Commissioning activities and first results from the collective Thomson scattering diagnostic on ASDEX Upgrade (invited)

Fernando Meo, Henrik Bindslev, Søren Bang Korsholm, Vedran Furtula, F. Leuterer, Frank Leipold, Poul Michelsen, Stefan Kragh Nielsen, Mirko Salewski, J. Stober, D. Wagner, P. Woskov

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    The collective Thomson scattering (CTS) diagnostic installed on ASDEX Upgrade uses millimeter waves generated by the newly installed 1 MW dual frequency gyrotron as probing radiation at 105 GHz. It measures backscattered radiation with a heterodyne receiver having 50 channels (between 100 and 110 GHz) to resolve the one-dimensional velocity distribution of the confined fast ions. The steerable antennas will allow different scattering geometries to fully explore the anisotropic fast ion distributions at different spatial locations. This paper covers the capabilities and operational limits of the diagnostic. It then describes the commissioning activities carried out to date. These activities include gyrotron studies, transmission line alignment, and beam pattern measurements in the vacuum vessel. Overlap experiments in near perpendicular and near parallel have confirmed the successful alignment of the system. First results in near perpendicular of scattered spectra in a neutral beam injection (NBI) and ion cyclotron resonance heating (ICRH) plasma (minority hydrogen) on ASDEX Upgrade have shown evidence of ICRH heating phase of hydrogen. ©2008 American Institute of Physics
    Original languageEnglish
    JournalReview of Scientific Instruments
    Issue number10
    Pages (from-to)10E501
    Publication statusPublished - 2008
    Event17. Topical Conference on High-Temperature Plasma Diagnostics - Albuquerque, NM, United States
    Duration: 11 May 200815 May 2008
    Conference number: 17


    Conference17. Topical Conference on High-Temperature Plasma Diagnostics
    CountryUnited States
    CityAlbuquerque, NM

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    Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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