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Proceedings Paper

SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain) on the South African Astronomical Observatory's 74-inch telescope
Author(s): Lisa A. Crause; Dave Carter; Alroy Daniels; Geoff Evans; Piet Fourie; David Gilbank; Malcolm Hendricks; Willie Koorts; Deon Lategan; Egan Loubser; Sharon Mouries; James E. O'Connor; Darragh E. O'Donoghue; Stephen Potter; Craig Sass; Amanda A. Sickafoose; John Stoffels; Pieter Swanevelder; Keegan Titus; Carel van Gend; Martin Visser; Hannah L. Worters
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Paper Abstract

SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain) is the extensively upgraded Cassegrain Spectrograph on the South African Astronomical Observatory's 74-inch (1.9-m) telescope. The inverse-Cassegrain collimator mirrors and woefully inefficient Maksutov-Cassegrain camera optics have been replaced, along with the CCD and SDSU controller. All moving mechanisms are now governed by a programmable logic controller, allowing remote configuration of the instrument via an intuitive new graphical user interface. The new collimator produces a larger beam to match the optically faster Folded-Schmidt camera design and nine surface-relief diffraction gratings offer various wavelength ranges and resolutions across the optical domain. The new camera optics (a fused silica Schmidt plate, a slotted fold flat and a spherically figured primary mirror, both Zerodur, and a fused silica field-flattener lens forming the cryostat window) reduce the camera’s central obscuration to increase the instrument throughput. The physically larger and more sensitive CCD extends the available wavelength range; weak arc lines are now detectable down to 325 nm and the red end extends beyond one micron. A rear-of-slit viewing camera has streamlined the observing process by enabling accurate target placement on the slit and facilitating telescope focus optimisation. An interactive quick-look data reduction tool further enhances the user-friendliness of SpUpNI

Paper Details

Date Published: 9 August 2016
PDF: 19 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990827 (9 August 2016); doi: 10.1117/12.2230818
Show Author Affiliations
Lisa A. Crause, South African Astronomical Observatory (South Africa)
Dave Carter, South African Astronomical Observatory (South Africa)
Alroy Daniels, South African Astronomical Observatory (South Africa)
Geoff Evans, South African Astronomical Observatory (South Africa)
Piet Fourie, South African Astronomical Observatory (South Africa)
David Gilbank, South African Astronomical Observatory (South Africa)
Malcolm Hendricks, South African Astronomical Observatory (South Africa)
Willie Koorts, South African Astronomical Observatory (South Africa)
Deon Lategan, Denel SpaceTeq (South Africa)
Egan Loubser, South African Astronomical Observatory (South Africa)
Sharon Mouries, South African Astronomical Observatory (South Africa)
James E. O'Connor, South African Astronomical Observatory (South Africa)
Darragh E. O'Donoghue, SALT Foundation (South Africa)
Stephen Potter, South African Astronomical Observatory (South Africa)
Craig Sass, South African Astronomical Observatory (South Africa)
Amanda A. Sickafoose, South African Astronomical Observatory (South Africa)
John Stoffels, South African Astronomical Observatory (South Africa)
Pieter Swanevelder, South African Astronomical Observatory (South Africa)
Keegan Titus, South African Astronomical Observatory (South Africa)
Carel van Gend, South African Astronomical Observatory (South Africa)
Martin Visser, South African Astronomical Observatory (South Africa)
Hannah L. Worters, South African Astronomical Observatory (South Africa)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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