Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review
WALOP-South : A wide-field one-shot linear optical polarimeter for PASIPHAE survey. / Maharana, Siddharth; Kypriotakis, John A.; Ramaprakash, A. N.; Khodade, Pravin; Rajarshi, Chaitanya; Joshi, Bhushan; Chordia, Pravin; Anche, Ramya M.; Shrish, ; Blinov, Dmitry; Eriksen, Hans Kristian; Ghosh, Tuhin; Gjerløw, Eirik; Mandarakas, Nikolaos; Panopoulou, Georgia V.; Pavlidou, Vasiliki; Pearson, Timothy J.; Pelgrims, Vincent; Potter, Stephen B.; Readhead, Anthony C.S.; Skalidis, Raphael; Tassis, Konstantinos; Wehus, Ingunn K.
Ground-Based and Airborne Instrumentation for Astronomy VIII. ed. / Christopher J. Evans; Julia J. Bryant; Kentaro Motohara. SPIE, 2020. 114475E (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11447).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review
}
TY - GEN
T1 - WALOP-South
T2 - Ground-Based and Airborne Instrumentation for Astronomy VIII 2020
AU - Maharana, Siddharth
AU - Kypriotakis, John A.
AU - Ramaprakash, A. N.
AU - Khodade, Pravin
AU - Rajarshi, Chaitanya
AU - Joshi, Bhushan
AU - Chordia, Pravin
AU - Anche, Ramya M.
AU - Shrish,
AU - Blinov, Dmitry
AU - Eriksen, Hans Kristian
AU - Ghosh, Tuhin
AU - Gjerløw, Eirik
AU - Mandarakas, Nikolaos
AU - Panopoulou, Georgia V.
AU - Pavlidou, Vasiliki
AU - Pearson, Timothy J.
AU - Pelgrims, Vincent
AU - Potter, Stephen B.
AU - Readhead, Anthony C.S.
AU - Skalidis, Raphael
AU - Tassis, Konstantinos
AU - Wehus, Ingunn K.
N1 - Publisher Copyright: © 2020 SPIE
PY - 2020
Y1 - 2020
N2 - WALOP (Wide-Area Linear Optical Polarimeter)-South, to be mounted on the 1m SAAO telescope in South Africa, is first of the two WALOP instruments currently under development for carrying out the PASIPHAE survey. Scheduled for commissioning in the year 2021, the WALOP instruments will be used to measure the linear polarization of around 106 stars in the SDSS-r broadband with 0.1 % polarimetric accuracy, covering 4000 square degrees in the Galactic polar regions. The combined capabilities of one-shot linear polarimetry, high polarimetric accuracy (< 0.1 %) and polarimetric sensitivity (< 0.05 %), and a large field of view (FOV) of 35 × 35 arcminutes make WALOP-South a unique astronomical instrument. In a single exposure, it is designed to measure the Stokes parameters I, q and u in the SDSS-r broadband and narrowband filters between 500-700 nm. During each measurement, four images of the full field corresponding to the polarization angles of 0◦, 45◦, 90◦ and 135◦ will be imaged on four detectors and carrying out differential photometry on these images will yield the Stokes parameters. Major challenges in designing WALOP-South instrument include- (a) in the optical design, correcting for the spectral dispersion introduced by large split angle Wollaston Prisms used as polarization analyzers as well as aberrations from the wide field, and (b) making an optomechanical design adherent to the tolerances required to obtain good imaging and polarimetric performance under all temperature conditions as well as telescope pointing positions. We present the optical and optomechanical design for WALOP-South which overcomes these challenges.
AB - WALOP (Wide-Area Linear Optical Polarimeter)-South, to be mounted on the 1m SAAO telescope in South Africa, is first of the two WALOP instruments currently under development for carrying out the PASIPHAE survey. Scheduled for commissioning in the year 2021, the WALOP instruments will be used to measure the linear polarization of around 106 stars in the SDSS-r broadband with 0.1 % polarimetric accuracy, covering 4000 square degrees in the Galactic polar regions. The combined capabilities of one-shot linear polarimetry, high polarimetric accuracy (< 0.1 %) and polarimetric sensitivity (< 0.05 %), and a large field of view (FOV) of 35 × 35 arcminutes make WALOP-South a unique astronomical instrument. In a single exposure, it is designed to measure the Stokes parameters I, q and u in the SDSS-r broadband and narrowband filters between 500-700 nm. During each measurement, four images of the full field corresponding to the polarization angles of 0◦, 45◦, 90◦ and 135◦ will be imaged on four detectors and carrying out differential photometry on these images will yield the Stokes parameters. Major challenges in designing WALOP-South instrument include- (a) in the optical design, correcting for the spectral dispersion introduced by large split angle Wollaston Prisms used as polarization analyzers as well as aberrations from the wide field, and (b) making an optomechanical design adherent to the tolerances required to obtain good imaging and polarimetric performance under all temperature conditions as well as telescope pointing positions. We present the optical and optomechanical design for WALOP-South which overcomes these challenges.
KW - Four-channel polarimetry
KW - Optical polarimetry
KW - PASIPHAE
KW - Stellar polarimetry
KW - Stokes parameters
KW - WALOP
KW - Wide-field polarimetry
UR - http://www.scopus.com/inward/record.url?scp=85103692851&partnerID=8YFLogxK
U2 - 10.1117/12.2554396
DO - 10.1117/12.2554396
M3 - Conference contribution
AN - SCOPUS:85103692851
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Ground-Based and Airborne Instrumentation for Astronomy VIII
A2 - Evans, Christopher J.
A2 - Bryant, Julia J.
A2 - Motohara, Kentaro
PB - SPIE
Y2 - 14 December 2020 through 22 December 2020
ER -
ID: 85094668