[Halld-pid] Fwd: Re: Fwd: Re: Fwd: ST readout update

[Mark M. Ito]

from Fernando, in response to Simon

-------- Original Message --------
Subject: 	Re: [Halld-pid] Fwd: Re: Fwd: ST readout update
Date: 	Thu, 10 May 2012 00:01:24 -0400
From: 	Fernando J Barbosa <barbosa at jlab.org>
To: 	halld-pid at jlab.org, Simon Taylor <staylor at jlab.org>, Chuck Hutton 
<huttonc at jlab.org>, "Mark M. Ito" <marki at jlab.org>
CC: 	Tim Whitlatch <whitey at jlab.org>, "Fernando J. Barbosa" 
<barbosa at jlab.org>



Hi Simon,

The outer diameter of the pipe is indeed 6.125" (155mm) but the readout 
resides in the area just before this pipe (between the start counter and 
the 6.125" pipe). I did not show the pipe in my drawing but the readout 
length of 2.112" resides interely in such area. Only the cables go over 
the pipe.

Chuck, Mark, please clarify these dimensions and also the length of the 
cable to the upstream area.

Thanks and best regards,
Fernando



On 5/9/2012 6:10 PM, Simon Taylor wrote:
> Actually,  I think the clearance is even less than the 2 cm I stated 
> in my previous message -- it's more like 1 cm.    I have attached the 
> drawing that James Lagner sent me and my approximation of the geometry 
> in GEANT.
>
> Simon
>
>
> -------- Original Message --------
> Subject: 	Re: [Halld-pid] Fwd: ST readout update
> Date: 	Wed, 09 May 2012 17:49:09 -0400
> From: 	Simon Taylor <staylor at jlab.org>
> To: 	halld-pid at jlab.org
>
>
>
> 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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>
>
>
>
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