[Halld-pid] Fwd: ST readout update

[Simon Taylor]

I've been working on implementing the start counter into the simulation 
and to do so I needed a drawing of the region of the beam line near the 
target.  This drawing shows a 6" ID aluminum beam pipe within a few 
centimeters of the upstream end of the start counter.   At the end of 
this beam pipe is a conical section that slopes down to the radius of 
the target vessel.   In fact the start counter appears to rest on (or 
come very close to) part of the beam pipe in this region.   Unless I am 
not understanding some aspect of the geometry, it looks like the ST2 
board cannot fit in the region indicated by the drawing on the last page 
of Fernando's document as drawn.  Furthermore there is only about 2 cm 
clearance between the inner shell of the cdc and the 6" beam pipe.

Simon



On 05/09/2012 09:45 AM, Mark M. Ito wrote:
> from Fernando
>
> -------- Original Message --------
> Subject: 	ST readout update
> Date: 	Wed, 09 May 2012 00:53:41 -0400
> From: 	Fernando J Barbosa <barbosa at jlab.org>
> To: 	halld-pid at jlab.org, "Mark M. Ito" <marki at jlab.org>, Werner 
> Boeglin <boeglinw at fiu.edu>, Chuck Hutton <huttonc at jlab.org>
> CC: 	Fernando J. Barbosa <barbosa at jlab.org>, Elton Smith 
> <elton at jlab.org>, Eugene Chudakov <gen at jlab.org>, Tim Whitlatch 
> <whitey at jlab.org>, Fernando J. Barbosa <barbosa at jlab.org>
>
>
>
> Hi all,
>
> I have attached an update on the ST readout. Please review and provide
> feedback.
>
> We have received the first set of SiPMs (50 um) and I plan to send the
> PCBs for fab by the end of this week. I am planning to get two sets
> assembled (50 um) by the end of the month with one set to be shipped to
> Werner. Similar assemblies will be provided for the 100 um units once
> these arrive.
>
> The designs of these PCBs (ST1 and ST2) are intended to be the final
> implementations. The prototype ST3 PCB is only intended for the
> prototype tests and the final version will be installed in a chassis
> which will be located upstream of the target. We will need to determine
> its location soon.
>
> Chuck, I need to know the length of cable (micro-coax ribbon cable
> assembly) needed to connect the ST2 to the chassis so we can order it
> for the tests.
>
> Best regards,
> Fernando
>
>
>
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