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Of all approaches to controlled thermonuclear fusion the tokamak experiments have been most successful. Over the last decade particularly, three large devices have achieved plasma density, n, temperature, T, and energy confinement times, tau(E), in ranges necessary for a fusion reactor plasma. Such maximum values have, however, not yet been obtained simultaneously but only in separate pulses, although the crucial triple product, nTtau(E), has also been improved by several orders of magnitude. Progress in obtaining peaked density profiles with pellet injection has led to high density plasma without disruptions. Serious unsolved problems concern the spoiling of the fusion rates by (nonhydrogenic) impurities, the plasma parameter control over longer periods of time and indeed the plasma heating by fusion alpha-particles (ignition burning). The most urgent technological question refers to the lifetime of the first wall, which is in direct contact with the plasma.

Additional information

Authors: DÜCHS D, JET Joint Undertaking, Abingdon, Oxon. (GB);HELLSTEN T, Alfvén Laboratory, Royal Institute of Technology, Stockholm (SE)
Bibliographic Reference: Report: JET-P(92)88 EN (1992) 24 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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