First results of the TEXTOR line-of-sight ECE system for ECRH system feedback

J.W. Oosterbeek, E. Westerhof, M.R. Baar, de, M.A. Berg, van den, W.A. Bongers, A. Bürger, M. Graswinckel, R. Heidinger, B.A. Hennen, J. Hoekzema, S. Korsholm, O. Kruijt, B. Lamers, F. Leipold, D.J. Thoen, B.C.E. Vaessen, P. Wortman

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic


A line-of-sight ECE diagnostic has been taken into operation on the TEXTOR tokamak, which views theplasma along the optical path of the high power ECRH beam. Separation of the low power ECE and high powergyrotron radiation is achieved by a Fabry-Pérot filter in the form of a 25.75 mm quartz plate which istransparent to the gyrotron radiation but reflects selected ECE frequencies with a periodicity of 3 GHz. Tests at low and high power show that the system is behaving in accordance with expectations. ECE spectra have been obtained both in the absence and during high power ECRH. These clearly show the potential of identifying the location of magnetic islands or the sawtooth inversion radius. For some launching conditions the measured ECE spectrum is strongly perturbed. The reason for these perturbations is under investigation.
Original languageEnglish
Title of host publication15th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, United States, Yosemite National Park, California
Publication statusPublished - 2008


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