<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi Dave,<br>
<br>
Yes, this should not be too bad. I will need to know the cable tray
lengths from the space frame to the detectors, those 4 trays should be
the same length. A fifth cable way is required to bring the R2-3 S5-6
signal cables to the detectors. This cable tray/way will run under the
new platform. Here is a link to the planned cable layout I did a while
back.<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.jlab.org/~jacobsg/CLAS12-DC-cables.pdf">http://www.jlab.org/~jacobsg/CLAS12-DC-cables.pdf</a><br>
<br>
Obviously, the cable trays are specific to the sectors they supply, so
these racks need to be as close to the trays as feasible. <br>
<br>
I do not know the signal cable lengths, can some one supply that info?
We will not know the actual HV cable lengths until we measure that is
left of them.I do not know what the original lengths of the HV cables
were, can some one supply that info? That will be the max length, so,
all but 6 cables will be shorter than that.<br>
<br>
The DCLV racks can be located anywhere because they are not limited by
cable lengths.<br>
<br>
--George<br>
<br>
<br>
David Kashy wrote:
<blockquote cite="mid:4C90D780.60800@jlab.org" type="cite">George,
<br>
This is a great question. To help understand the general design of
CLAS12 we did some concept work a couple of years back. We came up with
4 cable trays from the magnet to the space frame that were at 2, 4, 8
and 10 o'clock. These are on shown on the attached pictures. We needed
to keep the cable trays off the top center of the beamline to allow
access for the crane and HTCC. If helpful we could add another at 6
oclock below the subway level...
<br>
<br>
To my knowledge no one has looked into cable lengths in detail. Can you
help with this?
<br>
<br>
Dave
<br>
<br>
<br>
George Jacobs wrote:
<br>
<blockquote type="cite">Hi All,
<br>
<br>
Do we have anything showing the proposed cable tray locations for the
detectors? The DC signal and HV cable lengths are fixed, so we need to
make sure the locations will work with those lengths. What is the exact
distance, well +\- 10% is likely OK, that these cables need to go from
the rack location to reach the detectors? If we choose rack locations
without knowing the path length, the cables may not work.
<br>
<br>
Thank you,
<br>
George
<br>
<br>
David Kashy wrote:
<br>
<blockquote type="cite">Hi All,
<br>
If you received this mail via clas12tdg then you are on the mailing
list.
<br>
If you did not then please subscribe to it by going to the following
web site.
<br>
<a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/clas12tdg">https://mailman.jlab.org/mailman/listinfo/clas12tdg</a>
<br>
<br>
Now that this is done, here is the harder part.
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
Levels 1 and 3 are pretty clear and should be clear to all of you.
<br>
<br>
I hope we can get lots of info before this meeting. Please help!
<br>
<br>
<br>
Thanks
<br>
Dave
<br>
<br>
<br>
<br>
<br>
<br>
</blockquote>
</blockquote>
<br>
<br>
<hr size="4" width="90%"><br>
<center><img src="cid:part1.01000503.01090407@jlab.org"></center>
<p><br>
</p>
<hr size="4" width="90%"><br>
<center><img src="cid:part2.04040103.09080701@jlab.org"></center>
<p><br>
</p>
<hr size="4" width="90%"><br>
<center><img src="cid:part3.01060409.08010305@jlab.org"></center>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
George Jacobs
TJNAF
12000 Jefferson Ave.
Newport News, VA 23606
(office)757-269-7115
(FAX)757-269-5577
(cell) 757-876-0480
(pager) 757-584-7115
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
<a class="moz-txt-link-freetext" href="http://www.jlab.org/~jacobsg">http://www.jlab.org/~jacobsg</a></pre>
</body>
</html>