View source for RC Update and Run plan for Sep 14,2020

= RC Meeting Information =
<b>RC Daily Meetings are M-F at 4:15 PM</b>
 To join the Meeting:  https://bluejeans.com/861439920
 To join via phone :  +1.408.740.7256 (US (San Jose)), +1.888.240.2560 (US Toll Free))

<b> Monday 14 Sept 2020. </b>

=General updates=
(See [[D2n_Run_Plan_2020|d2n Run Plan 2020]] for broader status/overview.)
* Smooth running once beam came back at 4pm yesterday
** Took production in Kin-A, Kin-X in transverse/90 w/ triggers T1, T3 (and some T2)
** Will likely switch to T2 triggers (EL_real) for rest of Kin-A, Kin-X running (confirm)
*** T2 and T3 cut out a fair bit of garbage at forward angles, particularly in the SHMS
*** Charge normalized yields look comparable for both T2 and T3 (vs T1), but T2 is safer than T3 so we will go with that trigger for remaining Kin-X and Kin-A running
* Beam Studies underway from 10am to ~9pm (including recovery) with opportunity for 5-pass running mid-day
** '''10am''':  Hall C entered ''Controlled Access'' as planned
** Target work (2 tasks currently planned; RadCon support needed)
***  Replace a spectrum analyzer mounting plate.  Updates:  [https://logbooks.jlab.org/entry/3848155].  Re-entered Hall at 3pm (no light in analyzer now) [https://logbooks.jlab.org/entry/3848175].  Issue corrected [https://logbooks.jlab.org/entry/3848241]
***  Take a compass measurement of the field at the carbon foil ladder position if possible.  Updates: [https://logbooks.jlab.org/entry/3848226] Initial impression is that these measurements are consistent with Bill/Murchhana's earlier measurements.  So target field angle is not the driver for lower than expected polarization.
*** Rotate target to '''Transverse/270''' -- Done https://logbooks.jlab.org/entry/3848250], [https://logbooks.jlab.org/entry/3848280]
** SOLID cherenkov config change (in parallel) [Done]
** '''4:15pm - 9:15pm''':  Beam studies, part 2
** Requires beam to Hall C dump. Position locks at our target should remain '''ON'''; MCC will use a '''0.5mm raster''';
*** Talked to Dan Moser: MCC will start with 10uA tune beam and manipulate injector parameters while logging various beam data.  Later will switch to 10--30 uA CW and repeat.
** '''9:15pm'': Continue production running in Kin-A, Kin-X at transverse/270''' after standard beam profile checks.

== Notes for the Future ==
* Melanie, Murchhana, Chao, Sylvester: please check good electron yields per Coulomb for Kin-A/X runs with T1 vs. T3 (T2)
** Mostly complete.  Early results don't show any surprises..
** We will continue with 1 hour ('''T1''') + 3 hours ('''T2''') [and repeat] for remaining Kin-A, Kin-X running

* Moller measurement planned for Wednesday DAY (tentative)

* [[D2n_Run_Plan_2020#1-pass_Running|1-pass running]] transition scheduled for 6am Friday, Sept 18

== Pending Issues ==
* Check EPR calibrations (particularly for 270deg setting, but others too) [Melanie]
** Summary log entries: EPR(270, Kin-Z) [https://logbooks.jlab.org/entry/3847972], EPR(90, Kin-X) [https://logbooks.jlab.org/entry/3848215]

* Bill, Murchhana check compass/field measurements
** Also checking with Jixie re: modeled fields
** Need to make a write-up that clearly defines all the different coordinate systems used, swapped power supply/polarity issues, etc.

* Magnet EPICS PV timeout issue; perhaps reboot skylla10 on Monday?
** Some Magnets Channels Lost Connection Briefly [https://logbooks.jlab.org/entry/3846677] (Saturday, 2pm)
** Also had to add more error checking to the angle reporting in the CODA run-start GUI last week too (same softIOC as above)
** 'Heartbeat' issue reported by Steve Lassiter last week
* Target polarization for Tommy @ 270 is low (mid to high 30s); Tommy @ 90 seems to have plateaued at 38%
** Spectrum analyzer collimator was broken at some point and present optics setup may be allowing transient light to interfere with spectrum measurement and QWP scans
** JP wonders if the field direction is off for the transverse settings (Bill, Murchhana: see note in Target group chat from late Thursday)

* Beam energy drifts
** Just something to keep an eye on.  Has not been a problem lately.
** Hall C 5-pass polarization goes down as energy (HALLC:p) goes up [https://logbooks.jlab.org/entry/3844493]

== Opportunistic Jobs/Access ==
*; Target calibrations / tests (Particularly anything that will be needed at 1-pass!)
** Just before Moller measurement, and/or other known downtimes
** See [[D2n_Run_Plan_2020#Target_Calibrations_and_Tests]]
*** NOTE: Moller planned for Monday

= Current Run Plan =

== Monday SWING &rarr; Tuesday OWL ==
* Beam studies will run from 4:15pm to 9:15pm (or so)
** Requires beam to Hall C dump. '''We must monitor beam positions on the stripchart!'''
** Position locks at our target should remain '''ON'''
** MCC will use a '''0.5mm raster''' for the entire beam studies program
** We will start with '''No Target''' position
*** Talked to Dan Moser: MCC will start with 10uA tune beam and manipulate injector parameters while logging various beam data.  Later will switch to 10--30 uA CW and repeat
** '''When MCC switches to CW mode'''
*** Request target be masked to move target to '''C-Optics'''
*** Take 1 hour C-Optics runs with T2 trigger on both SHMS and HMS.  Just keep the runs going; don't worry about beam trips or pauses.  Adjust prescales to keep the rates around 3.5 kHz in both arms, but no need to 'fine tune', a little extra deadtime is fine for optics running.
*** Add a run-comment that these runs were taken during the Beam Studies program in the Shift Summary and Run database using the <code>add_run_comment</code> command.

* Continue production data in Kin-A, Kin-X with pol 3He target, '''Transverse/270''' polarization with pNMR/NMR every 5 hrs.
** '''NOTE''':  Take 1 run with '''T1'''(3/4) trigger; then 3 runs using '''T2'''(EL_real) trigger;  '''Then repeat that cycle.'''
*** Be sure to monitor and set the prescales correctly.
*** Put '''T1''' or '''T2''' in the CODA comments field for the runs.
*** Note the '''T1''' or '''T2''' trigger type for each run in the Shift Summary and Run database using the <code>add_run_comment</code> command.

== Tuesday DAY &rarr; Tuesday SWING ==
* Continue production data in Kin-A, Kin-X with pol 3He target, '''Transverse/270''' polarization with pNMR/NMR every 5 hrs.
** '''NOTE''':  Take 1 run with '''T1'''(3/4) trigger; then 3 runs using '''T2'''(EL_real) trigger;  '''Then repeat that cycle.'''
*** Be sure to monitor and set the prescales correctly.
*** Put '''T1''' or '''T2''' in the CODA comments field for the runs.
*** Note the '''T1''' or '''T2''' trigger type for each run in the Shift Summary and Run database using the <code>add_run_comment</code> command.

 -- General plan below this point is fixed, but details may be adjusted as beam/target requires --

== Wednesday OWL &rarr; Wednesday SWING ==
* Moller measurement on Wednesday DAY
** This will also be used to infer polarization at 1-pass (if it fails, we'll try again on Thursday DAY)
* '''Wednesday OWL or DAY during Moller''' Move spectrometers to Kin-C, Kin-Z and continue Transverse/270 running there
* Continue production data in Kin-C, Kin-Z with pol 3He target, '''Transverse/270''' polarization with pNMR/NMR every 5 hrs when Moller complete.
** All runs for these settings use the '''T1''' trigger ''only''

== Wednesday OWL &rarr; Wednesday SWING ==
* Continue production data in Kin-C, Kin-Z with pol 3He target, '''Transverse/270''' polarization with pNMR/NMR every 5 hrs.
** All runs for these settings use the '''T1''' trigger ''only''

== Thursday OWL &rarr; Friday OWL ==
* Continue production data in Kin-C, Kin-Z with pol 3He target, '''Transverse/270''' polarization with pNMR/NMR every 5 hrs.
** All runs for these settings use the '''T1''' trigger ''only''
* '''6 am''' Move to Controlled Access (w/ RadCon support) to begin transition to 1-pass

== Friday DAY ==
* (Started at 6am) Open target enclosure
** Install collimators (JP, RadCon)
** Check on EPR photo-diode status, likely replace it? (JP, RadCon)
* Ensure fast raster is reconfigured correctly (Expert: Jones, Gunning)
* Rotate to minimum angles for HMS (11.7) and SHMS (8.5) (S.  Lassiter, A. Comer)
* Configure target for Longitudinal/0 or Longitudinal/180 (TBD)

* Close up and wait for MCC to establish (1-pass) beam to the Hall

== Friday SWING &rarr; Monday ==
* See task list at [[D2n_Run_Plan_2020#Run_Plan_for_1-pass|Run Plan for 1-pass]] for more details
** Initial priority will be PbPt polarization cross check with longitudinal pol. elastics.
** These have lower priority but will likely be pursued while target spins up
*** 3He, N2 density measurements
*** H2 xsec measurement
*** Pressure curves


== Standing Orders ==
*''' ''Change the IHWP at least every 8 hours'' when running on glass cells. Call Halls A and B in advance. If there are any issues, call the RC'''
*''' Ensure that all information in the CODA run-start GUIs is ''correct for every run''!'''
* If beam goes away for more than 3h, or MCC does operations on the beam that may change the beam tune, then move target to '''No Target''' position,
** verify Harps scans at 3H07A and 3H07B are within spec, '''and'''
** ensure beam is stable (with all locks '''ON''') at 0, 0mm before continuing.
** [[Beam_and_Raster_Checkout_for_A1n/d2n_(Short_Procedure)|Beam recovery procedure]] has more detailed procedure if needed.
* New beam positions have been verified and established to be (0,0) mm for all targets.
** Monitor that beam is at (0,0) using the stripchart on the Wall screen and verify no scraping on the glass cells using the Analysis monitor.

* Check the position locks are on.
* Check that CODA is running normally (had one strange hangup lately)
* Check online replays shortly after starting runs, & full replay results too.
* Fill BTA with realistic numbers. You may follow the guidance coming from "load from EPICS", if it does not overestimate the ABU (as it generally does). https://logbooks.jlab.org/entry/3783171. If we have to lower the beam current we actually want because the beam is too unstable, prorate the ABUs. 

 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !!                                                     !!
 !!  ATTN: SHIFT LEADERS                                !!
 !!     Please follow the shift summary template on     !!
 !!     the laminated SL instructions.                  !!
 !!                                                     !!
 !!  ATTN: TARGET OPERATORS                             !!
 !!  All NMR measurement HCLOG entries should include:  !!
 !!     1) A title that clearly lists polarization      !!
 !!     2) Screenshots of both NMR_FieldSweep and       !!
 !!        the polarization fit                         !!
 !!                                                     !!
 !!     For an example see the following entry:         !!
 !!     https://logbooks.jlab.org/entry/3768696       !!
 !!                                                     !!
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

== Notices in Effect for Shift Crew ==
* Policy for CANS-related hall status change: Make a logbook entry when the hall goes in, or comes out of laser-controlled access.
** Good examples for [https://logbooks.jlab.org/entry/3747393 entering] and [https://logbooks.jlab.org/entry/3747544 leaving] laser access.
* Magnet policies
** Follow the updated guidelines in the [[How-to#Spectrometer_Magnets Spectrometer Magnets]] How to
** Spectrometer GUI (<code>go_magnets</code>) should always be visible on Shift Leader computer, hcdesk3
** If any magnet trips, snapshot the associated power supply window and post it to hclog '''before''' resetting the interlock.
* Monitor the beam position on target and call MCC immediately if you see large excursions (1 mm level).
* When rotating the spectrometer, use HCCAM01 to keep an eye on the SOLID Cherenkov test stand when rotating SHMS (in addition to watching the live angle-cam image, etc). The updated rotation instructions are here: https://hallcweb.jlab.org/wiki/index.php/Spectrometer_Rotation#NOTICES_IN_EFFECT

= Useful Links =
[[PolHe3 Polarization Measurements]]

== Misc Links ==
* [[Polarized Helium-3 Experiments | Main Pol He-3 wiki]]
* [https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=HALLC-POL3HE Shift Schedule]
* [https://hallcweb.jlab.org/live_status/snapshots_controls/ Hall-C Controls]
* [https://logbooks.jlab.org/book/hallc Hall-C Logbook]
* [https://cebaf.jlab.org/files/ops/accboard/ MCC White Board]