Technical Board Meeting Sept 18, 2023

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Technical Board Meeting September 11, 2023 << >> Technical Board Meeting October 16, 2023

Online: see email

Agenda

  • High-density HV patch panel and Counting mode signal connectors (Ciprian Gal, Dustin McNulty); see slides in Docdb:1165
  • Metal seal for dump vacuum connection. See slides in docDB:1166 and Docdb:1161

Minutes

HD connectors :

  • DM: we want to prototype the patch panel with straight bulkhead connectors rather than HD connectors
  • DM: reduces risk, complexity, there is sufficient room on the patch panel so we propose to move away from HD connectors
  • CG: Two major issues in my mind: a) manufacturing these cables with the HD connector will be difficult b) replacing a cable external to the patch panel will require replacing the other 7 good ones as well; internal to the patch panel would require disassembly off the receptacle (making it a very time consuming task)
  • KK: skeptical with the HD connectors and with enough space very comfortable with the individual feedthroughs.
  • RF: the reliability of the HD connectors may be a problem when they are put together.
  • VB: lead time for cables should be taken carefully into consideration.
  • KK: two segments will be prototyped (one FF and one BF) would like to have the patch panels at UMass. DM: that is what we plan to do
  • DM: will take the long cables for Idaho State especially for non-linearity tests
  • JN: cost difference? CG: it looks like the HD connectors for the HV will require approximately 40k$ extra and the Coax will also be higher in price compared to the bulkhead connector solution.
  • KK: has grounding of the patch panel and the connectors been considered? DM: this was discussed with Michael and the signals will be isolated and passed through
  • KK: before we purchase we need to have a review of the specific components (like the bulkhead connectors) to ensure it works properly. The integrating detector meeting will be a good venue for that discussion.
  • All: approve the switch to bulkhead connectors

Dump pipe metal seal:

  • CG: In docDB1166 we make the case that although the EPDM2 dose over the entire run (500krad -> note typo on slide 3) is 4 times less than the limit the areas where this resides provides significant challenges.
  • KK: In my mind we must do it in metal to reduce the risk of vacuum leaks and potential extended experimental downtime. I would even put the limit for such a risk reduction at 50k$.
  • RF: The safety aspect is very important as well since having a metal seal will ensure we don't have to replace it and keep to ALARA principles. Replacing an EPDM ring (even after significant downtime) will still involve work in a high radiation area due to the activation of the dump diffuser.
  • CG: we need to ensure that Hall A doesn't have 2-3 spares already which we can use. KK: we need to make sure they are in pristine condition.
  • All: approve the spending of the 10k$ if suitable spares cannot be identified on site in 2 days.

Attendance

Present:

  • Ciprian Gal (L2 CAM: Infrastructure)
  • Dustin McNulty (Working Group Convener: Integrating Detectors)
  • Jim Napolitano (Working Group Convener: Polarimetry)
  • Ruben Fair (DOE Project Manager)
  • David Armstrong (Elected Executive Board Member)
  • Klaus Dehmelt (Deputy DOE Project Manager)
  • Paul A Souder (Elected Executive Board Member)
  • Krishna Kumar (MOLLER Spokesperson)
  • Vladimir Berdnikov (L2 CAM: Installation)
  • Nilanga Liyanage (Working Group Convener: Tracking Detectors)
  • Juliette Mammei (Executive Board International Representative)


Absent:

  • Kent Paschke, Chair (MOLLER Scientific Coordinator)
  • Mark Pitt (Deputy Spokesperson, MOLLER-NSF Project Coordinator)
  • Jim Fast (DOE Project Manager Emeritus)
  • Michael Gericke (MOLLER-CFI Project Coordinator)
  • Mark Jones (Hall A Leader)
  • Robin Wines (Project Engineer)
  • Dave Meekins (L2 CAM: Target)
  • Mike Dion (L2 CAM: Spectrometer)
  • Carl Zorn (L2 CAM: Detectors)
  • Robert Michaels (L2 CAM: DAQ)
  • Silviu Covrig (Working Group Convener: Target)
  • Caryn Palatchi (Working Group Convener: Polarized Beam)
  • Paul King (Working Group Convener: DAQ)
  • Rakitha Beminiwattha (Working Group Convener: Simulations)
  • Yury Kolomensky (Working Group Convener: Physics Extraction)
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