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Has this version of ORFP actually been released? Should I use the
DRAFT version for JTABS?<br>
<br>
<div class="moz-cite-prefix">On 03/28/2014 03:40 PM,
<a class="moz-txt-link-abbreviated" href="mailto:freyberg@jlab.org">freyberg@jlab.org</a> wrote:<br>
</div>
<blockquote cite="mid:20140328194004.A265429B10@logbooks.jlab.org"
type="cite">
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<div class="htmlmail-body">
<h1> <a moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3277931"
rel="bookmark">Supplemental LASO log</a>
</h1>
<div class="date-vitals">
<p class="author-datetime"> Lognumber <a
moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3277931"
class="lognumber" data-lognumber="3277931">3277931</a>.
Submitted by <a moz-do-not-send="true"
href="https://logbooks.jlab.org/user/freyberg">freyberg</a>
on <time datetime="2014-03-28T15:37:18-0400"
pubdate="pubdate">Fri, 03/28/2014 - 15:37</time>. </p>
</div>
<div class="date-vitals">
<table class="field-vitals">
<tbody>
<tr>
<th>Logbooks: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/btlog">BTLOG</a></td>
</tr>
<tr>
<th>Attached Files: </th>
<td>
<div><span class="file"><img class="file-icon" alt=""
title="application/pdf"
src="cid:part5.07070606.09020709@jlab.org"><a
href="imap://erb@mail.jlab.org:993/fetch%3EUID%3E/INBOX%3E144068?header=quotebody&part=1.1.2.3&filename=optics_restore_proc_13b2.pdf"
type="application/pdf; length=461175"
title="optics_restore_proc_13b2.pdf">Latest ORFP
procedure </a></span></div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="node-content">
<p>Arrived this morning to relieve Tiefenback and Yves who
worked over night to establish a sound setup. They had a
good steup through pass-2, but were stuck at that point due
momentum instability. Upon arrival they were in the middle
of dealing with this periodic energy changes when I arrived
and the source proved difficult to identify. The RF-power
guru's arrived at 7am and identified a railed cavity 1L02-2
that had no phase control. With this repaired dispersion/CS
tuning resumed and progress in completely pass-3 by noon was
almost accomplished. </p>
<p>I benefited greatly from the work of Yves and Mike (and all
the rest who have gotten us to this point), specifically
they identified that *too strong* of an RF kick during
dispersion minimization. To get the required kicks, they
instructed me to only use *1* RF cavity during fOpt and
30Hz. This tended to yield consistent results between fOtp
and real-time 30Hz, which was very comforting to me. </p>
<p>At one point in the process, an old veriosn of ORFP made
its way into my hands and some time was lost working with
the *wrong knobs*! Please make sure you are working from
Rev. 13b2 of ORFP (attached). Do not use an older version,
do not rely on the color coding of the screens. </p>
<p>Even with the correct knobs, I found it very challenging to
get the CS match into Arc6. Dispersion suppression went
smoothly, but there was no traction on CS X or Y with the
nominal knobs. I then made the decision to move forward
without a CS match into Arc6, reasoning a mis-match in Arc6
is after the fact. I am wiling to entertain arguments as to
why this is the worst decision in the history of 12GeV
CEBAF. </p>
<p>We then move to the Hall-A dumplette, we found the line was
in a totally mis-configured state, supplies off, magnets
off-loop, magnets mis-configured. We steered up the line,
put LAM1C on design. Minimized steerers as best as possible.
And started a documentation effort, all-saves, viewer tour,
aperature check.<br>
At the time of this writing, an aperture check to the Hall-A
dumplete is in progress. Lots of transverse aperture, energy
aperature data is being collected now.</p>
<p>Several times this afternoon, trucks travelling down the
South Linac trip off the C100s in the South very
frustrating. but for the most part the Accelerator has been
up more than it has been down!!!! This has been absolutely
crucial to making progress. </p>
<p>At 3pm I met with the Hall-A users. The tentative plan is
to continue our effort, if we can re-establish beam to
Hall-A by midnight, they have a program that can use less
than 10microAmperes over night. Saturday, if we are in a
position to support it, we will see how high we can go with
CW. Sunday Owl, Hall-A will be back to low beam current.
Sunday day the Hall would like to do Moeller, so in the
morning the LASO (Joe Grames) will assist/lead setting the
Wien Filter and after that the hall will start the Moller
program. This means Yves will have to come in well before
his nominal Swing Supplemental Shift. I hope we will be in a
position to not need Supplemental LASO on Sunday Swing, if
not I need a volunteer.</p>
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