Research output: Contribution to conference › Paper › peer-review
Systems design, assembly, integration and lab testing of WALOP-South Polarimeter. / Maharana, S.; Ramaprakash, A.N.; Rajarshi, C.; Khodade, P.; Joshi, B.; Chordia, P.; Kohok, A.; Anche, R.M.; Modi, D.; Kypriotakis, J.A.; Deokar, A.; Kinjawadekar, A.; Potter, S.B.; Blinov, D.; Eriksen, H.K.; Falalaki, M.; Gajjar, H.; Ghosh, T.; Gjerløw, E.; Kiehlmann, S.; Liodakis, I.; Mandarakas, N.; Panopoulou, G.V.; Pavlidou, V.; Pearson, T.J.; Pelgrims, V.; Readhead, A.C.S.; Skalidis, R.; Tassis, K.; Uppal, N.; Wehus, I.K.; J.J., Bryant (Editor); K., Motohara (Editor); J.R., Vernet (Editor); (SPIE), City of Yokohama; Japan National Tourism Organization (JNTO); National Astronomical Observatory of Japan (NAOJ); National Institute of Information and Communications Technology (NICT); The Society of Photo-Optical Instrumentation Engineers.
2024. 292 Paper presented at Ground-Based and Airborne Instrumentation for Astronomy X 2024.Research output: Contribution to conference › Paper › peer-review
}
TY - CONF
T1 - Systems design, assembly, integration and lab testing of WALOP-South Polarimeter
AU - Maharana, S.
AU - Ramaprakash, A.N.
AU - Rajarshi, C.
AU - Khodade, P.
AU - Joshi, B.
AU - Chordia, P.
AU - Kohok, A.
AU - Anche, R.M.
AU - Modi, D.
AU - Kypriotakis, J.A.
AU - Deokar, A.
AU - Kinjawadekar, A.
AU - Potter, S.B.
AU - Blinov, D.
AU - Eriksen, H.K.
AU - Falalaki, M.
AU - Gajjar, H.
AU - Ghosh, T.
AU - Gjerløw, E.
AU - Kiehlmann, S.
AU - Liodakis, I.
AU - Mandarakas, N.
AU - Panopoulou, G.V.
AU - Pavlidou, V.
AU - Pearson, T.J.
AU - Pelgrims, V.
AU - Readhead, A.C.S.
AU - Skalidis, R.
AU - Tassis, K.
AU - Uppal, N.
AU - Wehus, I.K.
AU - (SPIE), City of Yokohama; Japan National Tourism Organization (JNTO); National Astronomical Observatory of Japan (NAOJ); National Institute of Information and Communications Technology (NICT); The Society of Photo-Optical Instrumentation Engineers
A2 - J.J., Bryant
A2 - K., Motohara
A2 - J.R., Vernet
N1 - Код конференции: 202825 Export Date: 21 October 2024 CODEN: PSISD Адрес для корреспонденции: Maharana, S.; South African Astronomical Observatory, PO Box 9, Observatory, South Africa; эл. почта: siddharth@saao.ac.za Адрес для корреспонденции: Ramaprakash, A.N.; Inter-University Centre for Astronomy and Astrophysics, Post bag 4, Ganeshkhind, India; эл. почта: anr@iucaa.in
PY - 2024/6/14
Y1 - 2024/6/14
N2 - 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. In a single exposure, WALOP-South's innovative design will enable it to measure the linear polarization (Stokes parameters q and u) of all sources in a field of view (FoV) of 35 × 35 arc-minutes-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. In particular, the major technical hurdles for the project included the development of: (a) an optical design to achieve imaging quality PSFs across the FoV, (b) an optomechanical design to obtain high accuracy optical alignment in conjugation with minimal instrument flexure and stress birefringence on optics (which can lead to variable instrumental polarization), and (c) an on-sky calibration routine to remove the strong polarimetric cross-talk induced instrumental polarization to obtain 0.1% across the FoV. 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. While the instrument was initially scheduled for commissioning in 2022, it got delayed due to various technical challenges; WALOP-South is now on schedule for commissioning in second half of 2024. In this paper, we will present (a) the design and development of the entire instrument and its major subsystems, focusing the instrument's 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's optical performance. © 2024 SPIE.
AB - 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. In a single exposure, WALOP-South's innovative design will enable it to measure the linear polarization (Stokes parameters q and u) of all sources in a field of view (FoV) of 35 × 35 arc-minutes-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. In particular, the major technical hurdles for the project included the development of: (a) an optical design to achieve imaging quality PSFs across the FoV, (b) an optomechanical design to obtain high accuracy optical alignment in conjugation with minimal instrument flexure and stress birefringence on optics (which can lead to variable instrumental polarization), and (c) an on-sky calibration routine to remove the strong polarimetric cross-talk induced instrumental polarization to obtain 0.1% across the FoV. 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. While the instrument was initially scheduled for commissioning in 2022, it got delayed due to various technical challenges; WALOP-South is now on schedule for commissioning in second half of 2024. In this paper, we will present (a) the design and development of the entire instrument and its major subsystems, focusing the instrument's 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's optical performance. © 2024 SPIE.
KW - imaging polarimetry
KW - linear polarimetry
KW - optical polarimeter
KW - PASIPHAE
KW - polarimetry
KW - polarization
KW - stellar polarization
KW - WALOP
KW - wide field camera
UR - https://www.mendeley.com/catalogue/72146cac-f3ae-34fa-aadb-54de0eee9d58/
U2 - 10.1117/12.3016144
DO - 10.1117/12.3016144
M3 - материалы
SP - 292
Y2 - 16 June 2024 through 20 June 2024
ER -
ID: 126225126