[Halld-tracking-hw] [GlueX] Hall D cables

[Yves Van Haarlem]

Hi Fernando,

>> - What about cables for pre-amp test signals? As the LV cabling still has 
>> to come and LV + test signals end in a single connector on the HV board, we 
>> assume test signals will be done together with the LV.
> The Amphenol cable has 25 pairs and one pair is used for the test signal 
> which is generated on the fADC125.
I am confused: the signal coming from the preamp is differential. so I 
thought you need 24 pairs for the signals + at least 1 single lead 
(probably one pair) for ground, so there is no room for the test signal? 
Or what is the grounding scheme?

Cheers,
 	Yves






>
> Thanks for the feedback.
>
> Best regards,
> Fernando
>
>
>
>
>> 
>> Cheers,
>>     Yves
>> 
>> 
>>
>>                           /--------------------------------
>>                          /   Yves Van Haarlem
>>        _--~~--_         /
>>      /~/_|  |_\~\      /      Carnegie Mellon University
>>     |____________|    /        Department of Physics
>>     |[][][][][][]|:= /          Wean Hall room 8404
>>   __| __         |__ \            Pittsburgh, PA 15213
>>  |  ||. |   ==   |  | \           USA
>> (|  ||__|   ==   |  |) \
>>  |  |[] []  ==   |  |   \           Tel.:   +1 412 268-6949
>>  |  |____________|  |    \                  +1 412 641-9252
>>  /__\            /__\     \          Fax.: +1 412 681-0648
>>   ~~              ~~       \-----------------------------------
>> 
>> On Sat, 13 Mar 2010, Fernando J. Barbosa wrote:
>> 
>>> Hello everyone,
>>> 
>>> I have attached a pdf with a list of signal and HV cables for use in Hall 
>>> D. This list will be later expanded to include the LV and optical fiber 
>>> cables and it will form the basis of a formal specifications document. The 
>>> cables listed connect the various detector sub-systems to instrument 
>>> racks.
>>> 
>>> The cable lengths, with routing allowances for trays and racks, have been 
>>> checked with the Hall D mechanical group; the suggested actual length of 
>>> the cables have been rounded up to allow grouping among different 
>>> sub-systems and minimize cost and part numbers. The nominal cable rating 
>>> is NEC UL CL2 and cable part numbers are suggested.
>>> 
>>> The types of connectors (no actual part numbers at this time) are included 
>>> for the source and destination (the readout modules use Lemo-style 
>>> connectors).
>>> 
>>> Due to accelerated procurement initiatives by the 12GeV management team, I 
>>> am requesting the following information and feedback, where appropriate, 
>>> by the end of next week (3/19/2010) from the collaboration and from the 
>>> various detector subsystems:
>>> 
>>> 1. Cable type & ratings (with anticipated HV operation levels of PMTs, for 
>>> example)
>>> 2. Length
>>> 3. Connector types (source and destination)
>>> 
>>> My plan is as follows:
>>> 
>>> 1. Request info/feedback from collaboration (this)
>>> 2. Finalize specifications document
>>> 3. Submit formal specifications document to Dianne (12GeV Integration) for 
>>> submission to the JLab Electrical Safety Committee and approval
>>> 4. Outline procurement plan with the JLab procurement dept.
>>> 5. Procure cable assemblies from vendors.
>>> 
>>> I note that some detectors are not completely defined for the final 
>>> configuration in the hall but the number of cables from these detectors is 
>>> relatively small. I would appreciate if you could provide information as 
>>> to the procurement readiness for such sub-systems.
>>> 
>>> Thanks for your prompt feedback in advance.
>>> 
>>> Best regards,
>>> Fernando
>>> 
>