<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Hi All,<br>
<br>
Chuck will bring Fernando's models into the 3D model and we can
discuss this tomorrow or early next week.<br>
<br>
Tim<br>
<br>
Fernando J Barbosa wrote:
<blockquote cite="mid:4FAB3D94.3040106@jlab.org" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
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">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
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>
-------- Original Message --------
<table class="moz-email-headers-table" border="0"
cellpadding="0" cellspacing="0">
<tbody>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject:
</th>
<td>Re: [Halld-pid] Fwd: ST readout update</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date:
</th>
<td>Wed, 09 May 2012 17:49:09 -0400</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">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>
</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></td>
</tr>
</tbody>
</table>
<br>
<br>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
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">
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
from Fernando<br>
<br>
-------- Original Message --------
<table class="moz-email-headers-table" border="0"
cellpadding="0" cellspacing="0">
<tbody>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject:
</th>
<td>ST readout update</td>
</tr>
<tr>
<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>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Halld-pid mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:Halld-pid@jlab.org">Halld-pid@jlab.org</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/halld-pid">https://mailman.jlab.org/mailman/listinfo/halld-pid</a></pre>
</blockquote>
<br>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Halld-pid mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:Halld-pid@jlab.org">Halld-pid@jlab.org</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/halld-pid">https://mailman.jlab.org/mailman/listinfo/halld-pid</a></pre>
</blockquote>
<br>
</blockquote>
</body>
</html>