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Evidence supporting fluctuations as the source of anomalous transport is presented, emphasising inconsistencies between experiment and present understanding of the transport mechanisms. The measured density fluctuations are generally consistent with prediction for the trapped electron and eta(i) modes. In some tokamaks a correlation is observed between confinement and the density or magnetic fluctuations, but in those cases where quantitative comparison has been made, the fluctuation level is generally too low to produce the measured transport. The implication of the observed particle pinch and the evolution of transient perturbations is examined. It is concluded that the evidence for fluctuations as the main source of transport is not so strong that the search for other possible loss mechanisms should be neglected.

Additional information

Authors: STRINGER T E, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(90)15 EN (1990) 46 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199011303 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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