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Proceedings Paper

Cryogenic near infrared spectropolarimeter for the Daniel K. Inouye Solar Telescope
Author(s): Andre Fehlmann; Cynthia Giebink; Jeffrey R. Kuhn; Ernesto J. Messersmith; Donald L. Mickey; Isabelle F. Scholl; Don James; Kirby Hnat; Greg Schickling; Richard Schickling
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Paper Abstract

The Cryogenic Near Infrared Spectropolarimeter for the Daniel K Inouye Solar Telescope is designed to measure polarized light from 0.5 to 5 μm. It uses an almost all reflective design for high throughput and an R2 echelle grating to achieve the required resolution of up to R = 100,000. The optics cooled to cryogenic temperatures reduce the thermal background allowing for IR observations of the faint solar corona. Both the spectrograph and its context imager use H2RG detector arrays with a newly designed controller to allow synchronized exposures at frame rates up to 10 Hz. All hardware has been built and tested and the key components met their design goals. 1) The cryogenic system uses mechanical closed cycle coolers which introduce vibrations. Our design uses a two stage approach with a floating mounting disk and flexible cold links to reduce these. The vibration amplitudes on all critical stages were measured and are smaller than 1μm. 2) The grating stage of the spectrograph uses a double stack of harmonic drives and an optical encoder to provide sub-arcsecond resolution and a measured repeatability of better than 0.5 arcsec.

Paper Details

Date Published: 9 August 2016
PDF: 10 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99084D (9 August 2016); doi: 10.1117/12.2232218
Show Author Affiliations
Andre Fehlmann, Institute for Astronomy (United States)
Univ. of Hawai'i (United States)
Cynthia Giebink, Institute for Astronomy (United States)
Univ. of Hawai'i (United States)
Jeffrey R. Kuhn, Institute for Astronomy (United States)
Univ. of Hawai'i (United States)
Ernesto J. Messersmith, Institute for Astronomy (United States)
Univ. of Hawai'i (United States)
Donald L. Mickey, Institute for Astronomy (United States)
Univ. of Hawai'i (United States)
Isabelle F. Scholl, Institute for Astronomy (United States)
Don James, Universal Cryogenics (United States)
Kirby Hnat, Universal Cryogenics (United States)
Greg Schickling, Universal Cryogenics (United States)
Richard Schickling, Universal Cryogenics (United States)


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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