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Proceedings Paper

A new two channel high-speed photo-polarimeter (HIPPO) for the SAAO
Author(s): Stephen Potter; David Buckley; Darragh O'Donoghue; James O'Conner; Piet Fourie; Geoff Evans; Craig Sass; Lisa Crause; O. W. Butters; Andrew Norton; Koji Mukai; Martin Still
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Paper Abstract

We report on the completion of a new 2 channel, HIgh speed Photo-POlarimeter (HIPPO) for the 1.9m optical telescope of the South African Astronomical Observatory. The instrument makes use of rapidly counter-rotating (10Hz), super-achromatic half- and quarter-waveplates, a fixed Glan-Thompson beamsplitter and two photo-multiplier tubes that record the modulated O and E beams. Each modulated beam permits an independent measurement of the polarisation and therefore simultaneous 2 filter observations. All Stokes parameters are recorded every 0.1sec and photometry every 1 millisecond. Post-binning of data is possible in order to improve the signal. This is ideal for measuring e.g. the rapid variability of the optical polarisation from magnetic Cataclysmic Variable stars. First light was obtained in February 2008.

Paper Details

Date Published: 11 July 2008
PDF: 7 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70145E (11 July 2008); doi: 10.1117/12.789716
Show Author Affiliations
Stephen Potter, South African Astronomical Observatory (South Africa)
David Buckley, South African Astronomical Observatory (South Africa)
Darragh O'Donoghue, South African Astronomical Observatory (South Africa)
James O'Conner, South African Astronomical Observatory (South Africa)
Piet Fourie, South African Astronomical Observatory (South Africa)
Geoff Evans, South African Astronomical Observatory (South Africa)
Craig Sass, South African Astronomical Observatory (South Africa)
Lisa Crause, South African Astronomical Observatory (South Africa)
O. W. Butters, The Open Univ. (United Kingdom)
Andrew Norton, The Open Univ. (United Kingdom)
Koji Mukai, CRESST, NASA Goddard Space Flight Ctr., and Univ. of Maryland, Baltimore County (United States)
Martin Still, Mullard Space Science Lab., Univ. College London (United Kingdom)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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