[Halla_running] [New Logentry] RC Status update (Sunday)
brads at jlab.org
brads at jlab.org
Sun Feb 7 12:05:02 EST 2016
Logentry Text:
--
<p><strong>Hall A Senior Staff / System owners: Please read the punchlist below. If
your system is on the list then please follow up with your students/post-docs
<em>TODAY</em> and generate a plan to understand/fix the problem.</strong>
</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 <u>always</u> 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>Hall has been in Beam Permit since Friday OWL
<ul>
<li>Beam has been intermittent as MCC chases accelerator problems, and as they
work on steering up 3-hall operation
</li><li>There was a cold-box (cryo) trip mid-OWL shift. Recovery is ongoing.
<ul>
<li>Earliest beam is likely to be restored is mid- to late-DAY shift
</li></ul>
</li></ul>
</li><li>Significant issues pending (Systems Owners Attn Required!)
<ul>
<li>We have been unable to steer through the 1cm ID "Raster Target" hole
without seeing rate spikes in the HRSs.
</li><li>We have not been able to image the Carbon Hole target.
<ul>
<li>Part of this problem was due to broken, miscalibrated software on our
end (spot++, etc). There are questions about whether the raster is
working correctly too...
</li></ul>
</li><li>Raster and BPM confusion (questions about hardware and software status)
</li></ul>
</li><li>BCM calibration should happen today (Sunday) during DAY/SWING
<ul>
<li>We plan to call senior experts immediately if this plan runs into snags
(Mack, Alex)
</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 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 need to be looked at Monday.
</li></ul>
</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 still working on it (reminded them again this morning)
</li></ul>
</li><li>We have been unable to steer through the 1cm ID "Raster Target" hole
without seeing rate spikes in the HRSs.
<ul>
<li>Many halog entries associated with this issue
</li><li>It is unclear if this is beam optics (halo, strange launch angle to
target, etc). We have a plan in place to investigate further when beam
returns today.
<ul>
<li>Can someone look at <a href="https://logbooks.jlab.org/entry/3376314">https://logbooks.jlab.org/entry/3376314</a> and estimate
beam angle and postion on target from the 1H04A/B Harp wire readouts?
</li></ul>
</li></ul>
</li><li>We have not been able to image the Carbon Hole target.
<ul>
<li>Part of this problem was due to broken, miscalibrated software on our
end (spot++, etc). There are questions about whether the raster is
working correctly too...
</li><li>The DVCS LHRS trigger blows out the file size so we are limited to 36k
events before the file splits and spot++ can not deal with the split
file. We have been switched back to the DVCS trigger from the HRS only
config, but I really do not understand why we have to deal with this
complication right now...
</li></ul>
</li><li>Raster and BPM confusion (questions about hardware and software status)
<ul>
<li>See <a href="https://logbooks.jlab.org/entry/3376318">https://logbooks.jlab.org/entry/3376318</a> (this may be fixed now?)
</li><li>Still strange:
<ul>
<li><a href="https://logbooks.jlab.org/entry/3376489">https://logbooks.jlab.org/entry/3376489</a>
</li><li><a href="https://logbooks.jlab.org/entry/3376275">https://logbooks.jlab.org/entry/3376275</a>
</li></ul>
</li></ul>
</li><li>"Suspicious activity of VDC and straw chamber in LHRS"
<ul>
<li><a href="https://logbooks.jlab.org/entry/3376348">https://logbooks.jlab.org/entry/3376348</a>
</li></ul>
</li><li>"Hall A General Tools" current readback 'hac_bcm_average' seemed to be off
by a factor of 5 from the haHallA_beam_current and 0L02 readbacks during
OWL. Calibration changed/broken?
</li><li>We plan to move the LRHS to 25 degrees first thing Monday and then
get it surveyed during Beam Studies on Tuesday [Brad]
</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>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>CODA EPICS logging still has a few missing/dead variables(?) [Alex, et al]
</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/>
- A few Shift Checklist and documentation issues have been corrected [Julie]
- Right VDC gas flows not showing up on General Tools screen [Jack, Fixed]
- 103 kHz clock needs to be plugged into the DVCS DAQ at next access [Alex, Done]
- 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><u>Sunday DAY -- Monday OWL</u>
</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>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_%28Experts%29">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><u>Monday DAY</u>
</p>
<ul>
<li>Hall A will go to Restricted Access for target cooldown
</li><li>Move LHRS to 25 degrees
</li><li>Sieve plates will be ready to install, but talk to RC <em>before</em> putting them on
</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><u>Monday SWING --> for a few good integrated shifts</u>
</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><u>Tuesday DAY: Beam Studies</u>
</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 25 degrees)
<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><u>Wednesday DAY --> Weekend</u>
</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>
---
This is a plain text email for clients that cannot display HTML. The full logentry can be found online at https://logbooks.jlab.org/entry/3376493
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