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

[Tim Whitlatch]

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
>>>
>>>
>>>
>>> _______________________________________________
>>> Halld-pid mailing list
>>> Halld-pid at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/halld-pid
>>
>>
>>
>>
>> _______________________________________________
>> Halld-pid mailing list
>> Halld-pid at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/halld-pid
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/halld-pid/attachments/20120510/e82047e3/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: whitey.vcf
Type: text/x-vcard
Size: 131 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/halld-pid/attachments/20120510/e82047e3/attachment-0002.vcf>