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

[Fernando J Barbosa]

Hi Elliott, all,

  My responses follows:


On 11/6/2012 2:56 PM, Elliott Wolin wrote:
> 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.

Yes, that's the way to go.

>
> 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.

Of course this would be terrible from a grounding stand point but it 
should be OK if one just wants to check for some anomalies, for example.


> 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.

This should be put on the ETC now. We have space in the upstream level 1 
racks, if needed.

Best regards,
Fernando


>
>
>
>
> 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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