1. Mechanical Cooler and Cryostat for Submillimeter SIS Mixer Receiver in Space
Junji Inatani, Teruhito Iida, Ryouta Satoh
National Space Development Agency
Katsuhiro Narasaki, Shoji Tsunematsu,
Makoto Kyoya
Sumitomo Heavy Industries, Ltd.
Takeshi Manabe, Masumichi Seta
Communications Research Laboratory
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

2. 8th International Symposium on Remote Sensing
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

3. 8th International Symposium on Remote Sensing
Signal Flow
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

4. Superconductive Submillimeter Mixer
SIS: Superconductor-Insulator-Superconductor
640 GHz
SIS MIxer for SMILES
Sensitivity of SIS Mixers
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

5. Requirements on the Cooler
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

6. 8th International Symposium on Remote Sensing
4 K Mechanical Cooler
Cooling to 100 K & 20 K:
Two-stage Stirling Cooler
Cooling to 4.5 K:
Joule-Thomson Cooler
Cooling Capacity:
20 mW @ 4.5 K K K
Power Consumption:
300 W @ 120 VDC
Mass:
Cooler 40 kg
Cryostat 26 kg
Electronics 24 kg
Total 90 kg
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

7. Two-stage Stirling Cycle Cooler
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

8. Two-stage Stirling Cycle Cooler
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

9. 8th International Symposium on Remote Sensing
Joule-Thomson Cooler
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

10. Joule-Thomson Compressors
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

11. 8th International Symposium on Remote Sensing
Cryostat
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

12. Thermal Design of the Cryostat
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

13. Thermal Capacity Measured (1/2)
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

14. Thermal Capacity Measured (2/2)
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

15. Lifetime Test of the J-T Cooler
Sept Dec. 1999
Operation: 9,315 hours
Halt
Halt
Halt
Halt
Flow Rate
/ Power
Flow Rate / Power
Return Press. [kgf/cm2A] / Power [W]
Flow Rate [NL/min] / Power [W]
Flow Rate / Power
Return Press.
/ Power
Supply Press. [kgf/cm2A] / Power [W]
Return Press. / P.
Return Press. / P.
Supply Press. / P.
Supply Press.
/ Power
Return Press. / P.
Supply Press. / P.
Supply Press. / P.
Time [hours]
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

16. Change of Performance in the Test Period
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

17. 8th International Symposium on Remote Sensing
System Integration
SRX:
Submillimeter Receiver
SMILES:
Superconducting Submillimeter-wave Limb-emission Sounder
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing

18. 8th International Symposium on Remote Sensing
Conclusions
We have designed, built, and tested a space-qualified 4 K cooler for a 640 GHz SIS mixer receiver for SMILES.
It is based on a two-stage Stirling cycle cooler and a Joule-Thomson cooler, both of which are integrated in a cryostat optimized for the receiver.
The cooler has demonstrated a cooling capacity of 20 mW at 4.6 K, 200 mW at 21 K, and 1000 mW at 100K.
The J-T cooler maintained its cold stage less than 5.0 K over 9,300 hours of real operation, although the cooling efficiency was gradually decreased. An improvement in the supporting structure of the pistons was tested and found promising.
The temperature of the 4 K stage was K. A modification of the connecting structure between the J-T orifice and the 4 K stage was tested and found useful to reduce the temperature.
All of the experimental results are now fully utilized in the detail design of the PFM cooler for SMILES.
Toulouse, Sept , 2001
8th International Symposium on Remote Sensing