Name: Mudit Srivastava
Affiliation: Physical Research Laboratory, Ahmedabad
Conference ID : ASI2022_492
Title : Designs of Mt. Abu faint object spectrograph and camera - Echelle Polarimeter (MFOSC-EP) and its prototype for PRL telescopes
Authors : Vipin Kumar, Mudit K. Srivastava, Vaibhav Dixit, Bhavesh Mistry, Kevikumar Lad, Ankita Patel, and Arvind S. Rajpurohit (Physical Research Laboratory, Ahmedabad)
Abstract Type: Poster
Abstract Category : Instrumentation and Techniques
Abstract : Mt. Abu Faint Object Spectrograph and Camera-Echelle Polarimeter (MFOSC-EP) is an instrument currently under design for the upcoming PRL 2.5m telescope at Mt. Abu. The instrument is being designed to provide the functionalities of seeing limited imaging and low-resolution spectroscopy (R~500-700) using grisms in addition to the capabilities of an intermediate resolution spectro-polarimeter (resolutions ~ 16000) in the visible wavelength range (382-1000 nm). MFOSC-EP is being designed with a modular optical system, where a common collimator optics is coupled with two separate optical arms having two separate detector systems for the above two modes. As a precursor of MFOSC-P, a prototype spectro-polarimeter (named ProtoPol) has also been designed. This prototype instrument can be used on the existing 1.2m PRL telescope as well as on the upcoming 2.5m PRL telescope with suitable mechanical interfaces. ProtoPol has been designed with off-the-shelf optical and mechanical components, making the design cost-effective. It covers the optical wavelength range from 381 to 977 nm on off-the-shelf 1024X1024 back-illuminated CCD at resolutions of ~8500 with 1.0 arc-second slit width on the 2.5m telescope. It also works on the concept of an echelle grating and two plane reflection gratings as the cross-dispersers, similar to the MFOSC-EP instrument. We have completed the optical design of the MFOSC-P instrument and the optical/opto-mechanical design of the ProtoPol. The mechanical parts of the ProtoPol are currently being fabricated, and components are being procured. Here we shall present the completed optical/opto-mechanical designs of the MFOSC-EP and ProtoPol instruments, along with their design analysis. The performance of the instruments is being evaluated with the science simulations. These simulation results shall also be presented.