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from Fernando, in response to Simon<br>
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<td>Re: [Halld-pid] Fwd: Re: Fwd: ST readout update</td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">Date: </th>
<td>Thu, 10 May 2012 00:01:24 -0400</td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">From: </th>
<td>Fernando J Barbosa <a class="moz-txt-link-rfc2396E" href="mailto:barbosa@jlab.org"><barbosa@jlab.org></a></td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:halld-pid@jlab.org">halld-pid@jlab.org</a>, Simon Taylor <a class="moz-txt-link-rfc2396E" href="mailto:staylor@jlab.org"><staylor@jlab.org></a>,
Chuck Hutton <a class="moz-txt-link-rfc2396E" href="mailto:huttonc@jlab.org"><huttonc@jlab.org></a>, "Mark M. Ito"
<a class="moz-txt-link-rfc2396E" href="mailto:marki@jlab.org"><marki@jlab.org></a></td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">CC: </th>
<td>Tim Whitlatch <a class="moz-txt-link-rfc2396E" href="mailto:whitey@jlab.org"><whitey@jlab.org></a>, "Fernando J.
Barbosa" <a class="moz-txt-link-rfc2396E" href="mailto:barbosa@jlab.org"><barbosa@jlab.org></a></td>
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Hi Simon,<br>
<br>
The outer diameter of the pipe is indeed 6.125" (155mm) but the
readout resides in the area just before this pipe (between the start
counter and the 6.125" pipe). I did not show the pipe in my drawing
but the readout length of 2.112" resides interely in such area. Only
the cables go over the pipe.<br>
<br>
Chuck, Mark, please clarify these dimensions and also the length of
the cable to the upstream area.<br>
<br>
Thanks and best regards,<br>
Fernando<br>
<br>
<br>
<br>
On 5/9/2012 6:10 PM, Simon Taylor wrote:
<blockquote cite="mid:4FAAEB38.8040203@jlab.org" type="cite">
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Actually, I think the clearance is even less than the 2 cm I
stated in my previous message -- it's more like 1 cm. I have
attached the drawing that James Lagner sent me and my
approximation of the geometry in GEANT.<br>
<br>
Simon<br>
<br>
<br>
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<td>Re: [Halld-pid] Fwd: ST readout update</td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">Date: </th>
<td>Wed, 09 May 2012 17:49:09 -0400</td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">From: </th>
<td>Simon Taylor <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:staylor@jlab.org"><staylor@jlab.org></a></td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">To: </th>
<td><a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:halld-pid@jlab.org">halld-pid@jlab.org</a></td>
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<br>
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I've been working on implementing the start counter into the
simulation and to do so I needed a drawing of the region of the
beam line near the target. This drawing shows a 6" ID aluminum
beam pipe within a few centimeters of the upstream end of the
start counter. At the end of this beam pipe is a conical section
that slopes down to the radius of the target vessel. In fact the
start counter appears to rest on (or come very close to) part of
the beam pipe in this region. Unless I am not understanding some
aspect of the geometry, it looks like the ST2 board cannot fit in
the region indicated by the drawing on the last page of Fernando's
document as drawn. Furthermore there is only about 2 cm clearance
between the inner shell of the cdc and the 6" beam pipe.<br>
<br>
Simon<br>
<br>
<br>
<br>
On 05/09/2012 09:45 AM, Mark M. Ito wrote:
<blockquote cite="mid:4FAA74E6.2090103@jlab.org" type="cite">
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from Fernando<br>
<br>
-------- Original Message --------
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cellpadding="0" cellspacing="0">
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">Subject:
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<td>ST readout update</td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">Date:
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<td>Wed, 09 May 2012 00:53:41 -0400</td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">From:
</th>
<td>Fernando J Barbosa <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:barbosa@jlab.org"><barbosa@jlab.org></a></td>
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<th valign="BASELINE" align="RIGHT" nowrap="nowrap">To: </th>
<td><a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:halld-pid@jlab.org">halld-pid@jlab.org</a>,
"Mark M. Ito" <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:marki@jlab.org"><marki@jlab.org></a>,
Werner Boeglin <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:boeglinw@fiu.edu"><boeglinw@fiu.edu></a>,
Chuck Hutton <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:huttonc@jlab.org"><huttonc@jlab.org></a></td>
</tr>
<tr>
<th valign="BASELINE" align="RIGHT" nowrap="nowrap">CC: </th>
<td>Fernando J. Barbosa <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:barbosa@jlab.org"><barbosa@jlab.org></a>,
Elton Smith <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:elton@jlab.org"><elton@jlab.org></a>,
Eugene Chudakov <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:gen@jlab.org"><gen@jlab.org></a>,
Tim Whitlatch <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:whitey@jlab.org"><whitey@jlab.org></a>,
Fernando J. Barbosa <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:barbosa@jlab.org"><barbosa@jlab.org></a></td>
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<pre>Hi all,
I have attached an update on the ST readout. Please review and provide
feedback.
We have received the first set of SiPMs (50 um) and I plan to send the
PCBs for fab by the end of this week. I am planning to get two sets
assembled (50 um) by the end of the month with one set to be shipped to
Werner. Similar assemblies will be provided for the 100 um units once
these arrive.
The designs of these PCBs (ST1 and ST2) are intended to be the final
implementations. The prototype ST3 PCB is only intended for the
prototype tests and the final version will be installed in a chassis
which will be located upstream of the target. We will need to determine
its location soon.
Chuck, I need to know the length of cable (micro-coax ribbon cable
assembly) needed to connect the ST2 to the chassis so we can order it
for the tests.
Best regards,
Fernando
</pre>
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