Investigation of first mirror heating for the collective Thomson scattering diagnostic in ITER

Mirko Salewski, Fernando Meo, Henrik Bindslev, Vedran Furtula, Søren Bang Korsholm, Bent Lauritzen, Frank Leipold, Poul Michelsen, Stefan Kragh Nielsen, Erik Nonbøl

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    Collective Thomson scattering (CTS) has the capabilities to measure phase space densities of fast ion populations in ITER resolved in configuration space, in velocity space, and in time. In the CTS system proposed for ITER, probing radiation at 60 GHz generated by two 1 MW gyrotrons is scattered in the plasma and collected by arrays of receivers. The transmission lines from the gyrotrons to the plasma and from the plasma to the receivers contain several quasioptical mirrors among other components. These are designed to produce astigmatic beam patterns in the plasma where the beam shapes will have a direct impact on the signal strength of the diagnostic, the spatial resolution, and the robustness of probe and receiver beam overlap against density excursions. The first mirror has a line of sight to the plasma and is thus exposed to severe neutron streaming. The present neutronics and thermomechanical modeling of a first mirror on the high field side indicates that the mirror curvature may warp due to heating. This may alter the beam quality, and therefore, thermal effects have to be accounted for during the design of the mirror. The modeling further demonstrates that thin mirrors are superior to thick mirrors from a thermomechanical point of view. ©2008 American Institute of Physics
    Original languageEnglish
    JournalReview of Scientific Instruments
    Issue number10
    Pages (from-to)10E729
    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
    Country/TerritoryUnited 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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