Nov 9 2017
Notes from Kevin Jordan on trip Nov 8/9, 2017 to FermiLab
Discussions/meetings held with:
Primary contact: Elvin Harms
Met with Elvin Harms & Genfa Wu at the CMTF
Met with Tug Akin; Cryomodule assembly
Met with John Anderson, Randy Zifko, Greg Giese Safety/Interlocks group
CryoModule Test Facility Discussions
One theme was how to properly align the two modules in order to make up the conflat connections and then to be able to get a good leak check. In the Fermilab configuration there are no “U-Tubes” so evacuating & isolating the various Helium circuits to get the background to an acceptable level is a bit difficult. In the LERF configuration (as well as the test lab) we are able to do the leak check procedure prior to stabling the U-Tubes so the additional background of Helium from the cryo-plant is not present. Tag noted that making the beam line vacuum connection in the vault at the low elevation could be problematic.
This has been my concern and a motivation to have the end return can mounted in the test lab prior to moving to the LERF vault. He also noted that putting an epoxy coating on the floor, especially in the area of the beam line connection between the two modules would help in controlling the particle count in the portable clean hood.
I also noted that the clean hoods at Fermi had shelving around two sides, this is convenient and located below the critical location to minimize and introduced turbulence in the laminar flow. For the LERF installation this is impractical since the cryomodule will be so low to the floor – one can just stage tools on the (clean plastic covering the clean floor)
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