[Dsg-hallc_nps] NPS HV cabling/connector questions

[Brad Sawatzky]

Hi Carlos,

Just a few questions to follow up on the SAMTEC connector and long HV
cable issues.

Just so we're working off the same page, the information I'm going off
of is noted in these attachments: 
  1. NPS_Cables_Transparents.pdf
     - See p.6 -- p.8 for the SAMTEC part numbers, and the pin map from
       the Radiall connector <--> SAMTEC connector group.

  2. SAMTEC-*.pdf
     - SAMTEC catalog pages for the PMSD cable assemblies, and the
       discrete IPBD connectors, etc.

  3. NPS_frame_connector_layout.pdf
     - A simple CAD render of the patch-panel(s) on the exterior of the
       NPS chassis.

  4. NPS-cabling-inside-chassis_25Jun2019.pdf
     - CAD render of the interior of the NPS detector chassis


The 'PMSD-XX-206-K-D-LUS' called out in [1] are technically complete
cable assemblies (double-ended, including wire).  AFAICT, the relevant
discrete connectors are the IPBD units.

Either way, the PMSD and IPBD connectors are only rated to 600 VDC, but
the production HV is around 1100V.  There is a comment on the SAMTEC
assembly document that they hi-pot the cable assembly to 1000V as part
of the QA, so it is *possible* that these parts could be OK, but it'll
certainly require some kind of safety review, at minimum.  (See
documents in [2].)

Has procurement and fabrication of the HV patch panel on the NPS roof in
[3] already begun?  Are we locked into that design, or is there still a
window to redesign that patch panel around different connectors, if
needed?

Can you send a more detailed assembly/design model that shows how the
internal HV connections inside the NPS box are are laid out?  That is,
some shop drawings or zoomed CAD images that show connections from the
PMTs to the green panel area in [4], and from the green panel area to
the interior HV patch panel on the roof (ie. grey cables in [4]).

-- Brad

-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
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