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--- operation:technical [2017/12/05 00:17]
Warren Hankey
+++ operation:technical [2018/01/12 05:48]
Warren Hankey
@@ Line 23: / Line 23: @@
 http://webcamyg.phys.utas.edu.au
+===Cryo===
+Warmed and pressure drop
+- commence vaccuming S/X using turbo pump
+- turn off the SX cryodyne in the diesel room so that the blue motor stops
+- turn off the L-band cryodyne by pulling out the lead to the L-band
+cold head in the focus cabin
+- use hastings vac gauge and Edwards oil filled vac pump to pump L-band
+dewar while it warms(dear valve open whilst pumping).
+- top up the helium supply to 300 psi if the compressor is running OK.
+If has shut down, increase the pressure slightly then restart the
+compressor and increase the pressure to 300 psi supply.
+- locate the leak
+- power down the compressor
+- replace leaking hose
+- power up the compressor
+-top helium up to 300 psi
+- commence s/x cooling by turning on cryo S/X power in diesel room
+- start L-band cryodyne
+- 3 hours of cooling with vac pump on L-band is required
+- close l-band dewar valve
+- remove Edwards pump.
+-close SX dewar valve and turn off turbo