Cold Head
Compressor
Compressor
Compressor
Transfer lines
Cold head
Cold head
1st stage
2nd stage
3rd stage
Rotary valve
Phigh
Plow
Compressor 10 - 20 bar typical
Rotary Valve
Displacer/Regenerator
Expansion Space
When the gas is compressed it heats up. The compressor compresses the gas and removes heat of compression.
Rotary valve alternately connects the cold cold head to the high and low sides of the compressor
From the Sumitomo web page
4K Cryocoolers Specification Chart
Model SRDK-408DModel SRDK-408D SRDK-415D
1st Stage Capacity
Watts @ 50Hz 31W @ 40K 35W @ 50K
Watts @ 60Hz 37W @ 40K 45W @ 50K
2nd Stage Capacity
1.0W @ 4.2K 1.5W @ 4.2K
Lowest Temperature 2nd Stage
<3.5K <3.5K
Cooldown Time 2nd Stage
<60min. (4.2K) <60min. (4.2K)
From the Sumitomo web page
A 4K Cold head from the Sumitomo web page
Cryogenic (UK) supply magnets up to 15T
Cooled with closed cycle coolers – from Cryogenic web page
This is a “special” three stage ordered from Sumitomo
1st stage 33W @ 68K
2nd Stage 8W @ 13.7K
3rd Stage 1W @ 4.2K
ALMA
Atacama Large Millimetre Array
Actual load at 4K is quite small …..
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