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</style><article id="node-450713" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/node/450713" rel="bookmark">RC Status update (Wednesday)</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3377896" class="lognumber" data-lognumber="3377896">3377896</a>. Submitted by <a href="https://logbooks.jlab.org/user/brads">brads</a> on <time datetime="2016-02-10T15:50:01-0500" pubdate="pubdate">Wed, 02/10/2016 - 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><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>Target is cold and 'mostly' stable
<ul><li>Loop 3 is the active LH2 target -- we should have enough headroom for
40--50uA at will
</li><li>The scattering chamber pressure is now good, and was relatively stable
yesterday.
</li><li>The target group is monitoring some anomalous pressure spikes in the
return line. Seems to be, at least in part, a bad pressure transducer
(now bypassed) <a href="https://logbooks.jlab.org/entry/3377831">https://logbooks.jlab.org/entry/3377831</a>
</li><li>Meekins came by around 1:30--2:00 to investigate a degrading target
vacuum, waiting on a report.
</li></ul></li><li>Beam returned to Hall A mid-SWING on Tuesday
<ul><li>Some of the delay was due to MCC (Yves, and Mike T.) developing a
2nd pass 'witness beam' to allow the Hall A energy lock to function.
This was complicated by what turned to be a failed power supply in the
2nd pass separator. That has been corrected and the witness beam will be
worked on today.
</li><li>The beam spot showed up easily on the Target OTR and BeO target, but
we continued to struggle with controlling the rastered beam size on
target. Tonight, it appeared as if the magnets that raster the beam
vertically were 'stuck' at some small value. See SWING halog for a long
list of checks, and tests.
<ul><li>Bill G. and Bob M. checked the raster system and everything they could
check looked fine <a href="https://logbooks.jlab.org/entry/3377747">https://logbooks.jlab.org/entry/3377747</a>
</li><li>I checked with Yves (Optics) again, he double checked his optics params
with the machine (and had others check his work) and it looks to be on
design. Very puzzling. We will try to tease apart the optics vs.
raster issue first thing today with Yves' support.
</li></ul></li><li>A partial Bull's Eye scan was done, might be good to look at these to
sanity check existing calibrations and get the framework ready to process
the upcoming complete scan
<ul><li><a href="https://logbooks.jlab.org/entry/3377649">https://logbooks.jlab.org/entry/3377649</a>
</li><li><a href="https://logbooks.jlab.org/entry/3377642">https://logbooks.jlab.org/entry/3377642</a>
</li><li><a href="https://logbooks.jlab.org/entry/3377633">https://logbooks.jlab.org/entry/3377633</a>
</li></ul></li><li>MCC worked on debugging orbit locks
</li></ul></li><li>Hall A was in Controlled Access during DAY shift while MCC worked on
removing the failed magnet
<ul><li>Raster supplies were checked, look fine.
</li><li>Target OTR camera was replaced and reposition to provide a better image
and remove a glare artifact.
</li><li>MCC suspicious that MBD1H04H (correct near Moller quads) was wired
backwards. Was checked and found to be wired correctly.
</li><li>1H04 Harp IOC had locked up mid-OWL was rebooted in the labyrinth
</li></ul></li><li>We will return to 1-Pass Wednesday SWING and execute the following:
<ul><li>Complete the target/beam alignment study with a plan to isolate the raster
performance from the focusing effects of the quads for debugging
purposes.
</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 schedule through weekend:
<ul><li>Accelerator will restore beam to Hall A during SWING
</li><li>Beam off around 4--5am in OWL, and will remain down into Thursday SWING
(likely longer than today).
</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>RQ1 'bigbox' power supply is getting disabled by OPS when they go to work on
the Arc string.
<ul><li>Moller quad supply has seen the same issue (not 'ours', but may have to
remind MCC if operators are struggling)
</li><li>MCC notified, see also <a href="https://logbooks.jlab.org/entry/3377868">https://logbooks.jlab.org/entry/3377868</a>
</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>Problem with D_new values maybe due to bad cables (now replaced)? [Mack,
Thir, Musson]
</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>Analysis continues.
</li><li>Update software coefficients as needed.
</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>Jessie [Techs] need to move the power supply blocking large angle RHRS
</li><li>Need 'golden spectra' for online replay eventually
</li><li>Have 'howto' for manually logging Arc Energy information
<ul><li><a href="https://logbooks.jlab.org/entry/3377609">https://logbooks.jlab.org/entry/3377609</a>
</li><li>Need to add to Shift worker 'howto' and shift checklist (ie. do this
1/shift)
</li></ul></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, should run it tonight to check
</li></ul></li><li>Position, Energy, Current locks (and FFB) actively still being worked by MCC
<strong>[MCC, RC]</strong>
</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>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) [Request in, not done yet]
</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>Get offset/attenuator cards to Fast Electronics for repair [Alex, Barak]
</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>Significant issue with Moller target [Sasha, Roman]
<ul><li>target position/angle shifts when magnet ramped up, can not maintain alignment
</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>
</li><li>Beamline vacuum was <em>not</em> touched. That work will be deferred to the
next opportunistic down
</li></ul></li></ul><hr /><strong>Completed Punchlist Items (new)</strong>
<hr /><ul><li>Target computer sound fixed
</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>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 dipole showing some puzzling readbacks
<ul><li>determined to be fine for now, but Jack is keeping an eye on it
</li></ul></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;">Wednesday DAY</span>
<ul><li>Hall A at 1-pass, target cold (Loop 3)
</li></ul><p><span style="text-decoration: underline;">Wednesday 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 Wednesday 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
<ul><li>talk to experts, we will do this a little differently this time
</li></ul></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 25 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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