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Abstract

Long pulse neutral beam heating experiments with 65 keV hydrogen beams into deuterium plasmas have been performed over a wide range of plasma parameters (q-cyl = 1.7 - 10.5) and beam power (<or=5.5 MW). Impurities did not present a problem. Z-eff slightly decreased with increasing beam power and also during a beam pulse. Plasma radiation closely followed the beam- induced density build-up and stayed at low values, particularly in the case of inner wall plasmas. At medium density the ion temperature was increased from about 2.2 to about 6.5 keV and in excess of the electron temperature. The energy confinement degradation was close to L-mode scaling law predictions. The confinement time at the highest input power and current was tau-E = 0.4 s, tau-E being a weakly increasing function of plasma current, density and toroidal field. The operating regime for beam heated plasmas was much greater than for ohmic or RF heated plasmas. The maximum density increased with input power and with I-p**$9H. A Murakami parameter of 6 x 10**19 m**-2 T**-1 was obtained.

Additional information

Authors: JET TEAM, JET JOINT UNDERTAKING, ABINGDON (UK);DUESING G JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK), MENTIONING REPORT JET-P(86)20, 1986
Record Number: 1989125019700 / Last updated on: 1987-02-01
Category: PUBLICATION
Available languages: en