASUREMENTS MADE BY LANGMUIR PROBES AND LIMITER-VIEWING CAMERAS ARE USED TO DEDUCE EDGE VALUES OF D(1) FOR OHMIC DISCHARGES, OVER A RANGE OF CONDITIONS. GENERALLY THE VALUES ARE FOUND TO BE CLOSE TO INTOR-ALCATOR SCALING.

Additional information

Authors: STANGEBY P C, JET JOINT UNDERTAKING, ABINGDON, UK: UNIVERSITY OF TORONTO, ONTARIO, CANADA;CULHAM LABORATORY, ABINGDON, UK;IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY, LONDON;TAGLE J A, JET JOINT UNDERTAKING, ABINGDON, UK: UNIVERSITY OF TORONTO, ONTARIO, CANADA;CULHAM LABORATORY, ABINGDON, UK;IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY, LONDON;ERENTS S K, JET JOINT UNDERTAKING, ABINGDON, UK: UNIVERSITY OF TORONTO, ONTARIO, CANADA;CULHAM LABORATORY, ABINGDON, UK;IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY, LONDON;LOWRY C JET JOINT UNDERTAKING, ABINGDON, UK: UNIVERSITY OF TORONTO, ONTARIO, CANADA, JET JOINT UNDERTAKING, ABINGDON, UK: UNIVERSITY OF TORONTO, ONTARIO, CANADA;CULHAM LABORATORY, ABINGDON, UK;IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY, LONDON;CULHAM LABORATORY, ABINGDON, UK, JET JOINT UNDERTAKING, ABINGDON, UK: UNIVERSITY OF TORONTO, ONTARIO, CANADA;CULHAM LABORATORY, ABINGDON, UK;IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY, LONDON;IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY, LONDON, JET JOINT UNDERTAKING, ABINGDON, UK: UNIVERSITY OF TORONTO, ONTARIO, CANADA;CULHAM LABORATORY, ABINGDON, UK;IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY, LONDON
Bibliographic Reference: REPORT JET-P(87)-57, 1987, AVAILABILITY: JET, ABINGDON, UK
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