[Clas12tdg] Rack location meeting

[David Kashy]

Hi All,
Here is more to think about especially with regard to the central detector.

One must know how close we can be to the Solenoid so the stray field 
does not effect the electronics.

should we attempt to make all the detectors always connected to their 
electronics?
For TOF in CLAS I know we connect and disconnect all the time. I don't 
think this causes much of a problem. For other types of detectors I'm 
not sure how big a deal it is, and I'm not sure if CLAS12 is more sensitive.

For Primex we had a nice solution that allowed motion of the HYCAL about 
3-4 m in Y, 1m in X and 2m in Z. I'm sure most of you know it but you 
can see pictures for a reminder at:

http://www.jlab.org/~tilles/miniT/Hycal%20Production%20Run/P1040139.JPG
http://www.jlab.org/~tilles/miniT/Hycal/P1030870.JPG
http://www.jlab.org/~tilles/miniT/Hycal/P1030871.JPG

What we did was to make bundles of ~50 cables inside stainless steel 
braided sleeves. This allowed a cleaner system even though we needed to 
have more than 2000 cables connected to HYCAL and have it remotely 
moveable with out people checking the cables. It worked. For CLAS12 we 
can have people there to help with the motion so it could be easier...

Any way , It might be possible to have the racks and cables for the 
central detector on L3.

Take a look at the attached slides and think about this concept please.

Thanks
Dave


David Kashy wrote:
> Hi All,
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>
> Now that this is done, here is the harder part.
>
> At todays TDG meeting we had some discussion about rack locations for 
> 12GeV. We need to get started on this issue and firstly need to 
> resolve the location for the two new super conducting magnet rack 
> sets. In total we need 3 racks worth of space for each magnet for the 
> vendors equipment and we also need up to one full rack for each for 
> our part of the controls.  The Dump resistors must be installed near 
> the power supplies.
>
> I guess I need to know from each detector physicist the location and 
> number of racks needed for each system. Also if you have a plan for 
> removing un-needed racks that are already installed or emptying the 
> equipment from them.
>
> Attached are 4 pictures that show each level of the space frame at 
> present we have shown only 3 racks on the subway level, but we could 
> probably add 2 more on the north side.
>
> On level 2 for some reason the racks on the south side for the 
> cryotarget have not been modeled, but those need to stay so it is not 
> a big deal now.
>
> Levels 1 and 3 are pretty clear and should be clear to all of you.
>
> I hope we can get lots of info before this meeting. Please help!
>
>
> Thanks
> Dave
>
>
>

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