<html>
<head>
</head>
<body text="#000000" bgcolor="#FFFFFF">
<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>
</blockquote>
<br>
</body>
</html>