Additional spectra modes (prism R=22, prism R=49, grism R=278, grism R=981, grism R=1724) were installed in February 2022. MYSTIC is available in the K-band using a low-resolution R=49 prism.
Beams are injected in polarization-maintaining fibers outside the cryogenic dewar and transported through a vacuum feedthrough into the 220K cold volume where combination is achieved and the light is dispersed. The design follows the image-plane combination scheme of the MIRC instrument where single-mode fibers bring starlight into a nonredundant fringe pattern to feed a spectrograph. MYSTIC, the Michigan Young STar Imager at CHARA is a K-band, cryogenic, 6-beam combiner. Contact the instrument team if you are interested in using the J+H mode. The simultaneous J+H mode using 4 telescopes is under development for MIRC-X. A higher resolution grism with R=1170 is available with approval from the instrument team. Three spectral modes are currently available in the H-band: prism R=50 (8 spectral channels), prism R=102, and grism R=190. The combined light passes through a spectrograph and is imaged on the detector. MIRC-X injects the light from each telescope into optical fibers for spatial filtering.The fiber outputs from the six beams are arranged in a linear non-redundant pattern to spatially encode the fringes from each pair of telescopes.
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