View source for RC Update and Run Plan for March 20, 2020

Current RC: <b>Jay Benesch</b>  benesch@jlab.org  

<b> RC Daily Meetings are M-F at 4:15 PM, 2nd floor Counting House Meeting Room </b>
[https://bluejeans.com/861439920 Bluejeans Connection]

=General updates: =

* Hall is in restricted access.
* Let the RC, Jay Benesch, and Walter Kellner know about any '''non-pivot''' work you'd like to take place during the March 13-20 down in Hall C. (Please CC Brad as well.)  
* Field measurements complete.  First part of survey complete.  
* B and C laser seeds were switched Thursday morning.  https://logbooks.jlab.org/entry/3806164
* The work items are currently:
*# A 3He compressor checkout for the x > 1 experiment next year (Meekins/RadCon); 
       RC mentioned this at 0800 meeting 3/18.  Dave Hamlette said he'd coordinate with Meekins. 
*# SOLID detector test the scope of which is defined in the HClist http://devweb.acc.jlab.org/CSUEApps/hclist/task/1809 (Malace et al).
*# Vote for your favorite T-shirt design https://misportal.jlab.org/ul/apps/jag/tshirt/index.cfm  I prefer Staphany's JLAB word cloud, entry 11, for reasons which will become obvious if you look closely.

= Current Run Plan: =


* continue Solid prototype installation

== Friday-Saturday ==

*    Both beamline windows were mounted Friday, pump down Friday with good leak check.  Waiting on ion pumps tomorrow. 
*    ESH evaluation of target ladder and laser platform work 0830 Friday.  Work rules and PPE defined.  Work underway. 
*    Install reference cell (done Thursday evening), overnight leak check fine Friday morning
*    Steve Lassiter checked rotation capability Friday.
*    One of the 3H07B harp wires is visually damaged per I&C.  This wire has been providing readings that I didn't believe.  It is redundant with the third wire.  I&C found it broken in an innocuous place so no action was taken.
*    Install target cell and pump laser alignment through 2200 tonight. 
*    Recommission target and start spinning He3 up overnight Saturday (through SWING and OWL as needed)

== Notes for the Future ==
* <font color="red"> At d2n startup, it would be a good idea to quantitatively check the dispersion at the target.</font> I (D.Mack) don't think we need a tight spec, but if it's as sloppy as 1 cm/% (hence a decent spectrometer), then we're more at risk for things like how much the beam moves when the locks are off, or scraping from an off-energy tail on the beam.  Jay:MQA3C13 can be adjusted to change horizontal dispersion. 


* 'Filler' runs for next spin up / target-down period (Don't want to forget about this!):
**  <font color="red">DONE</font> 1 hour run with target out for measure of the background just from the beryllium windows. (Needs SHMS, btw.)

== Pending Issues ==

*; Be sure to restart main alarm handlers and turn up speaker volume before operating magnets! [https://logbooks.jlab.org/entry/3803813]
*; Be sure to restart target alarm handler and turn up speaker volume before operating target! [https://logbooks.jlab.org/entry/3803813]
*; pNMR issues
*; software : Software/driver issue needs to be resolved. Checkout during next non-production down time (Moller or SHMS fix)
*; EPR problems : [https://logbooks.jlab.org/entry/3793821] saw some progress on Tuesday [https://logbooks.jlab.org/entry/3796852], but issues remain.
*: Tentative plan now is to continue the d2n (and A1n) program by replacing the photo-diode that is placed directly on the pumping chamber (we have many spares). 
*: It would be good to write up a procedure to streamline this replacement procedure for us and RadCon
*; Kepco power supply : PS commissioning/installation (Todd, Bill) (Bill got a filter design from the vendor and has ordered parts.)
*: New filter (for 180 Hz) to install for current mode operation fix. Can always go to voltage mode if it doesn't work. 
*; NMR Calibration Constants : Verify that calibration constants and input values associated with NMR and other polarimetry are consistent and will be correct when the software is restarted 
*:[https://logbooks.jlab.org/entry/3796178] [https://logbooks.jlab.org/entry/3795421] [https://logbooks.jlab.org/entry/3795982] [https://logbooks.jlab.org/entry/3796117] [https://logbooks.jlab.org/entry/3796111] (Bill, Junhao, Arun)
*** Add list of calibration runs and what constants apply to what production runs here: [[PolHe3_Polarization_Measurements]]
*; Beam trips : Persistent BLM and ion chamber trips 
*:* General activation, weird BLM issues (https://logbooks.jlab.org/entry/3792326), Ad-hoc ion chamber threshold adjustments (https://logbooks.jlab.org/entry/3792095)
*:* '''NOTE''': Shift crew should ''NOT'' give authorization to MCC change ion chamber thresholds.  If they ask, tell Operator to contact an appropriate expert.  Make a log entry if trips persist, or call the RC if it becomes severe (for example, >20 trips/hour is getting intolerable)
*:* Beam Studies program will investigate some of these issues (most pressing is significant activation + beam loss in the arcs)
*; USB bridge : Contact with Target readbacks through AnywhereUSB USB bridge still drop out on occasion
*:* Initial replacement of the USB bridge failed (did not seem to help underlying issue, then bridge stopped working), replaced with original device
*:* Ensure issues on Sat, March 14 have been corrected [https://logbooks.jlab.org/entry/3803795]
*; IOC issues : Green now: Rebooted 3/2/20 with Dave Gaskell assistance.  OPs wished to reboot hung iochc10 [https://logbooks.jlab.org/entry/3795636], noted in December as well [https://logbooks.jlab.org/entry/3745818]
*: This runs the Moller cryo controls and should not be rebooted without expert oversight (does not impact operations).  D. Gaskell is looking into getting this addressed properly with OPs.

== Opportunistic Access Jobs ==
 
None at the moment. 


<!--
== Standing Orders ==
  If beam goes away for more than 2h, or if during the downtime, MCC does operations
  that may change the beam tuning, then do [https://hallcweb.jlab.or/wiki/index.php/Beam_and_Raster_Checkout_for_A1n/d2n_(Short_Procedure)
  beam recovery procedure] (do YAG viewer part '''only''' if you are suspicious of
  the harp scan results)
*'''NOTE''': Shift crew should ''NOT'' give authorization to MCC change ion chamber thresholds. If they ask, tell the Operator to contact an appropriate expert. Make a log entry if trips persist, or call the RC if it becomes severe (for example, >20 trips/hour is getting intolerable)
* Check the position locks are on.
* Do your best to accommodate Hall A's request for a PITA scan promptly.  It is OK to stop the present runs and start new ones in 5--10 minutes after they are done.
* Check that CODA is running normally (had one strange hangup lately)
* Check online replays shortly after starting runs, & full replay results too.
* Make sure all the [http://opsweb.acc.jlab.org/internal/ops/ops_webpage/restrictions/ops_restrictions.html beam specs] are followed (e.g. no raster size below 4mm on 3He cell).
* Always take 120Hz of EDTM
* 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
** Spectrometer GUI (<code>go_magnets</code>) should always be visible on Shift Leader computer, hcdesk3
** HMS Q1 must be ramped down in 50A steps in all cases
** Do not ramp HMS Q2 to zero, only go to 10A and then switch off power.
** 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).
*Ramp rate lock instructions are here and added to checklist[https://logbooks.jlab.org/entry/3753633]
-->

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= Useful Links =
* [[PolHe3 Polarization Measurements]]
* [[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]