Conveners
C1OrB - Cryogenic Heat Transfer
- Bertrand Baudouy (CEA Saclay)
- James Tuttle (NASA/GSFC)
Dr
Mark Kimball
(NASA/Goddard Space Flight Center)
6/29/15, 11:00 AM
CEC-12 - Fluid Mechanics, Heat Transfer, and Cryogen Properties
Contributed Oral Presentation
The adiabatic demagnetization refrigerator (ADR) developed for the Astro-H Soft-Xray Spectrometer (SXS) is a multi-stage solid-state cooler. It is capable of holding the SXS detector array at 0.050 K for greater than 24 hours with a recycle time of less than one hour. This quick recycle time relies upon high-conductivity thermal straps to couple the individual stages to a pair of heat switches...
Mark Kimball
6/29/15, 11:15 AM
CEC-12 - Fluid Mechanics, Heat Transfer, and Cryogen Properties
Contributed Oral Presentation
The Soft X-ray Spectrometer (SXS) destined for the Japanese Astro-H mission contains a 6x6 array of microcalorimeters. To achieve ultimate resolution the array must be electrically isolated from the rest of the instrument as well as cooled to 0.050 K. The latter is achieved by directly coupling it to the coldest stage of a multi-stage Adiabatic Demagnetization Refrigerator (ADR). Thus, the...
Gonçalo Tomás
(LIBPhys, Physics Department, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa)
6/29/15, 11:30 AM
CEC-12 - Fluid Mechanics, Heat Transfer, and Cryogen Properties
Contributed Oral Presentation
The development and characterization of new materials is of extreme importance in the design of cryogenic apparatus. Recently the Versarien company developed a technique capable of producing copper foam with controlled porosity and pore size. Such porous materials could be interesting for cryogenic heat exchangers as well as of special interest in some cryogenic devices for microgravity...
Mr
Peter Bradley
(NIST)
6/29/15, 11:45 AM
CEC-12 - Fluid Mechanics, Heat Transfer, and Cryogen Properties
Contributed Oral Presentation
Micro-scaling cryogenic refrigerators, in particular the Joule-Thomson (JT) variety requires very good information about heat transfer characteristics of the refrigerants flowing in the microchannel for optimal design and performance. There are numerous studies regarding heat transfer coefficient measurements of liquid flow in microchannels at/near ambient temperature and high Reynolds flow...
Ram Dhuley
(Florida State University)
6/29/15, 12:00 PM
CEC-12 - Fluid Mechanics, Heat Transfer, and Cryogen Properties
Contributed Oral Presentation
Linear accelerators (LINACs) using superconducting radio frequency (SRF) technology comprise of a long string of SRF cavities housed in discreet cryomodules. This cavity string is operated immersed in liquid helium (LHe) with high vacuum on its inside. Sudden loss of this cold vacuum to surrounding atmosphere perceivably is the worst failure mode of the LINAC. An accidental rupture at any...
