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Systems design, assembly, integration, and lab testing of WALOP-South Polarimeter

Article scientifique 2024 Anglais

Résumé

Wide-Area Linear Optical Polarimeter (WALOP)-South is the first wide-field and survey-capacity polarimeter in the optical wavelengths. On schedule for commissioning in 2024, it will be mounted on the 1 m SAAO telescope in Sutherland Observatory, South Africa to undertake the PASIPHAE sky survey. PASIPHAE program will create the first polarimetric sky map in the optical wavelengths, spanning more than 2000 square degrees of the southern Galactic region. The innovative design of WALOP-South will enable it to measure the linear polarization (Stokes parameters $q$ and $u$), in a single exposure, of all sources in a field of view (FoV) of $35\times35$ arcminutes-squared in the SDSS-r broadband and narrowband filters between 500-750 nm with 0.1 % polarization accuracy. The unique goals of the instrument place very stringent systems engineering goals, including on the performance of the optical, polarimetric, optomechanical, and electronic subsystems. All the subsystems have been designed carefully to meet the overall instrument performance goals. As of May 2024, all the instrument optical and mechanical subsystems have been assembled and are currently getting tested and integrated. The complete testing and characterization of the instrument in the lab is expected to be completed by August 2024. In this paper, we will present (a) the design and development of the entire instrument and its major subsystems, focusing on the opto-mechanical design which has not been reported before, and (b) assembly and integration of the instrument in the lab and early results from lab characterization of the instrument.

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Maharana, S., Ramaprakash, A., Rajarshi, C., Khodade, P., Joshi, B., Chordia, P., Kohok, A., Anche, R., Modi, D., Kypriotakis, J., Deokar, A., Kinjawadekar, A., Potter, S., Blinov, D., Eriksen, H., Falalaki, M., Gajjar, H., Ghosh, T., Gjerløw, E., Kiehlmann, S., Liodakis, I., Mandarakas, N., Panopoulou, G., Pavlidou, V., Pearson, T., Pelgrims, V., Readhead, A., Skalidis, R., Tassis, K., Uppal, N., Wehus, I. (2024). Systems design, assembly, integration, and lab testing of WALOP-South Polarimeter. https://doi.org/10.1117/12.3016144

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Auteur(s)

Siddharth Maharana Anamparambu N. Ramaprakash Chaitanya Rajarshi Pravin Khodade Bhushan Joshi Pravin A. Chordia Abhay Kohok Ramya M. Anche Deepa Modi John Andrew Kypriotakis Amit V. Deokar Aditya Kinjawadekar Stephen B Potter Dmitry A. Blinov H. K. Eriksen Myrto Falalaki Hitesh Gajjar Tuhin Ghosh Eirik Gjerløw S. Kiehlmann Ioannis Liodakis N. Mandarakas Georgia V. Panopoulou Vasiliki Pavlidou T. J. Pearson Vincent Pelgrims Anthony C. S. Readhead Raphael Skalidis Konstantinos Tassis Namita Uppal Ingunn Kathrine Wehus

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