Simulation of a Double/Triple-Fabry-Perot-Spectropolarimeter for the solar telescope DKIST

The upcoming 4m telescope DKIST on Hawaii is in the developing phase under the leadership of the National Solar Observatory (NSO, USA) and will become the worlds biggest instrument for solar observations. In order to achieve high resoluted images of the solar surface to study their small scale dynamics, we need suitable post-focus instruments which meet the physical requirements. The Kiepenheurer-Institut develops a Fabry-Perot based spectropolarimeter (visible tunable filter, VTF) in telecentric mount for the DKIST to get 2d spectral, polarimetric and spatial high resoluted images of the sun. We carried out simulations for a tandem- and triple-etalon-system to study the impact of instrumental imperfections. In particular it is a study of the quality of the plates and the gaps within the etalons and their influence on MHD-simulations of the quiet sun. Furthermore we studied the impact of noise and image distortions within the simulations to enhance data calibration techniques and define the limits for science data acquisition with this instrument.