[Clas12tdg] Rack location meeting

[Steve Christo]

Hi Dave,
We devoted our DC meeting today to the rack locations for the system 
with Sergey present. The general plan is as follows:

1) Abandon all DC rack locations on Space Frame Level 2.
2) Remove 8 HV racks from Level 1.
3) Add 12 HV racks (more HV channels) to locations under the Subway 
Level. These could be divided into 2 groups of 6, for example.
4) Keep 4 to 4-1/2 racks on each of the North and South sides of Space 
Frame Levels 1 and 3 to accommodate the signal and relocated low voltage 
racks .

As you suggested, we will try to identify the DC rack locations in the 
3D model and work with one of the designers to identify them with a 
different color than the others.
Steve

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 
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>> If you did not then please subscribe to it by going to the following 
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>> 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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