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1 December 1991 Temperature control of the 3.5-meter WIYN telescope primary mirror
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The WIYN telescope primary mirror is the 3.5-m, second mirror cast at the University of Arizona. The borosilicate glass temperature of the mirror is regulated during use to limit the distortions caused from thermal expansion, and to limit mirror seeing caused by natural convection. The thermal regulation system includes a closed air cooling plenum within the mirror cell structure with blowers and heat exchangers. Heat generated by this system and that from the glass is carried away by another liquid cooling loop to a remotely positioned liquid chilling unit. The system can regulate the mirror temperature to +/- 0.2 C from a temperature set point near ambient air for typical static and dynamic environments. Evaluation of the system includes a full laboratory optical test of the mirror, support, cell, and temperature control system. Data on the performance of the thermal control is summarized in terms of the quantities of temperature deltas across the system components and flows of air, water, and heat.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Larry W. Goble "Temperature control of the 3.5-meter WIYN telescope primary mirror", Proc. SPIE 1532, Analysis of Optical Structures, (1 December 1991);

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