[Dsg-hallc_nps] [EXTERNAL] Re: Re: NPS HV cabling/connector questions

[Brad Sawatzky]

Hi Carlos,

Just a friendly ping on the SAMTEC issue/questions.

All the best,
-- Brad

On Thu, 30 Jul 2020, Brad Sawatzky wrote:

> Ah, now I understand why the SAMTEC part numbers were for a double ended
> assembly.  They were copy-pasted from the internal grey HV connections
> between the large PCB and the inside patch panel connection. (ie. slide
> 12 on the PDF you link to below).
> 
> OK, it'll be good to hear Thi's comments on the HV specs for those
> larger SAMTEC connectors.  Thanks.
> 
> More details models/specs on the internal cabling would be appreciated,
> but things are already making more sense to me now.
> 
> -- Brad
> 
> On Thu, 30 Jul 2020, Carlos Munoz Camacho wrote:
> 
> > Dear Brad,
> >    thanks for the detailed documentation of the several points. I had
> > misunderstood which SAMTEC connectors you were referring to (I thought you
> > were referring to the ones attached to the PMTs, and not the ones at the top
> > of the box).
> > I will check the safety specs of this with the engineer who designed the
> > cables and the boards (Thi). Unfortunately he's away on vacations until Aug
> > 17, but I'll get back to you then. All cables and panels are fabricated now.
> > But if we find a safety issue, we will of course reconsider things.
> > Concerning the CAD drawing, I can send that to you next week when Emmanuel
> > will be back at the lab. In the meantime, you could see in page 11 (left)
> > of [1]https://wiki.jlab.org/cuawiki/images/7/7e/ERR_Calorimeter.pdf a layout
> > of the boards. The HV is distributed through the flat cables at the top of
> > the board (and connected to the top of the box). The HV then goes out
> > through FISCHER connectors on the right side of the PCB board and fed to the
> > PMT voltage divider through another (smaller) SAMTEC connector (the one I
> > thought you were referring to). Let me know if you would need more details
> > (other than a better quality/zoom version of that). I should be able to
> > provide the routing of the PCB board if you need.
> > Thanks,
> > Carlos
> > On Thu, Jul 30, 2020 at 8:44 PM Brad Sawatzky <[2]brads at jlab.org> wrote:
> > 
> >   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 <[3]brads at jlab.org>  -<>-  Jefferson Lab / Hall C /
> >   C111
> >   Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager:
> >   [4]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
> > 
> > References
> > 
> >    Visible links
> >    1. https://wiki.jlab.org/cuawiki/images/7/7e/ERR_Calorimeter.pdf
> >    2. mailto:brads at jlab.org
> >    3. mailto:brads at jlab.org
> >    4. mailto:brads-page at jlab.org
> 
-- 
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