Binospec is an imaging spectrograph with dual 8’x15’ fields of view, and a very compact layout for excellent stability. It will be installed on the 6.5 meter MMT telescope in Arizona. The instrument was designed by Daniel Fabricant’s group at the Smithsonian Astrophysical Observatory (SAO). Our lab is involved with the calibration portion of the instrument. Based on a design by SAO, we are fabricating and assembling the retractable calibration screen and derotator assembly.
The role of the calibration screen assembly is to project light from calibration lamps on a rear projection screen that then illuminates the focal plane of the spectrometer uniformly. This allows the user to perform wavelength and flat calibration of the science detectors. The calibration system is integrated to the instrument and the calibration screen is on rails and can be moved in and out of the optical path to allow calibration without having to move the telescope or close the dome.
For more information, visit the Binospec page at the Harvard-Smithsonian Center for Astrophysics.