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Status of PEM-based Polarimetric MSE Development at KSTAR
고진석,정진일,Seung Tae Oh,고원하,Maarten de Bock,Henry Ong,Guido Lange 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
A multi-chord PEM (photo elastic modulator)-based polarimetric motional Stark effect (MSE)system is under development for the KSTAR tokamak. The conceptual design for the front opticswas optimized to preserve not only the polarization state of the input light for the MSE measurementsbut also the signal intensity of the existing charge exchange spectroscopy (CES) system thatwill share the front optics with the MSE. The optics design incorporates how to determine thenumber of channels and the number of fibers for each channel. A dielectric coating will be appliedon the mirror to minimize the relative reflectivity and the phase shift between the two orthogonalpolarization components of the incident light. Lenses with low stress-birefringence constants will beadopted to minimize non-linear and random changes in the polarization through the lenses, whichis a trade-off with the rather high Faraday rotation in the lenses because the latter effect is linearand can be relatively easily calibrated out. Intensive spectrum measurements and their comparisonswith the simulated spectra are done to assist the design of the bandpass filter system that will alsouse tilting stages to remotely control the passband. Following the system installation in 2014, theMSE measurements are expected to be performed during the 2015 KSTAR campaign.