[Hallc_running] [EXTERNAL] Re: [New Logentry] RC update (Sept 12) -- NO RC meeting today
Brad Sawatzky
brads at jlab.org
Sat Sep 12 23:04:34 EDT 2020
It seems the Hall C access on Monday will start at 10am as planned.
** Watch for confirmation on Sunday, however. **
-- Brad
On Sat, 12 Sep 2020, Brad Sawatzky wrote:
> Dave G. and I will be taking an opportunistic access at 4:15pm today to try
> to address the iochc10 issue.
>
> We will cancel the 4:15pm meeting today. There will be a meeting tomorrow
> (Sunday)
>
> NOTE: I was recently notified by the PD that the Hall C controlled access on
> Monday may shift to 2pm instead of 10am.
>
> ----------------------------------------------------------------------------
>
> Saturday 12 Sept 2020.
>
> General updates
>
> (See [8]d2n Run Plan 2020 for broader status/overview.)
>
> o Presently down from 2pm (until 5--6pm) for an RF klystron replacement
> [[9]https://logbooks.jlab.org/entry/3846701]
> o Production running on Transverse target (@ 90); Kin-C, Kin-Z continues.
>
> o General plan when this is done is to complete Kin-A, Kin-X
> (partially done already); then move on to Kin-B/Y and/or 1-pass
> running as time allows.
>
> o Moller measurement was rescheduled for today (2nd attempt); still
> working on it as of 3:30pm (Accelerator issues) [10][1]
> o Should move to Kin-A, Kin-X in the next day or so and finish 90-deg
> running there
> o Target should be rotated to 270 deg on Monday
> o Max Target Tommy polarization @ 90 since yesterday has been 38.5%
> [11][2], it seems to have plateaued at 378% today [12][3], [13][4]
>
> o For comparison, maximum seen with target at 90 deg last week was
> 44% (9/5/2020 22:56:38)
> o FWIW, that is similar to the maximum seen at 270 was 37.5% [14][5];
> Recent max around 36% (Thursday) [15][6]
>
> o Moller measurement completed Friday 86.1% [16][7], (incl. 0.9%
> bleedthrough correction from Hall A)
> o Significant down during Friday swing due to problem with iochc10 IOC
> which handles Moller controls, magnet cryo, etc
>
> o Found to be in boot, crash, reboot loop [17][8], hardware and
> software investigations (including Software On-Call) ultimlately
> unsuccessful [18][9]. System went down again in Owl [19][10]
> o Next step is likely swapping out the VME crate; talking to Jack for
> some support.
> o Brad will install some cameras to at least monitor the cryo
> situation at the next opportunity
>
> o Once the Hall came out of Controlled Access in early swing beam has been
> pretty good
>
> o Junhao reports the spectrum analyzer parts are ready to go for Monday
>
> o RadCon has been looped in and will support
>
> Notes for the Future
>
> o Beam Studies planned for Monday@ 10am to 6pm (including recovery), Sept
> 15
>
> o RadCon will support going to CA at 10am, we can stay in CA for
> roughly 2 hours; OPS wants Hall C dump available after that
> o Simona wants access at this time for SOLID cherenkov related work
> o Target work
>
> o Install spectrum analyzer collimator
> o Check field at target region for 270 setting, if possible
> o Want to determine field direction at the precision of a few
> degrees vs the alignment laser
>
> o Bill, Murchhana check compass/field measurements and will report
> back at Sat RC meeting
>
> o [20]1-pass runningtentatively scheduled for Sept 17/18
>
> o Hall A would like a specific date soon so they can finalize their
> end-of-run plans
>
> Pending Issues
>
> o Check EPR calibrations (particularly for 270deg setting, but others too)
> [Melanie]
> o Magnet EPICS PV timeout issue; may have to reboot skylla10 on Monday?
>
> o Some Magnets Channels Lost Connection Briefly [21][11] (Saturday,
> 2pm)
> o Also had to add more error checking to the angle reporting in the
> CODA run-start GUI last week too (same softIOC as above)
> o 'Heartbeat' issue reported by Steve Lassiter last week
>
> o Target polarization for Tommy @ 270 is low (mid to high 30s)
>
> o 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
> o JP wonders if the field direction is off for the transverse
> settings (Bill, Murchhana: see note in Target group chat from late
> Thursday)
>
> o Beam energy drifts
>
> o Hall C 5-pass polarization goes down as energy (HALLC:p) goes up
> [22][12]
>
> Opportunistic Jobs/Access
>
> o Beam Studies planned for Monday, Sept 14 (Note date change!)
>
> Target calibrations / tests
>
> o Just before Moller measurement, and/or other known downtimes
> o See [23]D2n_Run_Plan_2020#Target_Calibrations_and_Tests
>
> Current Run Plan
>
> Saturday DAY -> Saturday SWING
>
> o Continue production data (HMS Kin-C/SHMS Kin-Z) with pol 3He target,
> Transverse/90 polarization with NMR every 5 hrs.
> o [TBD] Move to Kin-A, Kin-X and continue Transverse/90 running there?
>
> Saturday OWL -> Sunday DAY
>
> o Continue production data with pol 3He target, Transverse/90 polarization
> with NMR every 5 hrs.
>
> References
>
> Visible links
> 1. https://logbooks.jlab.org/entry/3846729
> 2. https://logbooks.jlab.org/entry/3846729/edit?destination=email/send
> 3. https://logbooks.jlab.org/entry/3846729/delete?destination=email/send
> 4. https://logbooks.jlab.org/entry/3846729
> 5. https://logbooks.jlab.org/user/brads
> 6. https://logbooks.jlab.org/entries?start_date=1599937386&end_date=1599944586&book=HCLOG
> 7. https://logbooks.jlab.org/book/hclog
> 8. D2n Run Plan 2020
> https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020
> 9. https://logbooks.jlab.org/entry/3846701]
> 10. https://logbooks.jlab.org/entry/3846082
> 11. https://logbooks.jlab.org/entry/3845852
> 12. https://logbooks.jlab.org/entry/3846692
> 13. https://logbooks.jlab.org/entry/3846581
> 14. https://logbooks.jlab.org/entry/3844366
> 15. https://logbooks.jlab.org/entry/3845243
> 16. https://logbooks.jlab.org/entry/3846252
> 17. https://logbooks.jlab.org/entry/3846242
> 18. https://logbooks.jlab.org/entry/3846365
> 19. https://logbooks.jlab.org/entry/3846525
> 20. D2n Run Plan 2020
> https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020#1-pass_Running
> 21. https://logbooks.jlab.org/entry/3846677
> 22. https://logbooks.jlab.org/entry/3844493
> 23. D2n Run Plan 2020
> https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020#Target_Calibrations_and_Tests
--
Brad Sawatzky, PhD <brads at jlab.org> -<>- Jefferson Lab / Hall C / C111
Ph: 757-269-5947 -<>- Fax: 757-269-5235 -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" but "That's funny..." -- Isaac Asimov
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