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Abstract

The structure of the magnetic equilibrium in the Reversed Field Pinch HBTX1A has been measured using a magnetic probe inserted into the plasma. The picture revealed is one which agrees with a modified Bessel description of the field profiles. Variation of the measured flux surface displacement with radius is consistent with that predicted by toroidal equilibrium theory. Profiles of the safety factor indicate that there is no pitch minimum. Pressure distributions are deduced which appear peaked on axis and are consistent with the measured values of the density and conductivity temperature. Values of B0 = 14% and (B) = 5% are found, leading to an estimation of the energy confinement time of tE = 70 microseconds. Electric field profiles are presented from which a profile of effective parallel conductivity is calculated. This profile differs markedly from that estimated from the pressure profile using Spitzer conductivity, confirming the need for some type of dynamo mechanism and indicating its spatial form.

Additional information

Authors: BROTHERTON RATCLIFFE D, CULHAM LABORATORY, ABINGDON, OXON. (UK);HUTCHINSON I H CULHAM LABORATORY, ABINGDON, OXON. (UK), CULHAM LABORATORY, ABINGDON, OXON. (UK)
Bibliographic Reference: AVAILABILITY: WRITE TO HER MAJESTY'S STATIONERY OFFICE, P.O. BOX 276, LONDON SW8 5DT (UK), MENTIONING REPORT CLM-R 246, 1984, PRICE: UKL 5.00
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