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Hi all,<br>
<br>
See my comments attached. Cheers, Elton.<br>
<pre class="moz-signature" cols="72">Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite #16
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax </pre>
<br>
On 12/13/11 11:54 AM, Mark M. Ito wrote:
<blockquote cite="mid:4EE78333.2000300@jlab.org" type="cite">
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Folks,<br>
<br>
Yesterday Beni sent out an email summarizing thinking on the
choice of phototubes for the TOF (see below).<br>
<br>
Recall that there is a problem with PMT lifetime for the high rate
counters near the beamline, especially at 10^8 photons/s. The
choice of PMT's is central to how we deal with this problem. <br>
<br>
Please have a look. He is asking for feedback so that we can make
a decision soon.<br>
<br>
-- Mark<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>[Halld-pid] PMT choice for TOF</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Mon, 12 Dec 2011 12:01:22 -0500</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>Beni Zihlmann <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:zihlmann@jlab.org"><zihlmann@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>,
Elton Smith <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:elton@jlab.org"><elton@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>Dear colleagues,
In order to make a final decision on the choice and strategy with regard to
the PMTs for the TOF I put together a few facts and findings and ask for
your
opinion.
Please read the attached outline set in 4 main paragraphs:
Purpose, Facts, Calculations and Strategies
I am advocating strategy a) where we go with a two phase approach.
Let me know what you think and what makes the most sense. Depending
on your answers we will either take a decision right away or I will call
for a meeting at end of this week (beginning next) so that we can take a
decision on this matter before Christmas.
thanks everybody,
Beni
</pre>
<br>
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