|
|
[<< Home](/home#3-front-end-design-panel-charge-3)
|
|
|
|
|
|
[<< Section 3.6](/3-front-end-design/3.6)
|
|
|
|
|
|
## 3.7 Cooling System and He Lines
|
|
|
|
|
|
### Cold Heads and Compressor
|
|
|
For the cooling system design, it was decided early on in the process to avoid the use of liquid cryogens in order to simplify operations and be compatible with AO best working practices. Since it is more efficient to intercept environmental heat loads at higher temperatures, an intermediate temperature guard stage “surrounds” the 20 K second cold stage, sinking room temperature thermal radiation before it reaches the 2nd stage, and providing a temperature guard for wiring and structural components. This two stage configuration is readily aligned to commercial two-stage Gifford-McMahon cryocoolers. In our case, three M1020 cold heads from Trillium are sufficient to handle the load. These cold heads can be run through a single air-cooled Trillium M700 compressor simplifying operations.
|
|
|
|
|
|
![ALP-GBO_Cooling_Schematic](../uploads/70eaf236b55bcac5b274f8011b22e576/ALP-GBO_Cooling_Schematic.png)
|
|
|
|
|
|
<kbd>Figure 1: A schematic diagram showing the connections going from the compressor to the cold heads. The compressor would be located at the Alidade and the cryostat would be installed at the Prime Focus arm.
|
|
|
</kbd>
|
|
|
|
|
|
[Section 3.8 >>](/3-front-end-design/3.8) |
|
|
\ No newline at end of file |