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Abstract

In the scrape-off layer of the Joint European Torus [P-H. Rebut, R. J. Bickerton, and B. E. Keen, Nucl. Fusion 25, 1011 (1985)], Langmuir probes were used to measure the correlation of ion saturation current fluctuations parallel to the magnetic field B. It was possible to realise three different probe tip separations (connection lengths) parallel to the magnetic field B under almost identical plasma conditions and magnetic configuration. Among these, a probe tip separation of 66 m parallel to the magnetic field B represents the largest value ever realised for this type of experiment. It was found that the correlation is reduced from at least 80% at 0.75 m probe tip separation parallel to the magnetic field B in the divertor to approximately 40% at 23 m, but remains at approximately 40% even for the 66 m separation. An upper limit for the ratio between the average wave numbers parallel and perpendicular to the magnetic field <0.0022 is found, but the results are in good agreement with a parallel wave number equal to zero.

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Additional information

Authors: THOMSEN H, Max-Planck�Institut für Plasmaphysik, EURATOM Association, Greifswald (DE);ENDLER M, Max-Planck�Institut für Plasmaphysik, EURATOM Association, Greifswald (DE);BLEUEL J, Max-Planck�Institut für Plasmaphysik, EURATOM Association, Greifswald (DE);CHANKIN A V, UKAEA Fusion, EURATOM Association, Abingdon (GB);ERENTS S K, UKAEA Fusion, EURATOM Association, Abingdon (GB);MATTHEWS G F and contributors to the EFDA-JET workprogramme, UKAEA Fusion, EURATOM Association, Abingdon (GB)
Bibliographic Reference: An article published in: Physics of Plasmas -- April 2002 -- Volume 9, Issue 4, pp. 1233-1240
Record Number: 200214763 / Last updated on: 2002-05-22
Category: PUBLICATION
Original language: en
Available languages: en