[Halld-tracking-hw] Meeting today

[Curtis A. Meyer]

On 12/20/10 2:49 PM, whitey at jlab.org wrote:
> 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?

The one that is there feels a little undersized in the hole. We want to 
investigate
different sizes.

   curtis
> 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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>>
>


-- 
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/