[Clas12tdg] Rack location meeting

[David Kashy]

Hi All,
Unfortunately the meeting was preempted by Lehmann talk preperations.

I know the DC group had an extended discussion about this subject.
Also the SVT guys have discussed taking over some abandoned racks of the 
DC guys.
What about other detectors?
Youri, Vitali, Micro Megas (Amrit & co),

Sergey,  can you mark up the slides from previous mails and show where 
we need to put each systems racks by color code or labeling the racks on 
the CAD model. If you can not will each system owner print out a set of 
these pictures and mark which racks you want for your system. Once all 
requests are made we can try to settle this issue!

We need to move on this so as not to delay the CLAS12 magnets.

Thanks
Dave



David Kashy wrote:
> 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,
>> If you received this mail via clas12tdg then you are on the mailing 
>> list.
>> If you did not then please subscribe to it by going to the following 
>> web site.
>> https://mailman.jlab.org/mailman/listinfo/clas12tdg
>>
>> 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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