Optimization and performance of the Robert Stobie Spectrograph Near-InfraRed detector system

Gregory Mosby Jr.; Briana L. Indahl; Nathan Eggen; Marsha J. Wolf; Eric J. Hooper; Kurt P. Jaehnig; Donald J. Thielman; Mahesh P. Burse

doi:10.1117/1.JATIS.4.1.014001

2 January 2018 Optimization and performance of the Robert Stobie Spectrograph Near-InfraRed detector system

Gregory Mosby Jr., Briana L. Indahl, Nathan Eggen, Marsha J. Wolf, Eric J. Hooper, Kurt P. Jaehnig, Donald J. Thielman, Mahesh P. Burse

Author Affiliations +

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, Issue 1, 014001 (January 2018). https://doi.org/10.1117/1.JATIS.4.1.014001

Abstract

At the University of Wisconsin-Madison, we are building and testing the near-infrared (NIR) spectrograph for the Southern African Large Telescope—RSS-NIR. RSS-NIR will be an enclosed cooled integral field spectrograph. The RSS-NIR detector system uses a HAWAII-2RG (H2RG) HgCdTe detector from Teledyne controlled by the SIDECAR ASIC and an Inter-University Centre for Astronomy and Astrophysics (IUCCA) ISDEC card. We have successfully characterized and optimized the detector system and report on the optimization steps and performance of the system. We have reduced the CDS read noise to ∼20 e− for 200 kHz operation by optimizing ASIC settings. We show an additional factor of 3 reduction of read noise using Fowler sampling techniques and a factor of 2 reduction using up-the-ramp group sampling techniques. We also provide calculations to quantify the conditions for sky-limited observations using these sampling techniques.

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Gregory Mosby Jr., Briana L. Indahl, Nathan Eggen, Marsha J. Wolf, Eric J. Hooper, Kurt P. Jaehnig, Donald J. Thielman, and Mahesh P. Burse "Optimization and performance of the Robert Stobie Spectrograph Near-InfraRed detector system," Journal of Astronomical Telescopes, Instruments, and Systems 4(1), 014001 (2 January 2018). https://doi.org/10.1117/1.JATIS.4.1.014001

Received: 20 July 2017; Accepted: 4 December 2017; Published: 2 January 2018

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