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Hi Fernando,<br>
<br>
Thanks for pushing these procurements through. I am looking
particularly at the Bcal and Fcal requirements, but some of my
comments are more general:<br>
<br>
1. Belden 9907 is listed in the Belden catalog as RG58/U type (not
RG58A/U).<br>
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.<br>
2a. Labels for the Fcal cables should be coordinated with the Fcal
cables and labeling which already exists at IU. <br>
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. <br>
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.<br>
5. Quantities of Bcal and Fcal cables are correct. <br>
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).<br>
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.<br>
<br>
Cheers, Elton.<br>
<pre class="moz-signature" cols="72">Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite #16
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax </pre>
<br>
On 5/23/11 11:04 PM, Fernando J. Barbosa wrote:
<blockquote cite="mid:4DDB204F.9030207@jlab.org" type="cite">Dear
colleagues,
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
Thanks in advance and best regards,
<br>
Fernando
<br>
<pre wrap="">
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