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Hello Xiaochao,<br>
<br>
It could be that I sent you an older drawing. The original drawing
didn't cover the full area, but I thought I had that changed.<br>
<br>
Paul<br>
<br>
<div class="moz-cite-prefix">On 4/5/13 3:37 PM, Xiaochao Zheng
wrote:<br>
</div>
<blockquote
cite="mid:4ca6772f-f8d8-4b3f-88b6-a23ac9b61420@zstore2.jlab.org"
type="cite">
<pre wrap="">Hi Zhiwen:
looking at Paul's endplate layout design I don't see why you need from 85 to 240cm. Can you elaborate? I have attached Paul's drawing which is from about 100 to 250cm. It's for both SIDIS and PVDIS. For SIDIS I suppose only the portion from 100 to 220cm will be filled.
Xiaochao
----- Original Message -----
From: "Zhiwen Zhao" <a class="moz-txt-link-rfc2396E" href="mailto:zwzhao@jlab.org"><zwzhao@jlab.org></a>
To: "Xiaochao Zheng" <a class="moz-txt-link-rfc2396E" href="mailto:xiaochao@jlab.org"><xiaochao@jlab.org></a>
Cc: <a class="moz-txt-link-abbreviated" href="mailto:jinhuang@jlab.org">jinhuang@jlab.org</a>, "solid ec" <a class="moz-txt-link-rfc2396E" href="mailto:solid_ec@jlab.org"><solid_ec@jlab.org></a>
Sent: Wednesday, April 3, 2013 4:59:05 PM
Subject: Re: [Solid_ec] SoLID EC meeting at 10am tomorrow
After seeing the layout of Hexagon, I think we should try to use SPD to
cover all the EC area from 85 to 240cm in next round of background
simulation.
To estimate the seperation now, Jin can just use the fitting formula and
extrapolate to these values and we should have a rough number for IHEP.
Zhiwen
On 4/3/2013 9:14 AM, Xiaochao Zheng wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I agree with Jin on the first topic.
On th second, the IHEP cost could depend on the size and the shape of the Sc pad. The size could also be limited by their production facility.
Xiaochao
Hi, Zhiwen,
Thanks for the comment. My reply would be following
</pre>
<blockquote type="cite">
<pre wrap="">Another idea is do 120 segmentation all in fan shape instead of 60 fan
</pre>
</blockquote>
<pre wrap="">with two section.
Did we exclude that?
My understanding from previous discussion is YES. One important reason is
that 60x2 segmentation have better scintillator pad to shower
correspondence. For example, in 120x1 segments, the inner width of the
module is half of the width of one calorimeter module. Therefore, when one
inner calorimeter was triggered, two segments in in scintillator will be
checked in trigger level, which effectively reduced it to 60 segments.
</pre>
<blockquote type="cite">
<pre wrap="">Either way, I think WLS fiber is a preferred way to readout so that we
</pre>
</blockquote>
<pre wrap="">don't need worry about light propagation and PMT in field.
</pre>
<blockquote type="cite">
<pre wrap="">For realistic EC layout, I think the SPD inner radius needs to be around
</pre>
</blockquote>
<pre wrap="">85cm and outer 240cm So where exact the separation of the two sections
exists is only an rough estimation. I don't think IHEP really needs it now.
Your background simulation only covered R = 100-220 cm, which is consistent
with forward calorimeter size in our write up too. If in final layout you
find the scintillator need to be larger, please update both.
And I agree that this change should NOT matter at this stage as well as for
communication to IHEP.
Cheers
Jin
__________________________________________
Jin HUANG
Los Alamos National Laboratory
PO Box 1663, MS H846, Los Alamos, NM 87545
Office:(505) 665-2523, Cell:(757) 604-9946
__________________________________________
-----Original Message-----
From: Zhiwen Zhao [<a class="moz-txt-link-freetext" href="mailto:zwzhao@jlab.org">mailto:zwzhao@jlab.org</a>]
Sent: Tuesday, April 02, 2013 2:08 PM
To: <a class="moz-txt-link-abbreviated" href="mailto:jinhuang@jlab.org">jinhuang@jlab.org</a>
Cc: 'Xiaochao Zheng'; 'solid ec'
Subject: Re: [Solid_ec] SoLID EC meeting at 10am tomorrow
Another idea is do 120 segmentation all in fan shape instead of 60 fan with
two section.
Did we exclude that?
Either way, I think WLS fiber is a preferred way to readout so that we don't
need worry about light propagation and PMT in field.
For realistic EC layout, I think the SPD inner radius needs to be around
85cm and outer 240cm So where exact the separation of the two sections
exists is only an rough estimation. I don't think IHEP really needs it now.
Zhiwen
On 4/2/2013 11:48 AM, Jin Huang wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi Xiaochao,
Following our discussion, I am writing to suggest radial segmentation
for SIDIS forward photon-rejection scintillator pad.
The rate VS R distribution was shown on page 7 of the last
collaboration meeting talk. It can be well parameterized with
Rate = E^(11.0391 - 0.0212754*R)*R Hz/cm^2
Therefore, if we require equal rate on the two radial segments of
scintillator pad, the division will be 100-137 cm and 137-220 cm.
Cheers,
Jin
__________________________________________
Jin HUANG
Los Alamos National Laboratory
PO Box 1663, MS H846, Los Alamos, NM 87545
Office:(505) 665-2523, Cell:(757) 604-9946
__________________________________________
-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:solid_ec-bounces@jlab.org">solid_ec-bounces@jlab.org</a> [<a class="moz-txt-link-freetext" href="mailto:solid_ec-bounces@jlab.org">mailto:solid_ec-bounces@jlab.org</a>] On
Behalf Of Xiaochao Zheng
Sent: Monday, April 01, 2013 2:15 PM
To: solid ec
Subject: [Solid_ec] SoLID EC meeting at 10am tomorrow
Dear All:
This is a reminder that we will have our weekly SoLID EC meeting
tomorrow at 10am.
Call in instruction is as follows:
US 866-740-1260 International 303-248-0285 Access code: 8206694
JLab people should meet in room L102.
Cheers,
Xiaochao
----------------------------------------------------------------------
------ Associate Professor, Department of Physics, University of
Virginia
382 McCormick Rd, Charlottesville, VA 22904
Telephone: (434) 243-4032 (during academic year); or (757) 810-2885
(summer)
Homepage: <a class="moz-txt-link-freetext" href="http://people.virginia.edu/~xz5y/Main.html">http://people.virginia.edu/~xz5y/Main.html</a>
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</pre>
</blockquote>
<pre wrap="">
</pre>
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</pre>
</blockquote>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
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