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Optical lifetime of the first mirror is a critical issue for the ITER upper port plug core charge exchange spectroscopy diagnostic (cCXRS). A fast shutter is engaged to protect the mirror from depositions between measurements. The prototype shutter will be examined in a test vacuum vessel that is now under development in the Forschungszentrum Jülich, Germany. Being located near the plasma, the shutter...
A second harmonics or dispersion interferometer (DI) is a promising approach for the measurement of line-integrated densities on fusion devices. In contrast to a conventional two-color interferometer, the second harmonics (SH) of an interferometer beam, generated by a non-linear optical crystal, is used as the second probing beam. Since a few years, non-linear crystals with a sufficient conversion...
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