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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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<br>
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<pre wrap="">_______________________________________________
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<br>
<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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