[Clas12tdg] Rack location meeting

[David Kashy]

George,
This is a great question. To help understand the general design of 
CLAS12 we did some concept work a couple of years back. We came up with 
4 cable trays from the magnet to the space frame that were at 2, 4, 8 
and 10 o'clock.  These are on shown on the attached pictures. We needed 
to keep the cable trays off the top center of the beamline to allow 
access for the crane and HTCC. If helpful we could add another at 6 
oclock below the subway level...

To my knowledge no one has looked into cable lengths in detail. Can you 
help with this?

Dave


 George Jacobs wrote:
> Hi All,
>
> Do we have anything showing the proposed cable tray locations for the 
> detectors? The DC signal and HV cable lengths are fixed, so we need to 
> make sure the locations will work with those lengths. What is the 
> exact distance, well +\- 10% is likely OK, that these cables need to 
> go from the rack location to reach the detectors? If we choose rack 
> locations without knowing the path length, the cables may not work.
>
> Thank you,
> George
>
> 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 
>> 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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