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</style><article id="node-450287" 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/3377470" rel="bookmark">RC Status update (Tuesday)</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3377470" class="lognumber" data-lognumber="3377470">3377470</a>. Submitted by <a href="https://logbooks.jlab.org/user/brads">brads</a> on <time datetime="2016-02-09T15:50:55-0500" pubdate="pubdate">Tue, 02/09/2016 - 15:50</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">
<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>Target cool down took longer than hoped, but it is cold. Unfortunately both
Loop 2 and Loop 3 leak. At the moment the pumps can keep up, so we're OK for
now. Loop 2 has the worst leak and has been disabled. Loop 3 is the active
LH2 target.
<ul><li>The scattering chamber pressure is now good, and appears stable.
</li><li>We have the go-ahead to run as high ~50 uA on Loop 3 at will.
</li></ul></li><li>We didn't get much beam last night (Tues OWL), and what we had was consumed
by Accelerator steer-up and Ion chamber calibration work. At 5:38 there was
a fire alarm in the east arc and took the Accelerator offline.
<ul><li>The alarm was not false. A power lead on one of the 3rd pass, east arc
dipoles overheated badly (Arc 5A). MCC completed damage assessment and
inspections of other magnets this afternoon.
</li><li>We will be returning to 1-pass ASAP
</li></ul></li><li>Hall A just came out of Controlled Access (MCC is now ready to restart
delivery at 3pm)
<ul><li>Target group addressed their punchlist. We're in good shape with Loop 3.
</li><li>Survey completed measurement of the LHRS at 16.5 degrees
<ul><li>Wire target fiducials deferred to another day (no access while target
group working in that area)
</li></ul></li><li>Moller group completed their work on the exterior of the Moller target
motion system. See <a href="https://logbooks.jlab.org/entry/3377438">https://logbooks.jlab.org/entry/3377438</a>
<ul><li>Beamline vacuum was <em>not</em> touched. That work will be deferred to the
next opportunistic down
</li></ul></li></ul></li><li>We will return to 1-Pass Tuesday SWING 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>Best estimate of plans (talked to PD at 3:15pm)
<ul><li>Accelerator will start repair work during DAY shifts starting tomorrow.
If things go well, they are hoping to be fully repaired by end of day
shift Friday(!)
</li><li>So, no beam during DAY shifts Wed, Thursday. Beam will restore to Hall A
in SWING and run SWING and OWL.
</li><li>Hall A will complete the 1-pass program described above and move to
2-pass at first opportunity (Friday at the latest)
</li><li>Note that with 3+ pass disabled, Hall A is the <em>only</em> Hall in operation
for the rest of this week.
</li><li>Weekend running will proceed as previously planned:
<ul><li>Hall A should be at 2-pass by that point and will remain there
</li><li>Hall B take 1-pass and have priority
</li></ul></li></ul></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>Need to decide what to do about DAY shift staffing this week
<ul><li>TO is still mandatory!
</li></ul></li><li>CODA EPICS logging still has a few missing/dead variables(?) [Alex, et al]
<ul><li>[new] also epicsLogger problems (Right and left DAQs calling same logging
script and stepping on each other)? [Alex, Longwu]
</li></ul></li><li>Analyze BCM calibration data and get it posted
<ul><li>See also <a href="https://logbooks.jlab.org/entry/3377095">https://logbooks.jlab.org/entry/3377095</a>
</li><li>Update software coefficients as needed
</li><li>Analysis of new BCM receiver data? [Barak?]
<ul><li>Any update on D1 drift in Unser?
</li></ul></li></ul></li><li>Clarify LHRS momentum limits
<ul><li>In Amperes: LQ1 is 'comfortable' at 1600A, 'probably fine' at 1800A,
and Jack is getting very uncomfortable above that.
<ul><li>Establish what the above currents map to in terms of GeV/c with standard
optics.
</li></ul></li><li>The rest of the magnets are good up to 4 GeV/c
</li></ul></li><li>Clarify RHRS momentum limits
</li><li>Arc energy scan at 2 pass (4.48 GeV/c)
<ul><li>Doug will attach orbit information as a comment to
<a href="https://logbooks.jlab.org/entry/3376077">https://logbooks.jlab.org/entry/3376077</a> [needs to be done]
</li></ul></li><li>Harp scanners look generally OK, one question mark remaining
<ul><li>1C17 maybe fixed (status unclear, experts busy with Accel fire issues
today), should run it tonight to check
</li><li>1H00 is fixed
</li></ul></li><li>Position, Energy, Current locks (and FFB) still being worked by MCC [MCC, Brad]
</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>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>Target computer sound needs fixing (Target ALH needs to be audible)
</li><li>Arc energy scan at 1-pass?
<ul><li>Doug off-site for the week. Buddhini?
</li><li>Doug will put in request to get the Ultrastab current meter into EPICS
archiver (will give us a precision history of the current in the arc
dipoles).
</li><li>Doug suggest measuring/logging the current in the dipole string with
Ultrastab. The field is extremely linear at these energies, so BdL
measured at 2-pass can be scaled with good accuracy. [Needs to be looked
at. Buddhini, Doug?]
</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 Scanner Harp controls [new screen] does not work
</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 /><ul><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, Bob: 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>"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><li>Determined status to be OK, Kalyan keeping an eye on it
</li></ul></li><li>Minimum LHRS angle is 16.5 degrees (where we are now)
<ul><li>first interference is between collimator box, LQ1 snout and beamline shielding
</li><li>See <a href="https://logbooks.jlab.org/entry/3377230">https://logbooks.jlab.org/entry/3377230</a>
</li></ul></li><li>These alarm handlers all make noise (ie. audible alarm)
<ul><li>LeCroy HV controls [working]
</li><li>Hall A general ALH [working]
</li></ul></li><li>DVCS HV issue was due to a cut network cable (looked like someone may have
tripped on it and the cable snagged and tore) [Fixed]
</li><li>LHRS L1-Accept scaler double counting solved: <a href="https://logbooks.jlab.org/entry/3377026">https://logbooks.jlab.org/entry/3377026</a>
</li><li>VDC gas flow fluctuations on feedbacks are within expectations
</li><li>Raster problems fixed
</li><li>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.
</li><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 for high momenta, 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;">Tuesday DAY</span>
<ul><li>Hall A at 1-pass, target cold (Loop 3)
</li></ul><p><span style="text-decoration: underline;">Tuesday 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 = 1.0 GeV/c, Angle = 16.5 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;">Wednesday--Thursday DAY Shifts</span>
</p>
<ul><li>Down for MCC work on Arc dipole
</li><li>Beam returns to our Hall during SWING
</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;">Still to do</span>
</p>
<ul><li>Pass change to 2-pass once 1-pass work is completed
<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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