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<h1>
<a href="https://logbooks.jlab.org/entry/3277931" rel="bookmark">Supplemental LASO log</a>
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Lognumber <a href="https://logbooks.jlab.org/entry/3277931"></a><a href="https://logbooks.jlab.org/entry/3277931" class="lognumber" data-lognumber="3277931">3277931</a>. Submitted by <a 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>
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<table class="field-vitals"><tr><th>Logbooks: </th><td><a 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:3c1691931d45d3431f5ce0314a3969bb" /><a href="cid:310ae01d69a16b6a3cf5b61efb4db8b0" type="application/pdf; length=461175" title="optics_restore_proc_13b2.pdf">Latest ORFP procedure </a></span></div></td></tr></table></div>
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<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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