Coronagraphic and low-emissivity astronomical reflector (CLEAR): heat trap design

Walter A. Siegmund

doi:10.1117/12.319240

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25 August 1998 Coronagraphic and low-emissivity astronomical reflector (CLEAR): heat trap design

Walter A. Siegmund

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Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319240
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The heat trap in a coronagraphic telescope is located at its prime focus and blocks the transmission of radiation from unwanted portions of the solar disk to subsequent optics in the telescope. This reduces light scattered and heat absorbed by these optics. For observations of the corona, the solar disk is completely blocked, whereas for observations of the disk, typically 90% or more of the disk is blocked. The proposed heat trap design is constructed largely of fused silica plates, partially coated with platinum, and cooled with air. It is robust and handles high irradiance, i.e., almost f megawatt/m² at f/3.75, without degrading the image quality of the telescope or contributing significant stray light to the focal surface.

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Walter A. Siegmund "Coronagraphic and low-emissivity astronomical reflector (CLEAR): heat trap design", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319240

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