ESS suggested that the compressed air should be something like 5 bar not 3.3 bar and this may explain why the open read-back of the valve VVD
UU answered that it i possible because our pressure can be up to 6 bar
CM09 is equipped with the original spare double-wall tubes (1st batch), neither repaired ones nor new ones
The tubes were leak-tested in the coupler conditioning bench during baking and no leaks were identified
ESS confirmed that they did not see any leaks in CM12 at warm even if the helium lines are pressurized
UU will perform rest of the tests (cold tuner, multipacting, heat load) and then perform another leak test during warming up
UU can keep ESS's leak detector until the end of W49
ESS suggested that UU can close on of the angle valves to let the leak detector receive a full signal
UU may change the target temperature of the standby operation such that the cavity temperature would oscillate just around the interesting temperature at 13 K, so for example between 4 K and 15 K in order to see if the helium signal wil be constant or decrease over the oscillation
Nicolas reported his latest results
Still no clear conclusion
The bigger motor option may be suspicious because a similar setup with such a motor for another project failed much earlier than our stepper motor
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