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</style><article id="node-448892" 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/3376075" rel="bookmark">RC Status update (Saturday)</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3376075" class="lognumber" data-lognumber="3376075">3376075</a>. Submitted by <a href="https://logbooks.jlab.org/user/brads">brads</a> on <time datetime="2016-02-06T12:35:54-0500" pubdate="pubdate">Sat, 02/06/2016 - 12:35</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr><tr><th>Tags: </th><td><a href="https://logbooks.jlab.org/tag/shiftsummary">ShiftSummary</a></td></tr></table></div>
<div class="logentry node-content">
<p>A rough punchlist first, followed by the tentative plan for the next few days.
</p>
<hr /><strong>Exec summary</strong>
<hr /><ul><li><strong>NOTE: As we have started taking beam it is <em>CRITICAL</em> that no one
modifies/tests/perturbs any production system (DAQ, BCM, Raster signals,
detector, trigger control files, prescales, etc...) without consulting
experts and <span style="text-decoration: underline;">always</span> making a halog entry.</strong>
<ul><li>Please leave all Counting House shift computers in a clean state for
the next shift crew (No non-mission-critical web browsers, PDF files,
terminal windows cluttering screens, etc.)
</li><li><strong><em>How about we make a friendly rule that violators buy donuts/snacks for the next Shift Crew?</em></strong>
</li></ul></li><li>Hall was in Controlled Access most of Friday DAY, now taking CW beam
<ul><li>Jack fixed the Right and Left Arm dipole control/regulation issues
</li><li>RHRS DAQ deadtime problem solved
<ul><li>NOTE: RHRS should stay at 0.75GeV for now (as planned; don't mess with it)
</li></ul></li><li>other opportunistic checks while waiting for MCC to need our Hall
</li></ul></li><li>MCC started tuning up our Hall mid-SWING shift, then worked Hall B and other
issues throughout OWL (no real beam to Hall A)
<ul><li>Note that it will likely be a rocky weekend as MCC works on tuning up Hall
B and establishing stable 3-Hall operation.
</li></ul></li><li>We started receiving useful CW this morning (Saturday DAY) and began our
checkout program
</li><li>We will run 2-pass beam through the weekend, focusing primarily on beamline
instrumentation checkout and opportunistic detector work
<ul><li>5 uA CW limit on all solid targets (since target is warm)
</li><li>We have the go-ahead to do a 'rough' BCM calibration up to 30--40uA
<ul><li>No target (ie. Home position)
</li><li>Don't spend much time pressing the higher currents, the machine isn't
very stable yet. Just set the high-limit to the point that the machine
will allow for now.
</li></ul></li></ul></li><li>more details below...
</li></ul><hr /><strong>Hall Punchlist</strong>
<hr /><ul><li>Everyone needs to read and sign the COO/ESAD/RSAD in the Counting House
<ul><li>See also <a href="https://logbooks.jlab.org/entry/3375013">https://logbooks.jlab.org/entry/3375013</a>
</li></ul></li><li>Harp scanner checkout [Buddhini, Brad]
<ul><li>Brad had a meeting with Software and Hardware folks on Friday. Short
summary is that all the harps looked good (full test w/ fake signal) as of
Jan 11, 2016. The test in early February was motion-only for most of the
harps, so the signals flagged as weird are /not/ necessary a problem.
</li><li>1H04A/B harps <em>were</em> tested with fake signal in Feb and look good
</li><li>There is an intermittent bug with the 'Harp Analyzer' tool where it will
plot the wrong trace sometimes. Check the 'Harp History' tool to confirm
if the trace is really bad.
</li><li>See also: <a href="https://logbooks.jlab.org/entry/3376057">https://logbooks.jlab.org/entry/3376057</a>
</li></ul></li><li>CODA EPICS logging still has a few missing/dead variables(?) [Alex, et al]
</li><li>A few Shift Checklist and documentation issues were noted [Julie volunteered to fix these]
<ul><li>VDC readback howto information is inconsistent/out-of-date
</li></ul></li><li>Right VDC gas flows not showing up on General Tools screen (dead readbacks) [Jack]
</li><li>Raster issues/questions
<ul><li>Raster scope disappeared from middle room in Counting House
<ul><li>how do we visually monitor the raster currents now?
</li><li>more updates to shift 'howtos' needed if scope is gone for good
</li></ul></li><li>New Raster offset attenuators installed, made no difference(?) [Barak]
</li><li>Possible swapping of raster signal to DAQ mapping [Barak]
<ul><li><a href="https://logbooks.jlab.org/entry/3375810">https://logbooks.jlab.org/entry/3375810</a>
</li></ul></li></ul></li><li>Position, Energy, Current locks (and FFB) status unclear [MCC, Brad]
<ul><li>MCC informed and working on it
</li></ul></li><li>BPM issue from Fall should be corrected [Buddhini, Thir, Kijun, Pete Francis]
<ul><li>it's a little unclear if there are other issues...
</li><li>this will be a priority checkout when we get beam
</li></ul></li><li>Plan to move the LRHS to 25 degrees (verify) first thing Tuesday and then
get it surveyed during Beam Studies [Brad]
</li><li>RHRS VDC gas flow readbacks dead [Segal]
</li><li>Arc scanner needs to be greased/oiled [Doug]
<ul><li>motion does work though, just makes a bad noise...
</li></ul></li><li>Arc Scanner Harp controls [new screen] does not work
</li><li>103 kHz clock needs to be plugged into the DVCS DAQ at next access [Alex]
</li><li>Old (1 MHz) D1 BCM seems to drift, not clear if this is a serious problem or
if the drift is just below the region of relevance for that (high-current)
readback. [Kijun, Mack, et al]
</li><li>Need to verify that the alarm handlers all make noise (ie. audible alarm)
<ul><li>LeCroy HV controls [Kijun]
</li><li>Target ALH
</li><li>Hall A general ALH
</li></ul></li><li>An updated Hall A BCM average current screen that uses the new BCM readouts
has been requested, OPS/SW working on it [Brad, Kjeldsen, Alex]
</li><li>RHRS dipole showing some puzzling readbacks
<ul><li>It's OK at 0.75 GeV, but we should not change momentum without talking to Jack
</li></ul></li><li>Significant issue with Moller target [Sasha, Roman]
<ul><li>target position/angle shifts when magnet ramped up, can not maintain alignment
</li><li>troubleshooting should be pursued during Friday DAY shift and have plan
ready for follow up during planned downtime on Mon/Tues
</li></ul></li></ul><hr /><strong>Completed Punchlist Items (new)</strong>
<hr />
- RHRS DAQ deadtime problem solved [Alex, Bob, et al]
- HRS Magnet issues solved (mostly)! [Segal]
<ul><li>See <a href="https://logbooks.jlab.org/entry/3375822">https://logbooks.jlab.org/entry/3375822</a>
</li><li>Left Q1 has limit of 1800A, but <em>stay below 1600A</em> for time being
<ul><li>We need to ensure shift crew have appropriate instructions on how to set
the LHRS momentum correctly given this limitation.
</li></ul></li><li>Right Q1 <em>is</em> working: 800 A software limit
</li><li>RHRS should stay at 0.75GeV for now
- BCM readouts are reported to be working [Alex, Musson, Mack, Ciprian]
</li><li>need to keep an eye on this though...
</li></ul><hr /><strong>Tentative plan for the near term -- detailed daily runplans to come</strong>
<hr />
2-pass beam to Hall A over this weekend and we'll scratch the Compton Chicane
requirement (just go straight through). See below for more details. As usual,
the farther in the future, the fuzzier the forecast...
<p><span style="text-decoration: underline;">Saturday DAY -- Sunday OWL</span>
</p>
<ul><li>2-pass beam, NO Compton chicane
</li><li>See also: <a href="https://logbooks.jlab.org/entry/3375847">https://logbooks.jlab.org/entry/3375847</a>
</li><li>Initial RHRS settings: P0 = 0.75 GeV/c, Angle = 48.75
<ul><li>Do NOT change the RHRS setting without contacting RC
</li></ul></li><li>Initial LHRS settings: P0 = 1.4 GeV/c, Angle = 38.64
</li><li>Sieve plates: OFF
</li><li>Tasks will include (see <a href="https://hallaweb.jlab.org/wiki/index.php/Beamline">https://hallaweb.jlab.org/wiki/index.php/Beamline</a> )
<ul><li>Ion chamber calibration (need ensure MCC follows the new procedure) [MCC, Brad]
</li><li>Establish energy, position and current locks (and FFB) [MCC]
</li><li>Beam centering and BPM/Raster checks
</li><li>BPM calibration vs Harps ("Bull's Eye Scan")
</li><li>Rough BCM calibration (cross calibration Hall A BCMs vs Unser only, no FC2; non-invasive to other Halls)
</li><li>Start detector checkout and calibration studies
<ul><li>LHRS / DVCS checkout
</li><li>RHRS checkout:
<a href="https://hallaweb.jlab.org/wiki/index.php/HRS_Checkout_(Experts)">https://hallaweb.jlab.org/wiki/index.php/HRS_Checkout_%28Experts%29</a>
<a href="https://hallaweb.jlab.org/wiki/index.php/HRS_Detector_Calibrations">https://hallaweb.jlab.org/wiki/index.php/HRS_Detector_Calibrations</a>
</li></ul></li><li>ARC energy measurement [Doug]
</li><li>Set LHRS DAQ to readout FADC in LHRS (low priority)
</li><li>...
</li></ul></li></ul><p><span style="text-decoration: underline;">Monday DAY</span>
</p>
<ul><li>Hall A will go to Restricted Access for target cooldown
</li><li>We will come back up at 1-pass after the target is cold
<ul><li>NO Compton chicane needed here either
</li></ul></li></ul><p><span style="text-decoration: underline;">Monday SWING --> for a few good integrated shifts</span>
</p>
<ul><li>Run 1-pass CW beam
</li><li>Sieve plates need to be on the RHRS for optics calibration
</li><li>complete any critical beamline commissioning tasks that were not completed
over the weekend
</li><li>Run GMp optics calibrations studies (priority task)
<ul><li><a href="https://hallaweb.jlab.org/wiki/index.php/Spectrometer_Optics_First_pass_48p8d">https://hallaweb.jlab.org/wiki/index.php/Spectrometer_Optics_First_pass_48p8d</a>
</li></ul></li><li>...
</li></ul><p><span style="text-decoration: underline;">Tuesday DAY: Beam Studies</span>
</p>
<ul><li>MCC has 8 hours of Beam Studies during DAY shift
</li><li>Move LHRS to 25 degrees and have it surveyed during beam studies
<ul><li>ask to survey center hole on Sieve plate, if possible
</li></ul></li><li><em>IF 1-pass optics work is completed, then we will come back up at 2-pass,
otherwise stay at 1-pass and complete optics work</em>
</li></ul><p><span style="text-decoration: underline;">Wednesday DAY --> Weekend</span>
</p>
<ul><li>Pass change to 2-pass (if not already done)
<ul><li>move the RHRS to largest angle (~55 degrees), so DVCS calorimeter can
reach 20 degrees
</li><li>go THROUGH the Compton Chicane this time
</li><li>Yves and Compton experts (Gaskell) need to be on-shift during steer up to
make sure the Compton is threaded well
</li></ul></li><li>Run 2-pass production quality beam
</li><li>Complete remaining DVCS calibration tasks and/or pending beamline
commissioning tasks
</li><li>Possible Moller commissioning and/or dedicated Compton Commissioning
</li><li>Get the 2-pass DVCS production data in the can
</li></ul></div>
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