[Halld-jlab] [GlueX] Cable Length - Final Check

Wed May 25 10:48:53 EDT 2011

Hi Zisis,

Thanks for the feedback. My comments follow and also on my reply to Elton.

Zisis Papandreou wrote:
> Hi Fernando:
>
> thanks to Elton for checking the numbers for the calorimeters.  For 
> the BCAL1920=ADC(768 inner + 384 outer)+ TDC(768 inner), so it is 
> correct. 
>
> Elton, what you propose makes sense to me.  Maintaining the the 
> correct labels even after a cable is replaced is important with so 
> many people working on the experiment and it minimizes confusion and 
> makes checking the cabling straight forward.  I guess Matt can comment 
> on having consistent cabling names for the FCAl blocks, but it seems 
> common sense to me.  
>
> Labels: are we requesting they be put on at the vendor?  What is the 
> cost?  Is it worthwhile/do we have manpower to buy a labeller and do 
> it ourselves after the connectors are on?  We have to do this for 
> replacements anyway and I am guessing you guys might even have a 
> labeller.  The labels should be robust, clear to read (boldface), with 
> ink that will not fade.  Cable length info on the label (in meters or 
> better yet nanoseconds) is a good idea.  Can we get different colour 
> cables (as long as cost does not increase) for ADCs, TDCs, HV, LV?

We have a quality labeler and there is a nice variety of label 
materials/colors/sizes. Self-laminating and heat-shrink are popular. The 
cost for the vendor to put on these labels would be considerable because 
the labels would not be sequential and would require a bit more labor. 
Although cables of different colors are listed by some manufacturers, 
these would require a special order. So, we will have black for the 
RG-58 types and red for the RG-59 types (HV) (LV cables will also have 
standards colors as available from the manufacturers). We can, however, 
have different colors for the labels as we have for the FDC and the CDC 
signal cables.

Thanks and best regards,
Fernando

>
> Cheers, Zisis...
>
>
> On 2011-05-25, at 7:39 AM, Elton Smith wrote:
>
>> 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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>
> ---
> Prof. Zisis Papandreou, Ph.D., P.Phys.
> Department of Physics   |  tel.:  (306) 585-5379
> University of Regina     |  fax.:  (306) 585-5659
> Regina, SK  S4S 0A2     |  email:  zisis at uregina.ca 
> <mailto:zisis at uregina.ca>
> Web:  http://web.me.com/zisis/professional/
>
>
>
>
>
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