This paper describes the design, fabrication, and testing of a low-temperature detector mount system which provides thermal isolation between detector electronics, operating at 80 kelvins, and a quartz telescope at 2.5 kelvins. The detector will be used to acquire and track the guide star for the Gravity Probe B Relativity Mission. The detector mount makes use of flex circuit technology for the critical thermal isolator. The detector mounts are configured in a redundant manner through the use of a beamsplitting optic. The entire package mounts to a quartz post through a semi-kinematic mount. Design consideration is given to electromagnetic interference and low-remanent magnetic moment. The detector mounts use a flex cable for electrical connections, as well as thermal grounding. The principal benefit of this design is the ability to operate relatively warm pre-amplifier electronics in a low-temperature environment with minimal disruption to a cryogenic system.Test results have shown this detector mount capable of dissipating less than 2 milliwatts with an 80 K temperature differential.
A b&actCathodes made of thin-film field emission arrays (FEA) have the advantages of high current density, pulsed emission, and low bias voltage operation.We have developed a technology to fabricate knife-edge field emission cathodes on (110) silicon wafers. The emitter geometry is optimized for efficient modulation at high frequency. Cathode fabrication progress and preliminary analysis of their a.pplications in RF power sources are presented.
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