[Halld-jlab] Cable Length - Final Check

[Elton Smith]

Hi Fernando,

Thanks for pushing these procurements through. I am looking particularly 
at the Bcal and Fcal requirements, but some of my comments are more general:

1. Belden 9907 is listed in the Belden catalog as RG58/U type (not RG58A/U).
2. Labels: At the time cables are ordered, we should also have them 
labeled. It is much easier to have quality labels attached at the time 
they are fabricated because the connector is not yet on, and this allows 
for sturdy labels to be placed without going over the connector. I 
believe you already have labeling scheme which has been reviewed and 
could be used for all cables, although it might be useful to check the 
labels one last time. It is also useful to include the length of the 
cable on the label.
2a. Labels for the Fcal cables should be coordinated with the Fcal 
cables and labeling which already exists at IU.
3. Discussion on spares: We should consider the strategy here, and 
comments/suggestions are welcome.  In the final installation we will 
want all cables to be correctly labeled. Therefore, at the very least, 
when a "spare" is installed its label will need to be updated to match 
its function. We also have several lengths of cables of RG-58, although 
the RG-59 cables are all 55'. It might make sense for the RG-58 cables 
to simply order uncut cable,  connectors and labels that can be 
installed as required. That allows the additional cable to be used for 
any need that arises (including ones/twos connections that are not on 
the list). For the RG-59 one could order spares of the 55' length, but 
uncut rolls again provides flexibility.
4. RG-59 type cable. Belden 8281F does not have a fire rating in my 
catalog (is it CL2?) This particular cable also has a fairly large 
diameter (0.305"), so the SHV connector will of course need to match it.
5. Quantities of Bcal and Fcal cables are correct.
5a. There are no HV cables for Bcal, but what about the required LV 
cables? Will they be purchased from another list? (We do not want them 
to fall between the cracks).
6. I would like Chuck (or designate) to review all the dimensions in the 
tables once again and check that nothing has changed. For example, it 
may be that the detailed design of the Bcal readout may have some effect 
on the actual lengths. (The lengths were of course determined long 
before we have detailed the geometry of the Bcal readout). There may 
have changes to the geometry for other systems as well.

Cheers, Elton.

Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite #16
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax


On 5/23/11 11:04 PM, Fernando J. Barbosa wrote:
> Dear colleagues,
>
> We have already reviewed the cable specs over a year ago. As I am 
> starting procurement of all these cables, I find it opportune to ask 
> you to perform a final check.
>
> I have attached a file that shows the cable lengths (actual), 
> connectors at each end and quantities for each detector subsystem. 
> Please let me know if there are any discrepancies before I submit the 
> PR by the end of this week.
>
> The procurements for the items in green are complete and the cables 
> for the collimator are not defined at this time and will be procured 
> at a later date.
>
> Thanks in advance and best regards,
> Fernando
>
>
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