[Clas12tdg] Rack location meeting

[George Jacobs]

Hi Dave,

    Yes, this should not be too bad. I will need to know the cable tray 
lengths from the space frame to the detectors, those 4 trays should be 
the same length. A fifth cable way is required to bring the R2-3 S5-6 
signal cables to the detectors. This  cable tray/way will run under the 
new platform. Here is a link to the planned cable layout I did a while back.

http://www.jlab.org/~jacobsg/CLAS12-DC-cables.pdf

Obviously, the cable trays are specific to the sectors they supply, so 
these racks need to be as close to the trays as feasible.

I do not know the signal cable lengths, can some one supply that info? 
We will not know the actual HV cable lengths until we measure that is 
left of them.I do not know what the original lengths of the HV cables 
were, can some one supply that info? That will be the max length, so, 
all but 6 cables will be shorter than  that.

The DCLV racks can be located anywhere because they are not limited by 
cable lengths.

--George


David Kashy wrote:
> 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 
>>> 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
>>>
>>>
>>>
>>>
>>>
>
>
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
>

-- 
George Jacobs
TJNAF
12000 Jefferson Ave.
Newport News, VA 23606

(office)757-269-7115
(FAX)757-269-5577
(cell) 757-876-0480
(pager) 757-584-7115

(email) jacobsg at jlab.org

http://www.jlab.org/~jacobsg

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/clas12tdg/attachments/20100915/f48d7f24/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 61297 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/clas12tdg/attachments/20100915/f48d7f24/attachment-0006.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 28197 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/clas12tdg/attachments/20100915/f48d7f24/attachment-0007.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 56235 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/clas12tdg/attachments/20100915/f48d7f24/attachment-0008.png>