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

[Chuck Hutton]

I have left Fernando a message about coming to my desk to discuss.

Chuck

On 5/10/2012 8:32 AM, Tim Whitlatch wrote:
> Hi All,
>
> Chuck will bring Fernando's models into the 3D model and we can 
> discuss this tomorrow or early next week.
>
> Tim
>
> Fernando J Barbosa wrote:
>> 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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