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Hi,<br>
<br>
Our thinking from way back is to avoid running signals to the
counting house. Instead we would connect internet-controllable
scopes to the signals and view the output in the counting house.<br>
<br>
Also, the lab prefers to use internet cameras instead of video.
With these we can place a camera anywhere there is ethernet access,
which is everywhere.<br>
<br>
Fernando can comment on potential grounding problems associated with
running copper from e.g. the collimator cave to the counting house.
The baseline DAQ doesn't include a DAQ crate in the collimator cave,
I assume Richard refers to a monitoring crate. If such monitoring
is needed we can discuss how we might do this.<br>
<br>
<br>
<br>
<br>
On 11/06/2012 12:59 PM, Fernando J Barbosa wrote:
<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>
</blockquote>
<br>
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<br>
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<br>
<br>
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<pre class="moz-signature" cols="72">--
Sincerely,
Elliott
================================================================================
Those raised in a morally relative or neutral environment will hold
no truths to be self-evident.
Elliott Wolin
Staff Physicist, Jefferson Lab
12000 Jefferson Ave
Suite 8 MS 12A1
Newport News, VA 23606
757-269-7365
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