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Hi Sung,<br>
I don't know why there is a downstream, CH2 shoulder in the g9a
spectrum, but not in the g9b. The simplest answer is that we used
more super-insulation in g9a. I do not think this is the case, but
I will check our notes when I can.<br>
<br>
Chris<br>
<br>
<div class="moz-cite-prefix">On 3/14/13 11:01 AM, Park, Sungkyun
wrote:<br>
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<div id=":l7">Hi Keith,<br>
<br>
Thank about your comment. I will update your comment in my
presentation. However, If the shoulder of the CH2 target in
g9a data is from the super-insulation on the 20K shield, why
we can not see any shoulder in CH2 vertex distribution of
g9b data or additional peak near the CH2 peak?<br>
<br>
Sung</div>
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<div style="direction: ltr;" id="divRpF339417"><font
color="#000000" face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:frost-bounces@jlab.org">frost-bounces@jlab.org</a> [<a class="moz-txt-link-abbreviated" href="mailto:frost-bounces@jlab.org">frost-bounces@jlab.org</a>] on behalf
of Christopher Keith [<a class="moz-txt-link-abbreviated" href="mailto:ckeith@jlab.org">ckeith@jlab.org</a>]<br>
<b>Sent:</b> Thursday, March 14, 2013 10:20 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:frost@jlab.org">frost@jlab.org</a><br>
<b>Subject:</b> Re: [Frost] The hydrogen contamination pf
the carbon target in g9a data<br>
</font><br>
</div>
<div>Hi Sungkyun,<br>
The 12.5 cm peak that you see in the g9b spectrum is
probably due to superinsulation (SI) on the downstream end
of the 1K shield. In g9a, a similar quantity of SI was used,
but it was pressed against the carbon target and is probably
visible as the slight shoulder at 7cm on the carbon peak.<br>
<br>
In g9a there is a similar shoulder on the CH2 at 17cm, and
this may also be due to SI on the 20K shield. I don't see
the corresponding shoulder in the g9b spectra, though. I'll
look at our notes.<br>
<br>
Chris Keith<br>
<br>
<div class="moz-cite-prefix">On 3/13/13 5:38 PM, Park,
Sungkyun wrote:<br>
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<div style="direction:ltr; font-family:Tahoma;
color:#000000; font-size:10pt">Hi Eugene,<br>
<br>
I made the presentation using the Keith pictures to have
better understanding about the hydrogen contamination. I
think this can be the good reference to discuss our
current issue "hydrogen contamination in the carbon
target"<br>
<br>
<a moz-do-not-send="true"
href="http://hadron.physics.fsu.edu/%7Eskpark/document/FROSTM_Mar1313.pdf"
target="_blank">
hadron.physics.fsu.edu/~<wbr>skpark/document/FROSTM_<wbr>Mar1313.pdf</a><br>
<br>
In slide 1, the carbon and CH2 target in g9a vertex
have shoulders downstream and there are new peak between
carbon and CH2 target in g9b vertex. Our current
conclusion may be the peak between the carbon and CH2
target is from the super-insulation and this
super-insulation make the shoulder part in the carbon
data. However, there is no description about the should
of the CH2 target.<br>
<br>
I think that (E)outer vacuum can, (D)20K heat shield,
and (B)1K heat shield in Figure 3.6 in slide 1 are used
in g9a and g9b together. I think the vertex difference
between theg9a and g9b is from the holding magnet with
the different size.<br>
If so, we can not find any reason for the CH2 shoulder
part because the CH2 target is installed out the 20K
heat shield.<br>
<br>
Can I update this presentation on our FROST meeting
web-page?<br>
<br>
Sung<br>
Florida State University<br>
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<pre class="moz-signature" cols="72">--
_____________________________________________________________
Christopher D. Keith
Jefferson Lab email: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:ckeith@jlab.org" target="_blank">ckeith@jlab.org</a>
12000 Jefferson Ave. ph: 757-269-5878
Postal Suite 6 fax: 757-269-5235
Newport News, VA 23606
_____________________________________________________________</pre>
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<pre class="moz-signature" cols="72">--
_____________________________________________________________
Christopher D. Keith
Jefferson Lab email: <a class="moz-txt-link-abbreviated" href="mailto:ckeith@jlab.org">ckeith@jlab.org</a>
12000 Jefferson Ave. ph: 757-269-5878
Postal Suite 6 fax: 757-269-5235
Newport News, VA 23606
_____________________________________________________________</pre>
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