Author:
Hirsch Matthias,Höfel Udo,Oosterbeek Johan Willem,Chaudhary Neha,Geiger Joachim,Hartfuss Hans-Jürgen,Kasparek Walter,Marushchenko Nikolai,van Milligen Boudewijn,Plaum Burkhard,Stange Torsten,Svensson Jakob,Tsuchiya Hayato,Wagner Dietmar,McWeir Gavin,Wolf Robert,
Abstract
The ECE diagnostic at W7-X in its standard mode of operation measures in X2 mode polarization with a 32 channel radiometer in the frequency band around 140 GHz for central magnetic field 2.5T. The radiometer is calibrated by a noise source and the overall system absolutely calibrated by means of a hot-cold source placed outside the torus in front of a Gaussian telescope optics with identical geometry and transmission line as it is installed for the measurements in the plasma vessel. The system is supplemented with a 16 channel zoom device with 4 GHz span for higher frequency resolution at a suitable radial range and a Michelson interferometer for the characterization of higher harmonics sharing the same line of sight.
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