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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 --------
<table class="moz-email-headers-table" border="0" cellpadding="0"
cellspacing="0">
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<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject:
</th>
<td>ST readout update</td>
</tr>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Wed, 09 May 2012 00:53:41 -0400</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">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>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">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 align="RIGHT" nowrap="nowrap" valign="BASELINE">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>
</tr>
</tbody>
</table>
<br>
<br>
<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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