Difference between revisions of "RC Update and Run Plan for Tuesday, March 10, 2020"
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=General updates: = | =General updates: = | ||
− | + | ||
+ | * Monday OWL changed to '''longitudinal''' target production at 05:46, nominal HMS/SHMS -3.5/-3.4 GeV data with 3He target. | ||
+ | * Cascade failures following a valve closure kept beam off for most of Tuesday DAY shift. | ||
− | * | + | * After the Tuesday RC meeting, the 1 hour "Be window background run" was completed. This changes the dominant scatterers in the SHMS from "Be windows + 3He target" to "Be windows + N2 at atmospheric pressure". Ironically, Zhiwen says the rate increased, perhaps a teachable moment in how thin the 3He target is. |
− | + | ||
− | + | ||
− | * | + | * Sylvester thought the scraping had returned on the 3He cell. https://logbooks.jlab.org/entry/3801476 Xiaochao had us move the beam spot by another 0.5 mm in the negative X direction. (Done in 0.1 mm steps.) Need more statistics, but there seems to be no scraping now. https://logbooks.jlab.org/entry/3801594 Jingyi has updated the nominal beam position on the paper sheet on the wall. https://logbooks.jlab.org/entry/3801590 |
+ | * Resumed '''longitudinal''' target production at 05:46, nominal HMS/SHMS -3.5/-3.4 GeV data with 3He target. <font color="red">ONGOING AS OF TUE SWING </font> | ||
− | * | + | * Let me know about any '''non-pivot''' work you'd like to take place during the March 13-20 down in Hall C. So far on the list we've got |
+ | ** a 3He compressor checkout for the x > 1 experiment next year (Meekins/RadCon); | ||
+ | ** a hopefully straightforward SHMS dipole PS relay replacement followed by testing (Lassiter/Segal); | ||
+ | ** and an important SOLID detector test the scope of which is defined in the HClist http://devweb.acc.jlab.org/CSUEApps/hclist/task/1809 (Malace et al). | ||
+ | (The pivot work has been planned in great detail. I just want a list of anything 'else' so we don't trip over ourselves, and so the next RC can brace himself for a week of cat herding.) | ||
+ | |||
+ | * Don't forget the temporary instructions for shift members regarding SHMS dipole power supply : https://logbooks.jlab.org/entry/3800710 . | ||
+ | |||
+ | * 4 target polarization measurements since Monday SWING: 54.3%, 52.0%, 58.6%, and 57.6%, all L. The latter too-good-to-be-true numbers triggered an effort on day shift to adjust the heaters until good convection was re-established. | ||
= Current Run Plan: = | = Current Run Plan: = | ||
+ | == Tuesday SWING to Wednesday SWING == | ||
+ | * <font color="red">DONE</font> Resume '''longitudinal''' production data taking with target at 180 deg, take NMR every 5 hours. | ||
+ | |||
+ | * <font color="red">DONE</font> Execute the three-step Be window background measurement is this: | ||
+ | ** final check on details with the spokes at Tuesday RC meeting | ||
+ | ** move to target OUT position, | ||
+ | ** run for one hour-ish at nominal 30 muA, using impeccable judgement to adjust the time if there are beam delivery issues. | ||
− | |||
* <font color="red">ONGOING</font> Resume '''longitudinal''' production data taking with target at 180 deg, take NMR every 5 hours. | * <font color="red">ONGOING</font> Resume '''longitudinal''' production data taking with target at 180 deg, take NMR every 5 hours. | ||
+ | |||
+ | (longer term: We're expecting a <font color="red"> Moller measurement on Thursday </font> , the day before Hall C goes down for a week for the coil rotation for the d2n experiment.) | ||
− | |||
{{:PolHe3_Target_Coil_Rotation_Plan,_Mar_2020}} | {{:PolHe3_Target_Coil_Rotation_Plan,_Mar_2020}} |
Latest revision as of 19:46, 10 March 2020
Contents
RC Meeting Information
RC Daily Meetings are M-F at 4:15 PM, 2nd floor Counting House Meeting Room Bluejeans Connection
Tuesday, March 10, 2020.
General updates:
- Monday OWL changed to longitudinal target production at 05:46, nominal HMS/SHMS -3.5/-3.4 GeV data with 3He target.
- Cascade failures following a valve closure kept beam off for most of Tuesday DAY shift.
- After the Tuesday RC meeting, the 1 hour "Be window background run" was completed. This changes the dominant scatterers in the SHMS from "Be windows + 3He target" to "Be windows + N2 at atmospheric pressure". Ironically, Zhiwen says the rate increased, perhaps a teachable moment in how thin the 3He target is.
- Sylvester thought the scraping had returned on the 3He cell. https://logbooks.jlab.org/entry/3801476 Xiaochao had us move the beam spot by another 0.5 mm in the negative X direction. (Done in 0.1 mm steps.) Need more statistics, but there seems to be no scraping now. https://logbooks.jlab.org/entry/3801594 Jingyi has updated the nominal beam position on the paper sheet on the wall. https://logbooks.jlab.org/entry/3801590
- Resumed longitudinal target production at 05:46, nominal HMS/SHMS -3.5/-3.4 GeV data with 3He target. ONGOING AS OF TUE SWING
- Let me know about any non-pivot work you'd like to take place during the March 13-20 down in Hall C. So far on the list we've got
- a 3He compressor checkout for the x > 1 experiment next year (Meekins/RadCon);
- a hopefully straightforward SHMS dipole PS relay replacement followed by testing (Lassiter/Segal);
- and an important SOLID detector test the scope of which is defined in the HClist http://devweb.acc.jlab.org/CSUEApps/hclist/task/1809 (Malace et al).
(The pivot work has been planned in great detail. I just want a list of anything 'else' so we don't trip over ourselves, and so the next RC can brace himself for a week of cat herding.)
- Don't forget the temporary instructions for shift members regarding SHMS dipole power supply : https://logbooks.jlab.org/entry/3800710 .
- 4 target polarization measurements since Monday SWING: 54.3%, 52.0%, 58.6%, and 57.6%, all L. The latter too-good-to-be-true numbers triggered an effort on day shift to adjust the heaters until good convection was re-established.
Current Run Plan:
Tuesday SWING to Wednesday SWING
- DONE Resume longitudinal production data taking with target at 180 deg, take NMR every 5 hours.
- DONE Execute the three-step Be window background measurement is this:
- final check on details with the spokes at Tuesday RC meeting
- move to target OUT position,
- run for one hour-ish at nominal 30 muA, using impeccable judgement to adjust the time if there are beam delivery issues.
- ONGOING Resume longitudinal production data taking with target at 180 deg, take NMR every 5 hours.
(longer term: We're expecting a Moller measurement on Thursday , the day before Hall C goes down for a week for the coil rotation for the d2n experiment.)
Target coil rotation planned for March 13--20
- Nominal 1-week downtime in Hall C to rotate target coils, install new cell, and transition to d2n program
- More details are here: PolHe3_Target_Coil_Rotation_Plan,_Mar_2020
Notes for the Future
- 'Filler' runs for next spin up / target-down period (Don't want to forget about this!):
- 1 hour run with target out for measure of the background just from the beryllium windows. (Needs SHMS, btw.)
Pending Issues (new stuff in red)
- A replacement laser interlock jumper needs to be made and installed as soon as possible.
- Maybe we can ask Mike Fowler for a "cycled" flag on the magnet screens for Xmas?
- pNMR issues
- Software/driver issue needs to be resolved
- Checkout during next non-production down time (Moller or SHMS fix)
- EPR problems [1] saw some progress on Tuesday [2], 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 commissioning/installation (Todd, Bill) (Bill got a filter design from the vendor and has ordered parts.)
- Verify that calibration constants and input values associated with NMR and other polarimetry are consistent and will be correct when the software is restarted [3] [4] [5] [6] [7] (Bill, Junhao)
- Persistent BLM & 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)
- 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
- OPs wished to reboot hung iochc10 [8], noted in December as well [9]
- 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 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.
- Magnet policies
- Spectrometer GUI (
go_magnets
) 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.
- Spectrometer GUI (
- 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[10]
Bluejeans remote connection information
To join the Meeting: https://bluejeans.com/861439920 To join via Room System: Video Conferencing System: bjn.vc -or-199.48.152.152 Meeting ID : 861439920 To join via phone : 1) Dial: +1.408.740.7256 (US (San Jose)) +1.888.240.2560 (US Toll Free)) +1.408.317.9253 (US (Primary, San Jose)) (see all numbers - http://bluejeans.com/numbers) 2) Enter Conference ID : 861439920
Useful Links
Target Polarization Angle Conventions
Be VERY clear here about the convention (beam-right/left/up/downstream) vs 0, 90, 180, 270) for each run period. More notes and references to log entries are better.
Polarization Calibration Data
ADD LIST OF CALIBRATION RUNS HERE AND A TABLE OF RELEVANT CALIBRATION CONSTANTS TO USE FOR WHAT RUNS
Cell | Calibration Type |
SHMS Angle /degree |
SHMS Momentum /GeV |
Field Direction /degree |
Calibration Results | Status | Oven Temperature /°C |
Log# |
---|---|---|---|---|---|---|---|---|
Tommy | EPR-NMR | 11 | 7.5 | 90 | 5.24 %/mV | Done | 200 | 3839939 |
Tommy | EPR-NMR | 18 | 5.6 | 270 | 5.04(1) %/mV | Done | 205 | 3843301 |
Tommy | EPR-NMR | 18 | 5.6 | 90 | undone | 205 | ||
Tommy | EPR-NMR | 11 | 7.5 | 270 | undone | 208 | ||
Tommy | AFP Loss | 14.5 | 6.4 | 90 | 1.25%/Sweep | Done | 200 | 3840618, 3840143, 3840618 |
Tommy | EPR Amplifier on/off NMR Signal |
11 | 7.5 | 90 | Done | 200 | 3839962 | |
Tommy | Temperature Test | 18 | 5.6 | 90 | Done | 205 | 3844089 | |
Tommy | AFP Loss | 18 | 5.6 | 270 | Done | 205 | 3845255 | |
Tommy | Temperature Test | 18 | 5.6 | 270 | Done | 205 | 3845336 | |
Briana | EPR-NMR | 18 | 5.6 | 180 | 8.60 | Done | 205 | 3834036, 3834243 |
Briana | EPR-NMR | 18 | 5.6 | 270 | 5.6 | Done | 205 | 3835512, 3835587 |
Austin | EPR-NMR | 18 | 5.6 | 90 | 4.88 | Done | 200 | 3814717 |
Austin | EPR-NMR | 11 | 7.5 | 180 | 7.64 | Done | 210 | 3817200 |
Austin | EPR-NMR | 11 | 7.5 | 0 | 8.13 | Done | 210 | 3818761 |
Austin | EPR-NMR | 11 | 7.5 | 270 | 4.56 | Done | 210 | 3819882 |
Austin | EPR-NMR | 11 | 7.5 | 270 | 4.58 | Done | 210 | 3822296 |
Austin | EPR-NMR | 11 | 7.5 | 90 | 4.91 | Done | 210 | 3824907 |
Austin | EPR-NMR | 18 | 0 | 90 | 4.58 | Done | 210 | 3815895 |
Austin | EPR-NMR | 11 | 0 | 180 | 6.91 | Done | 210 | 3816724 |
Target Polarization Database
d2n Run Period
D2n Target Run List: https://docs.google.com/spreadsheets/d/16TrIUXVA-znVNUyEKy9FHaIlcvq-KXzu97k9nJowuE8/edit#gid=0
- Junhao Chen is maintaining it
A1n Run Period
- Mingyu Chen will updating the runlist while Murchhana Roy will do the cross check.
Recent polarization measurements
PolHe3 Polarization Measurements
- longitudinal polarization measurements after yesterday's target work in the hall and QWP angle optimization
- Tue 2/18 13:15: 47% https://logbooks.jlab.org/entry/3786686
- Tue 2/18 18:42: 52.2% https://logbooks.jlab.org/entry/3786898
- Tue 2/18 23:47: 54.5% https://logbooks.jlab.org/entry/3787175
- Wed 2/19 4:38: 55.0% https://logbooks.jlab.org/entry/3787175
- Wed 2/19 8:40: 54.9% https://logbooks.jlab.org/entry/3787285
- Wed 2/19 13:08 54.8% https://logbooks.jlab.org/entry/3787420
- Wed 2/19 18:15 54.8% https://logbooks.jlab.org/entry/3787605
- Wed 2/19 11 PM 55.3% https://logbooks.jlab.org/entry/3787781
- Wed 2/19 midnight 51.9% https://logbooks.jlab.org/entry/3787926
- Thu 2/20 05:15 53.2% https://logbooks.jlab.org/entry/3787904
- Thu 2/20 10:34 53.6% https://logbooks.jlab.org/entry/3788085
- Thu 2/20 13:47 53.0% https://logbooks.jlab.org/entry/3788210
- Thu 2/20 21:00 56.0% https://logbooks.jlab.org/entry/3788428
- Fri 2/21 04:07 55.2% L https://logbooks.jlab.org/entry/3788613
- Fri 2/21 09:03 53.8% L https://logbooks.jlab.org/entry/3788795
- Fri 2/21 14:22 52.5% L https://logbooks.jlab.org/entry/3788938
- Fri 2/21 19:50 51.9% L https://logbooks.jlab.org/entry/3789160
- Sat 2/22 01:15 51.6% L https://logbooks.jlab.org/entry/3789331 -> QWP optimization done
- Sat 2/22 06:32 53.0% L https://logbooks.jlab.org/entry/3789442
- Sat 2/22 11:50 54.9% L https://logbooks.jlab.org/entry/3789583 -> rotated to T (5hr) then back to L (2-3hrs)
- Sat 2/22 19:31 43.2% L https://logbooks.jlab.org/entry/3789857
- Sat 2/22 23:08 50.2% L https://logbooks.jlab.org/entry/3789959
- Sun 2/23 04:06 55.3% L https://logbooks.jlab.org/entry/3790104
- Sun 2/23 09:21 55.5% L https://logbooks.jlab.org/entry/3790240
- Sun 2/23 14:17 55.7% L https://logbooks.jlab.org/entry/3790380
- Sun 2/23 19:03 55.7% L https://logbooks.jlab.org/entry/3790513
- Mon 2/24 00:25 55.2% L https://logbooks.jlab.org/entry/3790672
- Mon 2/24 05:47 49.6% L https://logbooks.jlab.org/entry/3790771 -> unexplained drop
- Mon 2/24 10:59 50.8% L https://logbooks.jlab.org/entry/3790965
- Mon 2/24 15:51 50.4% L https://logbooks.jlab.org/entry/3791100
- Mon 2/24 21:22 50.9% L https://logbooks.jlab.org/entry/3791318
- Tue 2/25 02:59 50.7% L https://logbooks.jlab.org/entry/3791481 -> QWP optimization done
- Tue 2/25 08:30 51.4% L https://logbooks.jlab.org/entry/3791660
- Tue 2/25 18:13 ~50% L https://logbooks.jlab.org/entry/3791950
- Tue 2/25 23:13 53.3% L https://logbooks.jlab.org/entry/3792124
- Wed 2/26 04:34 53.6% L https://logbooks.jlab.org/entry/3792291
- Wed 2/26 09:04 54.3% L https://logbooks.jlab.org/entry/3792418 -- NMR just after beam stops
- Wed 2/26 12:46 50.1% L https://logbooks.jlab.org/entry/3792504 -- NMR before beam returns
- Wed 2/26 18:44 52.8% L https://logbooks.jlab.org/entry/3792704
- Wed 2/26 23:42 53.8% L https://logbooks.jlab.org/entry/3792849
- Thu 2/27 04:43 56.4% L https://logbooks.jlab.org/entry/3792931 -- not much beam during owl
- Thu 2/27 08:38 56.3% L https://logbooks.jlab.org/entry/3793085
- Thu 2/27 08:38 56.3% L https://logbooks.jlab.org/entry/3793085
- Thu 2/27 16:50 58.4% L https://logbooks.jlab.org/entry/3793359 -- not much beam during day shift (Moller + retune)
- Thu 2/27 21:49 58.0% L https://logbooks.jlab.org/entry/3793493
- Fri 2/28 02:53 57.8% L https://logbooks.jlab.org/entry/3793610
- Fri 2/28 07:41 57.9% L https://logbooks.jlab.org/entry/3793727
- Fri 2/28 12:54 58.5% L https://logbooks.jlab.org/entry/3793881 -- just before beam restart; after EPR hardware misconfiguration was corrected
- Fri 2/28 18:04 57.2% L https://logbooks.jlab.org/entry/3794035
- Fri 2/28 18:19 49.8% (55.7%) T https://logbooks.jlab.org/entry/3794045 -- value in () is with updated calib. coefficient
- Fri 2/28 20:21 49.2% (55.1%) T https://logbooks.jlab.org/entry/3794079 -- value in () is with updated calib. coefficient
- Sat 2/29 00:37 --- % T https://logbooks.jlab.org/entry/3794242 -- Transverse NMR did not work
- Sat 2/29 01:03 52.5% L https://logbooks.jlab.org/entry/3794244
- Sat 2/29 06:10 54.3% L https://logbooks.jlab.org/entry/3794356
- Some problematic NMR measurements around 12:00--12:14? [11]
- Sat 2/29 12:25 52.8% L https://logbooks.jlab.org/entry/3794512
- Sat 2/29 17:49 54.8% L https://logbooks.jlab.org/entry/3794693
- Sat 2/29 22:51 54.4% L https://logbooks.jlab.org/entry/3794802
- Sun 3/01 03:58 53.9% L https://logbooks.jlab.org/entry/3794944
- Sun 3/01 09:42 54 % L https://logbooks.jlab.org/entry/3795082
- Sun 3/01 11:00 ----- https://logbooks.jlab.org/entry/3795123 -- Re-analyzed some odd sweeps from Sat DAY shift
- Sun 3/01 14:33 54.5% L https://logbooks.jlab.org/entry/3795265
- Sun 3/01 19:58 54.1% L https://logbooks.jlab.org/entry/3795414
- Mon 3/02 01:06 54.1% L https://logbooks.jlab.org/entry/3795560
- Mon 3/02 06:08 53.9% L https://logbooks.jlab.org/entry/3795662
- Mon 3/02 11:08 53.9% L https://logbooks.jlab.org/entry/3795836 -- before switching to Transverse
- Mon 3/02 11:32 52.5% T https://logbooks.jlab.org/entry/3795851
- Mon 3/02 15:04 54.4% T https://logbooks.jlab.org/entry/3795982 -- just before production beam
- Mon 3/02 17:41 https://logbooks.jlab.org/entry/3796117 -- NMR PC Transverse Calibration constant updated
- Mon 3/02 20:37 53.9% T https://logbooks.jlab.org/entry/3796180
- Mon 3/02 20:46 52.9% L https://logbooks.jlab.org/entry/3796182
- Tue 3/03 00:47 55.6% L https://logbooks.jlab.org/entry/3796277
- Tue 3/03 05:36 54.7% L https://logbooks.jlab.org/entry/3796415
- Tue 3/03 08:19 54.7% L https://logbooks.jlab.org/entry/3796485