[Halld-tagger] request for patch panel from collimator cave

[Elliott Wolin]

Hi,

Our thinking from way back is to avoid running signals to the counting 
house.  Instead we would connect internet-controllable scopes to the 
signals and view the output in the counting house.

Also, the lab prefers to use internet cameras instead of video.  With 
these we can place a camera anywhere there is ethernet access, which is 
everywhere.

Fernando can comment on potential grounding problems associated with 
running copper from e.g. the collimator cave to the counting house.  The 
baseline DAQ doesn't include a DAQ crate in the collimator cave, I 
assume Richard refers to a monitoring crate.  If such monitoring is 
needed we can discuss how we might do this.




On 11/06/2012 12:59 PM, Fernando J Barbosa wrote:
> Hi Richard,
>
> This seems to be a question for controls . The original plan was to 
> have just fibers going to the counting house, no coax cables (maybe 
> just a few now).
>
> Best regards,
> Fernando
>
>
> On 11/6/2012 11:51 AM, Richard Jones wrote:
>> Hi Fernando,
>>
>> The cabling plans that I have seen have focused on detector 
>> subsystems.  I don't think we have established plans yet for beamline 
>> related sensors that are not a part of the data acquisition.  
>> Examples of this would be coax cables for video cameras looking at 
>> the radiator target, and background rate monitor scintillators that 
>> we will want placed at various locations along the beamline.  How 
>> many of these and where they will be placed is not fixed yet, but it 
>> will be very useful to have patch panels with connections to the 
>> counting house so we can look at various things when beam is in the 
>> hall.  The same thing goes for the collimator cave.  Especially 
>> during commissioning it will be useful to have measurements of 
>> background in the cave, and know how things are changing with beam 
>> tune, etc.
>>
>> When I was thinking about these things, it struck me that it would be 
>> useful to also be able to view the currents from the active 
>> collimator directly in the counting house, and do the signal 
>> digitization there.  This way we do not have to put a data 
>> acquisition crate in the high-radiation area of the collimator cave 
>> and risk it rebooting, etc.  Especially during commissioning this 
>> would seem to be useful.
>>
>> -Richard J.
>>
>> On 11/6/2012 10:14 AM, Fernando J Barbosa wrote:
>>> Hi Richard,
>>>
>>> I have been talking about cables and such for years and you never 
>>> requested these. Are these anywhere on the plans? Any details?
>>>
>>> Best regards,
>>> Fernando
>>>
>>> On 11/6/2012 9:08 AM, Richard Jones wrote:
>>>> Hi Fernando,
>>>>
>>>> I don't know where this request should be routed, so I am sending 
>>>> it directly to you.  I would like to make sure that we have coaxial 
>>>> connections from the upstream wall of the collimator cave to the 
>>>> counting house.  Here are some signals that we would like to be 
>>>> able to read directly, and minimize how much DAq electronics we 
>>>> need to place in a hot radiation area.
>>>>
>>>>  1. output signals from the active collimator: 8
>>>>  2. cave background rate monitor scintillators: 2-4
>>>>
>>>> A panel of 16 or 24 would be sufficient, I believe.  There are also 
>>>> controls for the collimator translation stage and associated limit 
>>>> switches.  Further downstream there is the converter target ladder, 
>>>> which may be inside the cave or outside, depending on the ability 
>>>> to shield the stray magnetic field from the pair spectrometer.  I 
>>>> just want to make sure we have cables and cable trays for these 
>>>> interconnects, as it may be difficult to add them later.
>>>>
>>>> -Richard Jones
>>>>
>>>
>>
>
>
>
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-- 

				Sincerely,
					Elliott


================================================================================


  Those raised in a morally relative or neutral environment will hold
		    no truths to be self-evident.
				

Elliott Wolin
Staff Physicist, Jefferson Lab
12000 Jefferson Ave
Suite 8 MS 12A1
Newport News, VA 23606
757-269-7365

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