Minutes and Action List of August 3 2020 ArgonCube2x2 Installation Meeting
- Attendee: Tom, Angela, Min Jeong,Steve, Gary and Ting
- News: The decommissioning is going well. We are projecting to finish MINERvA mid of September. We need MINOS handrail re-installed before start MINOS module removal.
- Min Jeong discussed recent development on ArgonCube2x2 cryostat access platform design requirement:
- More electronics equipment are being planed to located on the platform. Those equipment are to be on clean AC power.
- There is a new requirement of minimum distance from cryostat metal shell and platform support beam. Gary to check what we have now in the module and will adjust the space accordingly.
- We discussed the egress requirement of the platform. Middle section (cryostat top plate) should not be part of the safety pathway. Thus people on west half of the platform should go to west catwalk in emergency escape, people on east should take the east catwalk then go downstream through overhead bridge for emergency.
- Downstream overhead can not be removed as it is part of the egress -- we will avoid to do this if possible.
- Considering potential more space requirement downstream for other experiment tests, it is suggested to move the whole 2x2+MINERvA module layout further upstream by ~2m.
- detail to be decided after the MINOS handrail design
- Width of the access platform now is more than 2 meters. This is more than 36" requirement
- The gate opening on both east and west should also meet minimum width egress requirement --- Angela will check the code and gets back on this
- We also had some discuss on the requirement of the platform handrails on the south and north sides.
- The minimum height requirement should be checked out -- Angela will get back on this
- The fall protection requirement depends on the height of the platform -- Min Jeong will make a measurement
- We decided we need to make the handrail removable:
- to remove tall object over the platform
- to access MINERvA electronics
- For removable handrail, we need fall protection thus anchor points for harness etc.
- It is pointed out we need to have updated cryostat top module to have more complete equipment layout including feedthrough, cryogenic instrumentation and electronics. We will work with BERN group and our cryogenic team to do this.
- Discuss on MINOS handrail replacement design is postponed to next meeting. It will be nice to distribute layout drawing etc. to the group before the meeting
- Action task list:
- Gary to check spacing between cryostat shell and access platform support beam and increase them to 8" or more if needed
- Angela to check access platform gate opening width requirement
- Min Jong and Gary to "measure" access platform height (to the floor) in the module
- Angela to check access platform handrail height requirement
- AOB: We will meet in two weeks to focus on MINOS handrail replacement design
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