GLOBAL ENERGY CONFINEMENT STUDIES IN OHMICALLY HEATED JET PLASMAS
Systematic scans of the plasma density n have been completed for a large variety of plasma conditions in JET. The toroidal field B, the safety factor q, the elongation K, the major radius R and the minor radius a have all been varied. It is shown that the resulting data set contains two important parametric constraints, one which is a direct consequence of the ohmic heating, relates the electron temperature T-e to the variables n, B, q, K and a further constraint which relates the effective plasma charge Z-eff to the same set of variables. Subject to these constraints, the global energy confinement time tau-epsilon is found to scale as (nB)**1/2 (q) 1/3 R**1.7 x a**1.3 and this empirical scaling is shown to be consistent with low beta collisional transport.
Bibliographic Reference: 12TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA PHYSICS, BUDAPEST (HUNGARY), SEPT. 2-6, 1985 PP. 25-28 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK), MENTIONING REPORT JET-P(85)10, 1985
Record Number: 1989124058400 / Last updated on: 1987-01-01
Available languages: en