[Halld-tracking-hw] Meeting today

[whitey at jlab.org]

Hi Curtis,

Sorry about not showing for the meeting today. I did not put it on the
calender and had another meeting. I forgot all about it.
Why do you wish to use a bigger oring?

I will discuss your comments below with Beni and Slava and get back with you.

Tim

> Hi Tim and Slava -
>
>     we connected in at 1:00pm, but when no one came on by 1:15, we
> assumed that the
> lab may be closed again today due to weather. We had a few small things
> to reports that
> I think I can safely summarize in an email.
>
> *) With regard to the wires connecting the crimp pins to to the HV
> connector. The
>       system that Slava built will certainly work. In fact any of the
> conducting rubber
>       will work, but we favored the one with the 0.05 hole and the
> thicker wall.
>
> *)  There is a certain risk involved in not holding the conducting
> rubber to the
>        coax with heat shrink cable. In some cases, we have pulled the
> wire out of the
>        conducting rubber during installation. In the limited number that
> we did, we were
>        able to slip the wire back into the conducting rubber and
> complete the connection.
>        However, if we were unable to do this, we would likely be unable
> to connect the
>        straw tube. This failure scenario would not occur if the heat
> shrink tube holds the
>        conducting rubber to the wire. However, it requires increasing
> the size of the hole
>        in the Swiss-cheese plate from 0.138 to 0.156.
>
> *) We would like to investigate a somewhat larger o-ring for the seal,
> but are having trouble
>       determining the size of the one that is currently in use. Can some
> one send us the size
>       of the part?
>
> *)  In looking at the small aluminum screw that compresses the o-ring
> and seals around the
>       wire. While the slot in the top works well for initial tightening,
> after we have soldered
>       the wire to the connector to the board at the top, it is currently
> difficult to tighten the screws
>       if they need to be. This tightening is clearly the first step in
> mitigating gas leaks.
>       Our proposal is to remove the slot at the top and put a 1/4" hex
> head on the part. This allows
>       us to use standard tools to tighten it at all states of the
> installation.
>
> *)  For soldering the wire to the connector board, we feel that a small
> plated-through hole in
>       the pcb board where the HV line solders on would be helpful. This
> would allow us to
>       form a small dog-leg at the end of the wire and use the hole to
> provide some strain relief
>       during soldering. This would require one hole per solder point.
>
> Curtis, Gary & Naomi
>
> --
> Prof. Curtis A. Meyer		Department of Physics
> Phone:	(412) 268-2745		Carnegie Mellon University
> Fax:	(412) 681-0648		Pittsburgh PA 15213-3890
> cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/
>
>
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