Temperature profile of IR-blocking windows used in cryogenic x-ray spectrometers

Details Temperature profile of IR-blocking windows used in cryogenic x-ray spectrometers Temperature profile of IR-blocking windows used in cryogenic x-ray spectrometers

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4140..452f&link_type=abstract

Proc. SPIE Vol. 4140, p. 452-458, X-Ray and Gamma-Ray Instrumentation for Astronomy XI, Kathryn A. Flanagan; Oswald H. Siegmund;

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Cryogenic high-resolution X-ray spectrometers are typically operated with thin IR blocking windows to reduce radiative heating of the detector while allowing good x-ray transmission. We have estimated the temperature profile of these IR blocking windows under typical operating conditions. We show that the temperature in the center of the window is raised due to radiation from the higher temperature stages. This can increase the infrared photon flux onto the detector, thereby increasing the IR noise and decreasing the cryostat hold time. The increased window temperature constrains the maximum window size and the number of windows required. We discuss the consequences for IR blocking window design.

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