Hybrid Cooler System for Superconducting Electronics

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: F29601-02-C-0273
Agency Tracking Number: 02-0062T
Amount: $70,000.00
Phase: Phase I
Program: STTR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Atlas Scientific
1367 Camino Robles Way, San Jose, CA, 95120
DUNS: 938515913
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Ali Kashani
 Program Director
 (408) 507-0906
Business Contact
 Ali Kashani
Title: program Director
Phone: (408) 507-0906
Email: akashani@atlasscientific.com
Research Institution
 University of Wisconsin-Madison
 Charles Hoffman
 Dept of Mechanical Engineering, 1500 Engineering Dr.
Madison, WI, 50706
 (608) 262-0253
 Nonprofit college or university
"We propose to develop an innovative 10 K cooling system that will be ideally suited to the cryogenic packaging requirements of a space-based superconducting electronics system. To achieve the most efficient and reliable hybrid cooler possible, we proposeto combine a multi-stage, linear-drive pulse tube with a low-temperature reverse-Brayton stage. In this way we will take advantage of the strengths of each system, while minimizing their respective weaknesses. The system avoids the inherent lossesassociated with a regenerator at low temperature, as well as, the inefficiencies associated with the Joule-Thompson process, by incorporating a novel turbo-expander in the low temperature reverse-Brayton stage. The use of a low-vibration, linear,compressor for the pulse-tube stage provides a large pressure ratio allowing the size and expense of the recuperative heat exchanger to be minimized. These features result in a low-mass reverse-Brayton stage that can be fabricated reliably, at a reasonablecost, without sacrificing performance. The proposed hybrid cryocooler will achieve unprecedented efficiency below 10 K without resorting to high-unit-cost technologies such as super-critical shafts or extremely precise bearing clearances. The system willexhibit the high reliability and low vibration associated with pulse-tube and turbomachine-based reverse-Brayton systems. Many advances in missile defense applications, such as ground or space-based systems for surveillance and missile tracking, willrequire advances in electronic devices. For example, to improve the ultimate signal to noise ratio obtainable from cryogenic IR focal plane arrays (FPA), it is desirable to have on-focal plane, high-resolution, analog-to-digital data (A/D) converters. SuchA/D converters, based on the Josephson effect in low-temperature superconductors, and supporting technology are currently in various stages of developmentCryocoolers can also be employed in a wide variety of commercial applications. The following lists present and potential future applications: cryopumps for

* information listed above is at the time of submission.

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