24 July 2014 Environmental control system for Habitable-zone Planet Finder (HPF)
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Abstract
HPF is an ultra-stable, precision radial velocity near infrared spectrograph with a unique environmental control scheme. The spectrograph will operate at a mid-range temperature of 180K, approximately half way between room temperature and liquid nitrogen temperature; it will be stable to sub -milli-Kelvin(mK) levels over a calibration cycle and a few mK over months to years. HPF‟s sensor is a 1.7 micron H2RG device by Teledyne. The environmental control boundary is a 9 m2 thermal enclosure that completely surrounds the optical train and produces a near blackbody cavity for all components. A large, pressure - stabilized liquid nitrogen tank provides the heat sink for the system via thermal straps while a multichannel resistive heater control system provides the stabilizing heat source. High efficiency multi-layer insulation blanketing provides the outermost boundary of the thermal enclosure to largely isolate the environmental system from ambient conditions. The cryostat, a stainless steel shell derived from the APOGEE design, surrounds the thermal enclosure and provides a stable, high quality vacuum environment. The full instrument will be housed in a passive „meat -locker‟ enclosure to add a degree of additional thermal stability and as well as protect the instrument. Effectiveness of this approach is being empirically demonstrated via long duration scale model testing. The full scale cryostat and environmental control system are being constructed for a 2016 delivery of the instrument to the Hobby-Eberly Telescope. This report describes the configuration of the hardware and the scale-model test results as well as projections for performance of the full system.
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Fred Hearty, Fred Hearty, Eric Levi, Eric Levi, Matt Nelson, Matt Nelson, Suvrath Mahadevan, Suvrath Mahadevan, Adam Burton, Adam Burton, Lawrence Ramsey, Lawrence Ramsey, Chad Bender, Chad Bender, Ryan Terrien, Ryan Terrien, Samuel Halverson, Samuel Halverson, Paul Robertson, Paul Robertson, Arpita Roy, Arpita Roy, Basil Blank, Basil Blank, Ken Blanchard, Ken Blanchard, Gudmundur Stefansson, Gudmundur Stefansson, } "Environmental control system for Habitable-zone Planet Finder (HPF)", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914752 (24 July 2014); doi: 10.1117/12.2056720; https://doi.org/10.1117/12.2056720
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