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</style><article id="node-401258" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3328473" rel="bookmark">Hall A Status update -- Friday PM</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3328473" class="lognumber" data-lognumber="3328473">3328473</a>. Submitted by <a href="https://logbooks.jlab.org/user/brads">brads</a> on <time datetime="2015-03-20T15:20:07-0400" pubdate="pubdate">Fri, 03/20/2015 - 15:20</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr></table></div>
<div class="logentry node-content">
<p>The accelerator continues to have difficulties that complicate beam delivery. There have been 1 or 2 small squirts of beam, but nothing useful.</p>
<p>Beam loss (BLM) trips continue to be a problem in the 7S, 9S region as well at 1C12 in the Hall A arc. I gather there are ideas on how to address those, but there are bigger problems been addressed at the moment...</p>
<p>The east arc heat exchanger problem was worked on for a full shift yesterday. Some parts were replaced and the system is functioning again, but it is still somewhat marginal. Machine recovery Thursday swing did not go well -- there were significant optics problems starting at the injector with impacts throughout the machine. MCC spent SWING, OWL and a good part of Friday DAY working these issues. Other issues include: a persistant 30s beam energy oscillation of unknown origin and a number of minor hardware failures. To top it off, the CHL crashed this afternoon (recovery is presently ongoing).</p>
<p>On the upside, Hall A has the clear priority now and and OPS is focussed on (a) getting the machine up and running, and (b) delivering as much CW beam to Hall A as soon as they can without worring about the other Halls. This may include turning off the RF separation and magnetically separating beam for Hall A only (which would prohibit delivery to Hall D over the weekend).</p>
<p>Bottom line: Accelerator is struggling but Hall A is the priority -- we need to be ready for beam when it arrives.</p>
<p>[ There are a lot of empty shifts coming up early next week (and a few this weekend!) -- please sign up ASAP: <a href="https://misportal.jlab.org/mis/apps/physics/shiftSchedule/index.cfm?experimentRunId=HALLA-FALL2014">https://misportal.jlab.org/mis/apps/physics/shiftSchedule/index.cfm?expe...</a> ]</p>
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