[Clas12tdg] Rack location meeting

[Mac Mestayer]

... also, remove 4 HV racks from level 2 -Mac

"mestayer at jlab.org", (757)-269-7252

On Thu, 16 Sep 2010, Steve Christo wrote:

> 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
>>> 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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