Thermal management for CCD performance on the Advanced Camera for Surveys (ACS)

Gregory B. Johnson

doi:10.1117/12.324528

28 August 1998 Thermal management for CCD performance on the Advanced Camera for Surveys (ACS)

Gregory B. Johnson

Proceedings Volume 3356, Space Telescopes and Instruments V; (1998) https://doi.org/10.1117/12.324528
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The advanced camera for surveys, an instrument containing two CCD cameras and a MAMA detector, is being build by Ball Aerospace and Technologies Corporation for NASA. The instrument will be placed in the Hubble Space Telescope during a space shuttle mission in December 1999. The CCD detectors need to operate at a temperature below -80 degrees C in order to avoid unacceptable dark current. This cooling is achieved through detailed thermal design which minimizes the parasitic load to a 4K by 4K array with 15 micron pixels and cools this wide field channel detector with a combination of thermo-electric coolers (TECs). This paper will describe the innovative thermal design necessary to maintain the WFC CCD at its cold operating temperature while providing the means to reject the heat generated by the TECs. It will focus on optimization techniques developed to manage parasitic loads including material selection, surface finishes and thermal isolation. The paper will also address analytical techniques developed to characterize TEC performance. Finally, a comparison with the STIS CCD design currently operating in the Hubble Space Telescope will be made.

Citation Download Citation

Gregory B. Johnson "Thermal management for CCD performance on the Advanced Camera for Surveys (ACS)", Proc. SPIE 3356, Space Telescopes and Instruments V, (28 August 1998); https://doi.org/10.1117/12.324528

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