Improvements to Cryogenic Detector Readout Systems

Period of Performance: 06/08/2015 - 03/07/2016


Phase 1 SBIR

Recipient Firm

Hypres, Inc.
175 Clearbrook road Array
Elmsford, NY 10523
Firm POC
Principal Investigator


This SBIR project is to improve the readout system used for cryogenic detector arrays. A frequency multiplexed scheme call fMUX is one of the prevalent methods, which is used to read out the response of cryogenic detectors, such as Transition Edge Sensors TES) Bolometers, operating at mK temperatures used for astrophysical observations of the Cosmic Microwave Background CMB). The electronics for the TES readout approach is maintained at room temperature and requires careful, wiring to minimize stray wiring inductance, stray capacitance, while at the same time minimizing the cryogenic heat load. We propose to develop improvements to this system by developing drop in replacement components, specifically in the link between the 4K cryocooler stage and 250mK TES. We propose to build a low inductance flexible line which will go the majority of the physical distance from the 4K stage to the 250mK bolometer array. Any stray inductance in these lines can cause reduced system performance by introducing unwanted crosstalk, so its electrical and thermal properties must be precisely managed. We also propose to build a Monolithic Microwave Integrated Circuit MMIC) which would retrofit the resonator board currently used. This resonator structure required for the frequency multiplexing scheme is currently achieved by using discrete surface mount capacitors and custom fabricated inductances, we would replace these discrete elements with lumped element resonators, which are easy to reproduce in the mass quantities required in the Thin film based multi-layer HYPRES Superconducting fabrication technology. The HYPRES goal is to develop technology, which once developed could be introduced with no other change to current readout architecture and thus would be low risk, high reward retrofit for the experiment which uses it. In Phase I project, we will simulate, fabricate and test parts of these components. In Phase II we plan to concentrate on delivering a fully working prototype employing our improvement directly to the Cryogenic detector community. Argonne National Lab is part of the CMB Telescope deployed at the South Pole, responsible for fabricating the TES Bolometers. Our final product is intended to interface directly with the Bolometer wedge they are making, so we plan to work closely with them to insure that our components can be drop in improved replacements for their current solution.