| Name: | Mudit Kumar Srivastava |
| Affiliation: | Physical Research Laboratory, Ahmedabad |
| Conference ID : | ASI2024_636 |
| Title : | Development of ProtoPol – a medium resolution echelle spectro-polarimeter for PRL Telescopes |
| Authors : | Mudit K. Srivastava, Arijit Maiti, Bhavesh Kumar Mistry, Ankita Patel, Vaibhav Dixit, Kevikumar Lad and Vipin Kumar |
| Authors Affiliation: | 1. Mudit K. Srivastava, Arijit Maiti, Bhavesh Kumar Mistry, Ankita Patel, Vaibhav Dixit, Kevikumar Lad (Physical Research Laboratory, Ahmedabad)
2. Vipin Kumar (University of Cologne, Germany) |
| Mode of Presentation: | Poster |
| Abstract Category : | Facilities, Technologies and Data science |
| Abstract : | ProtoPol is the prototype spectro-polarimeter of M-FOSC-EP (Mt. Abu Faint Object Spectrograph and Camera-Echelle Polarimeter) – a two-channel multimode instrument which is currently being designed for PRL 2.5m telescope at Mt. Abu. M-FOSC-EP would provide capabilities of imaging, low resolution (R~500-700) spectroscopy and intermediate resolution (R~15000) spectro-polarimetry in visible wavelengths (382-1000 nm). As a precursor of M-FOSC-EP, ProtoPol was conceived to evaluate the development methodology of M-FOSC-EP with commercially available off-the-shelf components. Similar to M-FOSC-EP, the ProtoPol was designed on the concept of echelle and cross-disperser gratings to record the cross-dispersed spectra in the wavelength range from 390 to 940 nm but with lower resolution (R~7000). The telescope focal plane is mapped on to a 150-microns pinhole inside the instrument which acts as the slit. The incoming beam is then separated in to two orthogonal polarized E and O beams by a polarimeter section which consists of four off-the-shelf achromatic doublet lenses, a Wollaston prism and an achromatic half waveplate. These beams are fed to the spectrometer section consisting of an off-axis parabola as the collimator, an echelle grating and cross-disperser gratings. Two inter-changeable cross-disperser gratings are used for blue and red parts of the spectrum. The final dispersed spectra in multiple orders are then collected by an off-the-shelf Canon make 200mm focal length camera system which is coupled to a commercial ANDOR make off-the-shelf 1K X 1K CCD detector system to record the final spectra. ProtoPol has been fully integrated in the laboratory and is currently being characterized for its performance and other parameters. It is expected to see the first light on the telescope is couple of weeks. In this proposed talk, the speaker shall discuss the design, development methodology, laboratory and on-sky performance of ProtoPol along with some of the perspective science objectives of ProtoPol. |
