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Non-metallic dilution refrigerator
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the industry-previews-research are also available, including melting curve thermometers. The basic unit can be supplied w i t h a number of circulation systems. Specifications are detailed in Table 1.
Non-metallic dilution refrigerator For the user w h o does not require such a powerful machine we offer a revolutionary new concept in 'top loading dipstik' type refrigerators; the non-metallic refrigerator. The non-electrically conducting design of the lower end (discrete heat exchanger, mixing chamber, IVC, etc.) of this unit completely eliminates
•
the industry-previews-research
traditional eddy current problems when operated in magnet field. The sample is located directly in the dilute helium-3 phase in the mixing chamber, providing excellent thermal contact in a totally nonmagnetic, non-electrically conducting environment. Rapid sample turn around is achieved by removing the whole insert from the cryostat. Again, the unit can be offered with a number of circulation systems. Basic specifications are as shown in Table 2. If you require further information please c o n t a c t our Research System Manager, Dr Jim Hutchins, Cryogenic, Metrostore Building, 231 The Vale, London W3 7QS, UK
Table 2 Specifications of non-metallic dilution refrigerator
Circulation system (/~m s-1)
Cooling power at 100 mK (mW)
Base temperature (mK)
50 400 80O
30 200 300
15 12 10
1 5 - 1 7 Tesla supercompact magnets Cryogenic (Cryogenic Consultants Limited) has introduced a new range of superconducting solenoids, which produce state-ofthe art high magnetic fields while minimizing size, mass and stored energy parameters. This is achieved by fully utilizing the higher critical current density available from new tertiary metal doped Nb3Sn conductors. A major benefit of the more compact construction is that the Supercompacts can be accommodated in small helium cryostats such as Cryogenic's model R200, which has an inside diameter of only 200 mm - this saves on installation costs and also reduces helium
558
Cryogenics 1990 Vol 30 June
usage - the magnets are therefore very economical to operate. The manufacturing process uses an advanced and wind-and-react technique followed by vacuum impregnation of the winding with epoxy resin. This ensures a high level of stability of operation in persistent mode and also a unique fast-ramping capability which allows fields to be swept at up to 3 T min-1 The Supercompact range includes standard 15 and 16 Tesla magnets with 53 mm bores and a 17 Tesla version with a 40 mm bore. All models are now available with rapid delivery, either separately or as part of a complete full instrumented cryomagnet system. (Cryogenic Consultants Limited, Metrostore Building, 231 The Vale, London W3 7QS. Tel (1) 743 6049).
Lake Shore MTD-114 test dewar system configured for simultaneous testing of up to four 68-pin focal plane arrays Lake Shore Cryotronics introduces the MTD-144, the latest addition to their MTD cryotest systems product family. The MTD-144 features a leadless chip carrier (LCC) configuration which enables simultaneous testing of up to four 68-pin focal plane arrays. Used for high volume testing of infrared focal plane arrays and integrated circuits, the MTD-144 can be loaded and unloaded in a clean room environment. This easy preloading of multiple samples under controlled conditions eliminates the difficulties associated with one-attime handling of test devices in a dewar during high t h r o u g h p u t operating periods. Cryogen consumption is dramatically reduced with only one coobdown cycle required for the simultaneous testing of four devices. The M T D - 1 4 4 requires no transfer lines. Its 4 I LN2 reservoir can be filled in a central staging area and carried to a test station. An integrated pour-fill dewar rapidly cools the test chamber to liquid nitrogen temperature with a hold time of 4 - 6 h. Optical w i n d o w s are positioned over each of the four interior LCC test locations. The test dewar can be rotated in 90 ° increments over a blackbody source, providing the means to conduct flood illumination screening tests at each LCC position.
Model MTD 144 test dewar system
the industry-previews-research are also available, including melting curve thermometers. The basic unit can be supplied w i t h a number of circulation systems. Specifications are detailed in Table 1.
Non-metallic dilution refrigerator For the user w h o does not require such a powerful machine we offer a revolutionary new concept in 'top loading dipstik' type refrigerators; the non-metallic refrigerator. The non-electrically conducting design of the lower end (discrete heat exchanger, mixing chamber, IVC, etc.) of this unit completely eliminates
•
the industry-previews-research
traditional eddy current problems when operated in magnet field. The sample is located directly in the dilute helium-3 phase in the mixing chamber, providing excellent thermal contact in a totally nonmagnetic, non-electrically conducting environment. Rapid sample turn around is achieved by removing the whole insert from the cryostat. Again, the unit can be offered with a number of circulation systems. Basic specifications are as shown in Table 2. If you require further information please c o n t a c t our Research System Manager, Dr Jim Hutchins, Cryogenic, Metrostore Building, 231 The Vale, London W3 7QS, UK
Table 2 Specifications of non-metallic dilution refrigerator
Circulation system (/~m s-1)
Cooling power at 100 mK (mW)
Base temperature (mK)
50 400 80O
30 200 300
15 12 10
1 5 - 1 7 Tesla supercompact magnets Cryogenic (Cryogenic Consultants Limited) has introduced a new range of superconducting solenoids, which produce state-ofthe art high magnetic fields while minimizing size, mass and stored energy parameters. This is achieved by fully utilizing the higher critical current density available from new tertiary metal doped Nb3Sn conductors. A major benefit of the more compact construction is that the Supercompacts can be accommodated in small helium cryostats such as Cryogenic's model R200, which has an inside diameter of only 200 mm - this saves on installation costs and also reduces helium
558
Cryogenics 1990 Vol 30 June
usage - the magnets are therefore very economical to operate. The manufacturing process uses an advanced and wind-and-react technique followed by vacuum impregnation of the winding with epoxy resin. This ensures a high level of stability of operation in persistent mode and also a unique fast-ramping capability which allows fields to be swept at up to 3 T min-1 The Supercompact range includes standard 15 and 16 Tesla magnets with 53 mm bores and a 17 Tesla version with a 40 mm bore. All models are now available with rapid delivery, either separately or as part of a complete full instrumented cryomagnet system. (Cryogenic Consultants Limited, Metrostore Building, 231 The Vale, London W3 7QS. Tel (1) 743 6049).
Lake Shore MTD-114 test dewar system configured for simultaneous testing of up to four 68-pin focal plane arrays Lake Shore Cryotronics introduces the MTD-144, the latest addition to their MTD cryotest systems product family. The MTD-144 features a leadless chip carrier (LCC) configuration which enables simultaneous testing of up to four 68-pin focal plane arrays. Used for high volume testing of infrared focal plane arrays and integrated circuits, the MTD-144 can be loaded and unloaded in a clean room environment. This easy preloading of multiple samples under controlled conditions eliminates the difficulties associated with one-attime handling of test devices in a dewar during high t h r o u g h p u t operating periods. Cryogen consumption is dramatically reduced with only one coobdown cycle required for the simultaneous testing of four devices. The M T D - 1 4 4 requires no transfer lines. Its 4 I LN2 reservoir can be filled in a central staging area and carried to a test station. An integrated pour-fill dewar rapidly cools the test chamber to liquid nitrogen temperature with a hold time of 4 - 6 h. Optical w i n d o w s are positioned over each of the four interior LCC test locations. The test dewar can be rotated in 90 ° increments over a blackbody source, providing the means to conduct flood illumination screening tests at each LCC position.
Model MTD 144 test dewar system