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<div class="moz-cite-prefix"> At this point we did not make
concrete plans (in money and manpower) for copper <br>
cables and panels going to the counting house, but we do have
conduits to run a limited <br>
number of cables to the counting house. So far there was no
request from any group for such <br>
cables. <br>
For controls of the collimator table and converter, we will need
to install controls somewhere <br>
in the racks in U1 location, preliminary in U1-1 rack according to
1452 in DocDB. <br>
As far as remember there is a cable tray on the north side of the
collimator cave going <br>
into the hall. <br>
I also think rates from any scintillators can be monitored
using discriminator/scaler <br>
modules a couple of which we ordered (and a VME crate) for these
type of applications. <br>
I would suggest that the question how to eventually handle the
cables from the active collimator <br>
needs to be discussed with folks from accelerator division since
they need to run cables <br>
from the analysing device to their magnets. Can this be done in
the hall?<br>
But I guess we should add this capability during this ETC, if
allowed. <br>
<br>
Hovanes.<br>
<br>
On 11/06/2012 12:59 PM, Fernando J Barbosa wrote:<br>
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<blockquote cite="mid:50995011.6070209@jlab.org" type="cite">
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Hi Richard,<br>
<br>
This seems to be a question for controls . The original plan was
to have just fibers going to the counting house, no coax cables
(maybe just a few now).<br>
<br>
Best regards,<br>
Fernando<br>
<br>
<br>
On 11/6/2012 11:51 AM, Richard Jones wrote:
<blockquote cite="mid:50994016.9000408@uconn.edu" type="cite">
<div class="moz-cite-prefix">Hi Fernando,<br>
<br>
The cabling plans that I have seen have focused on detector
subsystems. I don't think we have established plans yet for
beamline related sensors that are not a part of the data
acquisition. Examples of this would be coax cables for video
cameras looking at the radiator target, and background rate
monitor scintillators that we will want placed at various
locations along the beamline. How many of these and where
they will be placed is not fixed yet, but it will be very
useful to have patch panels with connections to the counting
house so we can look at various things when beam is in the
hall. The same thing goes for the collimator cave.
Especially during commissioning it will be useful to have
measurements of background in the cave, and know how things
are changing with beam tune, etc.<br>
<br>
When I was thinking about these things, it struck me that it
would be useful to also be able to view the currents from the
active collimator directly in the counting house, and do the
signal digitization there. This way we do not have to put a
data acquisition crate in the high-radiation area of the
collimator cave and risk it rebooting, etc. Especially during
commissioning this would seem to be useful.<br>
<br>
-Richard J.<br>
<br>
On 11/6/2012 10:14 AM, Fernando J Barbosa wrote:<br>
</div>
<blockquote cite="mid:50992969.7060002@jlab.org" type="cite"> Hi
Richard,<br>
<br>
I have been talking about cables and such for years and you
never requested these. Are these anywhere on the plans? Any
details?<br>
<br>
Best regards,<br>
Fernando<br>
<br>
On 11/6/2012 9:08 AM, Richard Jones wrote:
<blockquote cite="mid:509919F0.8050903@uconn.edu" type="cite">
Hi Fernando,<br>
<br>
I don't know where this request should be routed, so I am
sending it directly to you. I would like to make sure that
we have coaxial connections from the upstream wall of the
collimator cave to the counting house. Here are some
signals that we would like to be able to read directly, and
minimize how much DAq electronics we need to place in a hot
radiation area.<br>
<ol>
<li>output signals from the active collimator: 8</li>
<li>cave background rate monitor scintillators: 2-4</li>
</ol>
<p>A panel of 16 or 24 would be sufficient, I believe.
There are also controls for the collimator translation
stage and associated limit switches. Further downstream
there is the converter target ladder, which may be inside
the cave or outside, depending on the ability to shield
the stray magnetic field from the pair spectrometer. I
just want to make sure we have cables and cable trays for
these interconnects, as it may be difficult to add them
later.<br>
</p>
<p>-Richard Jones<br>
</p>
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