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</style><article id="node-449917" 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/3377100" rel="bookmark">RC Status update (Monday)</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3377100" class="lognumber" data-lognumber="3377100">3377100</a>. Submitted by <a href="https://logbooks.jlab.org/user/brads">brads</a> on <time datetime="2016-02-08T15:20:22-0500" pubdate="pubdate">Mon, 02/08/2016 - 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><tr><th>Tags: </th><td><a href="https://logbooks.jlab.org/tag/shiftsummary">ShiftSummary</a></td></tr></table></div>
<div class="logentry node-content">
<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></ul></li><li>BCM calibration completed
</li><li>DVCS/LHRS coincidence peak was observed where expected
<ul><li>See <a href="https://logbooks.jlab.org/entry/3376942">https://logbooks.jlab.org/entry/3376942</a>
</li></ul></li><li>Raster problem as been solved
</li><li>The Hall has been in Controlled Access since the as of 8am for the following
primary tasks:
<ul><li>Target cool down
</li><li>Investigate raster [Done, fixed]
</li><li>Investigate remaining problematic Harps (1C17, 1H00)
</li><li>Move the LHRS -> 15deg, set the DVCS calorim to quasi-elastic kin.
</li><li>Install sieve plate on RHRS
</li></ul></li><li>We will come back up at 1-Pass and execute the following:
<ul><li>Complete the target/beam alignment study
</li><li>Do a BPM calibration/Bull's Eye scan
</li><li>Begin the 1-pass optics studies for DVCS and GMp
</li></ul></li><li>additional 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 scanners look generally OK, a couple of problems though
<ul><li>See <a href="https://logbooks.jlab.org/entry/3376480">https://logbooks.jlab.org/entry/3376480</a>
</li><li>1H00 is strange, 1C17 is <em>not</em> working. Both being looked at Monday.
</li></ul></li><li>Raster issues/questions
<ul><li>Raster hardware issues should be fixed
<ul><li>See <a href="https://logbooks.jlab.org/entry/3377029">https://logbooks.jlab.org/entry/3377029</a>
</li><li>Possible swapping of raster signal to DAQ mapping [Barak, fixed?]
<ul><li><a href="https://logbooks.jlab.org/entry/3375810">https://logbooks.jlab.org/entry/3375810</a>
</li></ul></li></ul></li></ul></li><li>Position, Energy, Current locks (and FFB) status unclear [MCC, Brad]
<ul><li>MCC still working on it (reminded them yet again this morning)
</li></ul></li><li>Beam position studies
<ul><li>We have been unable to steer through the 1cm ID "Raster Target" hole
</li><li>We have not been able to image the Carbon Hole target.
</li><li>We will revisit this at first beam this afternoon.
</li></ul></li><li>"Suspicious activity of VDC and straw chamber in LHRS", status update?
<ul><li><a href="https://logbooks.jlab.org/entry/3376348">https://logbooks.jlab.org/entry/3376348</a>
</li></ul></li><li>Analyze BCM calibration data and get it posted
<ul><li>Update software coefficients as needed
</li><li>See also <a href="https://logbooks.jlab.org/entry/3377095">https://logbooks.jlab.org/entry/3377095</a>
</li></ul></li><li>Arc Scanner Harp controls [new screen] does not work
</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 [sound working now, HV alarms need to be tested]
</li><li>Hall A general ALH [working]
</li><li>Target ALH [fix in progress?]
</li></ul></li><li>CODA EPICS logging still has a few missing/dead variables(?) [Alex, et al]
</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>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>segment of upstream beamline will be opened on Tuesday during Beam Studies
to implement (temporary) fix
</li></ul></li></ul><hr /><strong>Completed Punchlist Items (new)</strong>
<hr />
- LHRS L1-Accept scaler double counting solved: <a href="https://logbooks.jlab.org/entry/3377026">https://logbooks.jlab.org/entry/3377026</a>
- VDC gas flow fluctuations on feedbacks are within expectations
- Raster problems fixed<br />
- BPM strangeness investigated, best guess is MCC steering procedure not quite
right. This has been clarified by Yves and passed on to Crew Chiefs to be
implemented from now on.
<ul><li>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
</li></ul></li><li>BCM readouts are reported to be working [Alex, Musson, Mack, Ciprian]
<ul><li>need to keep an eye on this though...
</li></ul></li></ul><hr /><strong>Tentative plan for the near term</strong>
<hr /><span style="text-decoration: underline;">Monday DAY</span>
<ul><li>Hall A will go to Controlled Access for target cooldown
</li><li>Move LHRS to 15 degrees
<ul><li>Sieve plates installed on RHRS only at this time
</li></ul></li><li>We will come back up at 1-pass after the target is cold
</li></ul><p><span style="text-decoration: underline;">Monday SWING --> for a few good integrated shifts</span>
</p>
<ul><li>1-pass beam, NO Compton chicane
</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><li>Sieve plate: ON
</li></ul></li><li>Initial LHRS settings: P0 = ~2.1(?) GeV/c, Angle = ~15 deg
<ul><li>Sieve plate: OFF to start, will install during SWING if possible, or first
thing Tuesday DAY shift
</li></ul></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>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")
<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><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></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;">Tuesday DAY: Beam Studies</span>
</p>
<ul><li>MCC has 8 hours of Beam Studies during DAY shift
</li><li>Survey group will come in to measure the LHRS (at 15 degrees) at 9am
<ul><li>requested survey of center hole on LHRS Sieve plate, if possible
</li><li>requested survey of target wire fiducials, 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>Ensure Position, Energy, Current locks (and FFB) is (finally!) enabled
</li><li>Possible Moller commissioning and/or dedicated Compton Commissioning
</li><li>Run 2-pass DVCS production setting
</li><li>...
</li></ul></div>
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