20994124 REV A
12
3.3 Cryocooler
The cryogenic cooler is the refrigeration device for the MVE Fusion. It is mounted on top
of the MVE Fusion dewar. It provides cryogenic cooling by mechanically compressing and
acoustically expanding the helium gas in a Stirling cycle. The base cryocooler unit
consists of a pressure wave generator (PWG) and a coaxial Stirling (pulse tube) coldhead
(see Figure 6). As liquid nitrogen boils off it rises to the top of the pressurized inner LN2
storage tank. There heat is removed from the gaseous nitrogen by the cryocooler and
converted back into a liquid. This highly efficient design eliminates the need for a constant
supply of LN2 and allows for autonomous operation. Figure 6 shows a schematic
representation of the cryocooler.
Figure 6: Cryocooler
Summary of Contents for MVE Fusion
Page 1: ...20994124 REV A 1 MVE FUSION Technical Manual ...
Page 8: ...20994124 REV A 8 Figure 2 Cross Section of the MVE Fusion Freezer ...
Page 16: ...20994124 REV A 16 Figure 9 Left to Right Vent Overfill Valve Relief Valve and Fill Valve ...
Page 35: ...20994124 REV A 35 Figure 24 a Format of the Data logs screen b Format of the Data file ...
Page 50: ...20994124 REV A 50 NOTES ...