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Abstract

On attachment from GA Technologies Inc., USA, scaling studies of global energy confinement time have been carried out for various conditions on JET. Plasma density n, toroidal field B-T, safety factor q, major radius R and minor radius a have all been varied for ohmic plasmas. The global energy confinement time tau-E is found to scale as (nB-T)**1/2-q**1/3R**1.7a**1.3. In ICRF experiments, deuterium plasmas have been heated by 3He and H minority heating schemes. If the power radiated by the antenna is fully absorbed by the plasma, then the global energy confinement time tau-E deteriorates with rf heating power. The tau-E, however, improves with both plasma current I-p and toroidal field B-T, its scaling being approximately described by tau-E varies as P**1/2-/total I-p**1/2- B-T**1/2-, which is similar to the well known L mode scaling of neutrally heated plasmas, particularly in its power dependence. Comparisons with the L mode scaling of smaller tokamaks are made to determine the scaling of tau-E with plasma dimensions.

Additional information

Authors: EJIMA S, JET JOINT UNDERTAKING, ABINGDON (UK);BURES M, JET JOINT UNDERTAKING, ABINGDON (UK);CHRISTIANSEN J P, JET JOINT UNDERTAKING, ABINGDON (UK);CORDEY J G, JET JOINT UNDERTAKING, ABINGDON (UK);JACQUINOT J, JET JOINT UNDERTAKING, ABINGDON (UK);LALLIA P P, JET JOINT UNDERTAKING, ABINGDON (UK);THOMSEN K JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: 27TH ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS, SAN DIEGO (USA), NOV. 4-8, 1985 PAPER 6P53, PROCEEDINGS P.1525
Record Number: 1989124130100 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en