PARAMAGNETIC SALT PILL DESIGN FOR MAGNETIC REFRIGERATORS USED IN-SPACE APPLICATIONS

被引:30
作者
HAGMANN, C [1 ]
BENFORD, DJ [1 ]
RICHARDS, PL [1 ]
机构
[1] UNIV CALIF BERKELEY, SPACE SCI LAB, BERKELEY, CA 94720 USA
关键词
ADIABATIC DEMAGNETIZATION; REFRIGERATORS; SPACE CRYOGENICS;
D O I
10.1016/0011-2275(94)90171-6
中图分类号
O414.1 [热力学];
学科分类号
摘要
An adiabatic demagnetization refrigerator (ADR) is described which was designed for use in the multiband imaging photometer for the Space Infrared Telescope Facility (SIRTF). This refrigerator was required to cool bolometric detectors for infrared and millimetre waves to 0.1 K. A paramagnetic salt pill with a number of novel features was developed to meet the stringent requirements for an ADR used in space. An unusual paramagnetic salt, chromic caesium alum (CCA), is used to meet the requirement of thermal stability under the bake-out temperatures used in commissioning space cryogenic vacuum systems. The cycle time for the refrigerator has been reduced to almost-equal-to 30 min by attention to thermal time constants and by growing the CCA salt directly on to an array of gold wires. Crystal growing procedures were developed to overcome problems with the low solubility of CCA in water. The salt pill is sealed in stainless steel to retain water of hydration and is constructed of materials which are not corroded by commonly used paramagnetic salts.
引用
收藏
页码:213 / 219
页数:7
相关论文
共 27 条
[1]   A SEARCH FOR ANISOTROPY IN THE COSMIC MICROWAVE BACKGROUND ON INTERMEDIATE ANGULAR SCALES [J].
ALSOP, DC ;
CHENG, ES ;
CLAPP, AC ;
COTTINGHAM, DA ;
FISCHER, ML ;
GUNDERSEN, JO ;
KREYSA, E ;
LANGE, AE ;
LUBIN, PM ;
MEINHOLD, PR ;
RICHARDS, PL ;
SMOOT, GF .
ASTROPHYSICAL JOURNAL, 1992, 395 (02) :317-325
[2]   PARAMAGNETIC RESONANCE SPECTRA OF FIVE CHROMIC SULPHATE ALUMS AT LOW TEMPERATURES [J].
BLEANEY, B .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1950, 204 (1077) :203-216
[3]   HEAT CAPACITIES OF SOME DILUTE ALLOYS [J].
CHATENIER, FJD ;
NOBEL, JD .
PHYSICA, 1962, 28 (02) :181-&
[4]   SPECIFIC HEAT CAPACITY OF A STAINLESS STEEL [J].
DUCHATENIER, FJ ;
BOERSTOEL, BM ;
DENOBEL, J .
PHYSICA, 1965, 31 (07) :1061-+
[5]   A BOLOMETRIC MILLIMETER-WAVE SYSTEM FOR OBSERVATIONS OF ANISOTROPY IN THE COSMIC MICROWAVE BACKGROUND-RADIATION ON MEDIUM ANGULAR SCALES [J].
FISCHER, ML ;
ALSOP, DC ;
CHENG, ES ;
CLAPP, AC ;
COTTINGHAM, DA ;
GUNDERSEN, JO ;
KOCH, TC ;
KREYSA, E ;
MEINHOLD, PR ;
LANGE, AE ;
LUBIN, PM ;
RICHARDS, PL ;
SMOOT, GF .
ASTROPHYSICAL JOURNAL, 1992, 388 (02) :242-252
[6]  
GARRETT CGB, 1950, PHILOS MAG, V7, P621
[7]  
HAGMANN C, UNPUB
[8]   PROPERTIES OF THE CR+++ ION IN THE PARAMAGNETIC ALUMS AT LOW TEMPERATURES [J].
HUDSON, RP .
PHYSICAL REVIEW, 1952, 88 (03) :570-572
[9]  
HUDSON RP, 1972, PRINCIPLES APPLICATI
[10]   Absorption spectra of the chrome alums at low temperatures [J].
Kraus, DL ;
Nutting, GC .
JOURNAL OF CHEMICAL PHYSICS, 1941, 9 (02) :133-145