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

[Hovanes Egiyan]

   At this point we did not make concrete plans (in money and manpower) 
for copper
cables and panels going to the counting house, but we do have conduits 
to run a limited
number of cables  to the counting house. So far there was no request 
from any group for such
cables.
   For controls of the collimator table and converter, we will need to 
install controls somewhere
in the racks in U1 location, preliminary in U1-1 rack according to 1452 
in DocDB.
As far as remember there is a cable tray on the north side of the 
collimator cave going
into the hall.
    I also think rates from any scintillators can be monitored using 
discriminator/scaler
modules a couple of which we ordered (and a VME crate) for these type of 
applications.
   I would suggest that the question how to eventually handle the cables 
from the active collimator
needs to be discussed with folks from  accelerator division since they 
need to run cables
from the analysing device to their magnets.  Can this be done in the hall?
   But I guess we should add this capability during this ETC, if allowed.

Hovanes.

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
>>>>
>>>
>>
>
>
>
> _______________________________________________
> Halld-tagger mailing list
> Halld-tagger at jlab.org
> https://mailman.jlab.org/mailman/listinfo/halld-tagger

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/halld-tagger/attachments/20121106/ed48ec33/attachment.html