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</style><article id="node-448334" 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/3375517" rel="bookmark">RC Status update (Thursday)</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3375517" class="lognumber" data-lognumber="3375517">3375517</a>. Submitted by <a href="https://logbooks.jlab.org/user/brads">brads</a> on <time datetime="2016-02-04T21:57:20-0500" pubdate="pubdate">Thu, 02/04/2016 - 21:57</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>A rough punchlist first, followed by the tentative plan for the next few days.
</p>
<hr /><strong>Exec summary</strong>
<hr /><ul><li>We locked up the Hall Thursday SWING to allow MCC to begin steering 2-pass
beam up the Hall A line (no Compton chicane, no target, no shift crew needed
tonight)
<ul><li>Tune beam restriction in place (CW prohibited)
</li><li>Target set to 'no target' position, and motion controller locked out
</li><li>DVCS calorimeter moved as far back as possible
</li><li>All HVs turned off
</li></ul></li><li>CH will be staffed starting Friday DAY shift.
<ul><li>We will be going to Controlled Access Friday morning to allow work to
continue on the HRS dipole controls.
</li></ul></li><li>We plan to run 2-pass beam starting in SWING and 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>can still run higher currents in 'no target' position
</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]
<ul><li>Still in progress: see <a href="https://logbooks.jlab.org/entry/3374823">https://logbooks.jlab.org/entry/3374823</a> and follow-ups
</li><li>Target harps not working, unclear if it is software or hardware...
</li></ul></li><li>CODA EPICS logging still has a few missing/dead variables [Alex, et al]
</li><li>Mongi will run through the Shift Checklist and verify that:
<ul><li>it is up to date, and
</li><li>all the necessary readbacks can still be found (and work)
</li></ul></li><li>Multiple HRS Magnet issues [Segal]
<ul><li>See <a href="https://logbooks.jlab.org/entry/3375471">https://logbooks.jlab.org/entry/3375471</a>
</li><li>Right and Left Dipoles not working right now (NMR and controls issues)
</li><li>Left Q1 has limit of 1800A, but stay below 1600A 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></ul></li><li>RHRS DAQ deadtime problem [Alex, Bob, et al]
<ul><li>could be bad power supply in TS crate, Gunning asked to check it out
</li></ul></li><li>Raster readback issue corrected
<ul><li>still waiting for upgraded raster offset attenuators to be delivered [Cuevas]
</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>HRS VDC readbacks on General Tools screen dead
<ul><li>update howtos and/or fix problems: <a href="https://logbooks.jlab.org/entry/3375499">https://logbooks.jlab.org/entry/3375499</a>
</li></ul></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 Harp controls [new screen] does not work
</li><li>xscaler display could use some updated labels and/or BCM information [Bob,
Julie]
</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><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></ul><hr /><strong>Completed Punchlist Items (new)</strong>
<hr /><ul><li>Confirm coin. timing in DVCS DAQ with EDTM [Done]
</li><li>Raster readback currents zero when on issue fixed [Barak, Kalyan]
</li><li>The LHRS motion works (but was a bit flaky), LRHS moved to 38.64 deg
</li><li>Hall A Halo Monitor reported to be not working/disabled
<ul><li>not critical path item, so will not follow-up at this time
</li></ul></li><li>Wien is set for nominal max polarization to Hall A for 2-pass beam (FWIW)
</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 -- 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;">Thursday SWING -- Friday OWL</span>
</p>
<ul><li>Target moved to the 'no target' position and motion locked out
</li><li>The DVCS calorimeter will be moved to its safest position (farthest from the beam line).
</li><li>Tune-beam ONLY (CW is prohibited)
</li><li>MCC should be instructed to call the RC cell phone if necessary.
</li></ul><p><span style="text-decoration: underline;">Friday DAY -- Weekend</span>
</p>
<ul><li>2-pass beam, NO Compton chicane
</li><li>Initial RHRS settings: P0 = 0.75 GeV/c, Angle = 48.75
</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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