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We present a cryogenic configurable slit unit (CSU) for a multi objectinfrared spectrograph with an effective field of view of 9.1 arcmin x 9.1arcmin that was completely conceived and designed in the laboratory at TIFR.Several components of the CSU including the controller for the commerciallyprocured piezo-walkers, controlled loop position sensing mechanism usingdigital slide callipers and a cryogenic test facility for the assembledprototype were also developed in-house. The principle of the CSU involvesdivision of the field of view of the spectrometer into contiguous and parallelspatial bands, each one associated with two opposite sliding metal bars thatcan be positioned to create a slit needed to make spectroscopic observations ofone astronomical object. A three-slit prototype of the newly designed CSU wasbuilt and tested extensively at ambient and cryogenic temperatures. Theperformance of the CSU was found to be as per specifications.

A compact cryogenic configurable slit unit for a multi-object infrared spectrograph:Design and Development of a prototype at TIFR