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-------- Original Message --------
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Subject: </th>
<td>Re: Tagger detectors</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date: </th>
<td>Sun, 02 May 2010 13:32:37 -0400</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">From: </th>
<td>Larry Weinstein <a href="mailto:weinstei@jlab.org"><weinstei@jlab.org></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">To: </th>
<td>Eugene Pasyuk <a href="mailto:pasyuk@jlab.org"><pasyuk@jlab.org></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">CC: </th>
<td>Dave Kashy <a href="mailto:kashy@jlab.org"><kashy@jlab.org></a>, tpe <a href="mailto:tpe@jlab.org"><tpe@jlab.org></a></td>
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<pre>Dear Eugene,
Our initial estimates (which should be good to a factor 2 or 3) are 5-6
mega-rads for the E counters (all of them).
The reason hall access would be useful would be see if there are any
other options to individually removing the counters, such as shielding
them or moving the entire frame. I am not familiar with the geometry
and have no idea what the possibilities are.
- Larry
Eugene Pasyuk wrote:
> Larry,
>
> Do you have a dose estimate as we discussed last time?
>
> Removal of the scintillators of E-counters is highly undesirable. The
> glue joint between the scintillator and fibers is fragile, especially
> after sitting there for 15 years. I am afraid when we touch them they
> will fall apart. So, it is absolutely essential to have a dose
> estimate before we do anything with the tagger. If the dose is
> acceptable, then we will just leave them alone. If the dose is to
> high, then we have to think what to do.
>
> -Eugene
>
> P.S. Why do you think we need an access to the Hall for this discussion?
>
> On 4/30/10 4:47 PM, Larry Weinstein wrote:
>> Dear Dave and Eugene,
>>
>> I would like to discuss with you how best to protect or remove the
>> tagger detectors during the TPE run. Please let me know the best time to
>> do this. It would be best if we had access to the hall at that time.
>>
--
Sincerely,
Larry
-----------------------------------------------------------
Lawrence Weinstein
University Professor
Physics Department
Old Dominion University
Norfolk, VA 23529
757 683 5803
757 683 5809 (fax)
<a href="mailto:weinstein@odu.edu">weinstein@odu.edu</a>
<a href="http://www.physics.odu.edu/~weinstei">http://www.physics.odu.edu/~weinstei</a>
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