Microwave And Interferometer Diagnostics Prepared For First Plasma Operation Of Wendelstein 7-X

TL;DRAbstract

For the first test operation of W7-X, only a limited set of seven diagnostics is considered to be mandatory. Among these are the Dispersion Interferometer for the electron density measurement and the ECE radiometer. Dispersion Interferometry using a 10.6 m CO 2 -laser and its second harmonic with no need for a reference line is widely independent of mechanical vibrations and drifts and thus developed as a candidate for steady state density control. The 32-channel ECE radiometer probing the electron temperature profile using Gaussian optics and a single broadband mixer is dedicated to track ECRH heating and perform first transport studies. Three reflectometers are being prepared to use the first plasmas for their test operation namely a Doppler reflectometer with an optimized Gauss telescope optics, a Doppler reflectometer with a fast steering antenna with no movable in-vessel parts capable for a fast scan of the turbulence Kspectrum, and a conventional correlation reflectometer probing

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