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Todd,<br>
Thanks for this summary. The latest fOpt looks good in general
and looks very good through Arc3 as you noted. This is great!
the matching process is not resulting in a mess and may actually be
providing a better setup up.<br>
<br>
Today, Inj-group will re-visit the injector. 750MHz team will work
on their hardware. If the 750MHz hardware is repaired they will
ask for beam time. If we could all meet late in the day (4pm'ish)
to discuss the path going forward that would be great. I am OK
with the idea of just taking the quad-scan data and not rematching
except for the hall lines, but on the other hand since the process
appears to be working albeit slower than expected why not push
through to the end?<br>
<br>
Arne<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 03/02/2015 01:40 AM,
<a class="moz-txt-link-abbreviated" href="mailto:satogata@jlab.org">satogata@jlab.org</a> wrote:<br>
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<article id="node-395507" class="node node-logentry article
ia-n clearfix" role="article">
<header class="node-header">
<h1 class="node-title"> <a moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3322725"
rel="bookmark">Summary of empirical matching work so
far</a> </h1>
</header>
<div class="date-vitals">
<p class="author-datetime"> Lognumber <a
moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3322725"
class="lognumber" data-lognumber="3322725">3322725</a>.
Submitted by <a moz-do-not-send="true"
href="https://logbooks.jlab.org/user/satogata">satogata</a>
on <time datetime="2015-03-02T01:38:30-0500"
pubdate="pubdate">Mon, 03/02/2015 - 01:38</time>. </p>
<p class="last-update"> Last updated on <time
datetime="2015-03-02T01:38:46-0500" pubdate="pubdate">Mon,
03/02/2015 - 01:38</time></p>
<table class="field-vitals">
<tbody>
<tr>
<th>Logbooks: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/elog">ELOG</a>
<a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/btlog">BTLOG</a></td>
</tr>
<tr>
<th>Entry Makers: </th>
<td>satogata, roblin</td>
</tr>
<tr>
<th>References: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3322724">3322724
- Fopt to the end</a></td>
</tr>
</tbody>
</table>
</div>
<div class="logentry node-content">
<p>We are matched in the injector (Arne), 1E03 (Mike), and
2E01 (Todd and Yves). The matching process and tools
that we have developed worked in all three locations as
verified with viewer scans and fopts, including a rather
substantial match in 2E where measured Twiss parameters
(particularly in vertical) were quite far off design.</p>
<p>After the 2E match and 2R quads were restored to
design, there was still an fopt C-S bump in the first
horizontal corrector (1E01H) measurement that was
quickly corrected with the 2R02 horizontal beta quad
without affecting other C-S. This is indicative of a
local error in the 2R region; Yves will investigate
separately. This appears as a local spike in the 1E01H
C-S plot.</p>
<p>Existing C-S/ORFP corrections are still in the machine
from 3R onwards, but the upstream machine has been
better matched to them by this matching process. We at
least should perform harp scans at the remaining xE01
locations to measure emittance through the remainder of
the machine, and evaluate any further need for
additional optics corrections.</p>
<p>Things that are working well:<br>
* zigzag scans and tools (no IOCs have needed reboots)<br>
* qsUtility harp scans<br>
* qsUtility emittance/Twiss analysis (but see below for
fitting needs)<br>
* qsUtility matching tool</p>
<p>Things that could use further work:<br>
* zigzag scans cannot be used for emittance/Twiss
analysis (though Dennis is actively working on this)<br>
* harp scan beam size fitting (fitting still needs to be
done by hand for some data sets, then added manually to
the harp scan sdds file for analysis)</p>
<p>We are not nearly as far as we had anticipated on the
white board from Friday planning, but the entire machine
has fopts that are excellent at present (see linked
elog). We believe we have demonstrated that the process
will work, and will work even more efficiently once the
two "further work" items above are addressed -- then
we'll be able to use zigzag to measure emittance and
Twiss parameters quickly in xE01 regions, and calculate
and install match quads with high confidence. In the
meantime we are recommending to the owl shift that they
quad center the spreader quads for us so scans and
matching can continue on Monday, either before or after
injector setup work.</p>
<p>The injector issues are also outstanding, and Yan
believes further work on 3-beam setup needs to be done.
After that work is done, an injector rematch to design
should be all that is needed. This of course is not
visible on a traditional fopt since those are launched
in the 1S/1E region.</p>
</div>
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<pre wrap="">_______________________________________________
BTeam mailing list
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<a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/bteam">https://mailman.jlab.org/mailman/listinfo/bteam</a></pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Arne Freyberger
Director of Accelerator Operations
Jefferson Lab
12000 Jefferson Avenue Cell: (757) 876-6289
Postal Suite 19 Email: <a class="moz-txt-link-abbreviated" href="mailto:freyberg@jlab.org">freyberg@jlab.org</a>
Newport News, VA 23606 </pre>
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