Systems Approach to Polarization Calibration for the Daniel K. Inouye Solar Telescope (DKIST)

Abstract The Daniel K. Inouye Solar Telescope (DKIST) advances studies of solar magnetism through high-precision and accuracy in polarimetry at frontier spatial temporal scales. A system model for polarization response azimuth altitude has been developed to calibrate DKIST instruments. team several new modeling performance-estimation techniques coupled with thorough metrology. These efforts ensure that quality is delivered meet stringent requirements. custom spectropolarimetric calibration was designed, installed, used perform end-to-end the telescope using beam within Cryo -NIRSP instrument. Extensive optical characterization allow reduction systematic errors a detailed includes elliptical retarders. Coating witness samples every relevant optic have measured. Aperture-dependent variations polarizer, retarder, optic-coating performance measured simulate both dependence on field angle optical-system model. Multiple observations on-Sun lamp agree well each other Upcoming multi-instrument are expected be calibrated understanding major error limitations.