Gw. Wilson et Pt. Timbie, Construction techniques for adiabatic demagnetization refrigerators using ferric ammonium alum, CRYOGENICS, 39(4), 1999, pp. 319-322
We describe techniques used to fabricate the cold stage of an adiabatic dem
agnetization refrigerator that uses the paramagnetic salt ferric ammonium a
lum. We discuss the design of a leak-tight housing for the salt as well as
a technique for growing ferric ammonium alum crystals that results in a hou
sing filled with > 98% refrigerant. These techniques have proven to be reli
able in creating robust single-stage refrigerators. Similar techniques can
be used for the second stage of a dual-stage adiabatic demagnetization refr
igerator. (C) 1999 Elsevier Science Ltd. All rights reserved.