Difference between revisions of "June 22, 2022"
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** during Owl shift, due to beam instability, current was reduced to 45 uA | ** during Owl shift, due to beam instability, current was reduced to 45 uA | ||
** Ops will take beam away at 6:30 am tomorrow for full maintenance day. | ** Ops will take beam away at 6:30 am tomorrow for full maintenance day. | ||
| − | + | ** someone inadvertently uploaded some settings, and entire machine will have to be cycled (at least couple of hours, "lets go with that for now", the MCC operator said) | |
* Experiment status: | * Experiment status: | ||
** pionLT continues to make progress on run plan, though we are still behind schedule, unless Ops is able to deliver 80 uA at >50% efficiency after full maintenance tomorrow. | ** pionLT continues to make progress on run plan, though we are still behind schedule, unless Ops is able to deliver 80 uA at >50% efficiency after full maintenance tomorrow. | ||
| + | ** started new setting @ 9:50 am today: LH2 SHMS Left: Q2=3.85 W=2.62 x=0.39 θ_SHMS=16.28 deg | ||
= Current Run Plan = | = Current Run Plan = | ||
| Line 52: | Line 53: | ||
= Current Issues = | = Current Issues = | ||
* shift crew continues to see HMS DC noise outbursts more frequently, see log-entries: | * shift crew continues to see HMS DC noise outbursts more frequently, see log-entries: | ||
| − | ** https://logbooks.jlab.org/entry/4005325 | + | ** See log-entries: https://logbooks.jlab.org/entry/4005325 , https://logbooks.jlab.org/entry/4005330 |
| − | + | ** study noise dependence on HMS DC thresholds, and found that noise temporarily went away @ DC threshold 5.8 V, but re-appeared on the next runs see log-entry --> https://logbooks.jlab.org/entry/4005624 This issue will have to be addressed during next Hall C access during accelerator maintenance day on Thursday Jun 23 | |
| − | * study noise dependence on HMS DC thresholds, and found that noise temporarily went away @ DC threshold 5.8 V, but re-appeared on the next runs see log-entry --> https://logbooks.jlab.org/entry/4005624 This issue will have to be addressed during next Hall C access during accelerator maintenance day on Thursday Jun 23 | + | * Hall C BCMs and Accelerator BCMc (i.e., MPS BCMs) mismatch --> https://logbooks.jlab.org/entry/4005801 |
| + | ** I would think this is just a scale factor missing between the two measurements? Usually S. Wood did this in the past. I have notified S. Wood in the log-entry | ||
= Planned Accesses to the Hall = | = Planned Accesses to the Hall = | ||
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* During the accelerator full maintenance day (Thursday Jun 23, 2022) | * During the accelerator full maintenance day (Thursday Jun 23, 2022) | ||
**S. Lassiter needs to put crush washers in LCW filters, so we may see a little bit of water by the HMS boogie for now, until he can put the washers next week, during maintenance period [https://logbooks.jlab.org/entry/4003796 HMS Dipole LCW] (<span style="color:red"> '''PENDING''' </span>) NOTE: Actually, Heidi and Jack will will need to access Hall C to work on HMS dipole, to get dimensions before ordering the parts needed to install the crush washers. | **S. Lassiter needs to put crush washers in LCW filters, so we may see a little bit of water by the HMS boogie for now, until he can put the washers next week, during maintenance period [https://logbooks.jlab.org/entry/4003796 HMS Dipole LCW] (<span style="color:red"> '''PENDING''' </span>) NOTE: Actually, Heidi and Jack will will need to access Hall C to work on HMS dipole, to get dimensions before ordering the parts needed to install the crush washers. | ||
| − | ** | + | ** Hall C drift-chamber expert will need to go to the HMS Hut to try and fix the HMS DC noise issues. Maybe better grounding is required? Or discriminator cards may need to be re-seated? (<span style="color:red"> '''PENDING''' </span>) See HMS DC Card Map: https://hallcweb.jlab.org/wiki/images/1/11/HMS_DriftChamberPlanesLayout.pdf and log-entry: https://logbooks.jlab.org/entry/4005562 describing which wire groups are noisy |
**Xinzhan Bai and Jixie Zhang request to change gas bottle for solid Cherenkov detector: Contact: xbai@jlab.org, cell: (434) 422-2809 (<span style="color:red"> '''PENDING''' </span>) | **Xinzhan Bai and Jixie Zhang request to change gas bottle for solid Cherenkov detector: Contact: xbai@jlab.org, cell: (434) 422-2809 (<span style="color:red"> '''PENDING''' </span>) | ||
= Planned Accelerator Configuration Changes = | = Planned Accelerator Configuration Changes = | ||
| − | + | * Full accelerator maintenance day on Thursday, Jun 23. Beam will be taken away at 6:30 am | |
| − | * Full accelerator maintenance day on Thursday, Jun 23. | ||
= Special Requests = | = Special Requests = | ||
* Mark Jones would like to take HMS optics data with a 4x4 mm^2 raster at some point (when HMS is at a lower momentum, i.e., current setting) for checks. (<span style="color:darkgreen"> '''DONE''' </span>) | * Mark Jones would like to take HMS optics data with a 4x4 mm^2 raster at some point (when HMS is at a lower momentum, i.e., current setting) for checks. (<span style="color:darkgreen"> '''DONE''' </span>) | ||
** D. Gaskell took a run with Carbon target and raster set to 4x4 mm^2. See run https://logbooks.jlab.org/entry/4004280 | ** D. Gaskell took a run with Carbon target and raster set to 4x4 mm^2. See run https://logbooks.jlab.org/entry/4004280 | ||
Latest revision as of 09:56, 22 June 2022
RC Meeting Information
RC Daily Meetings are at 11:00 (am) via Zoom and in person in the counting house meeting room (2nd floor)
- Zoom remote connection information:
Join ZoomGov Meeting https://jlab-org.zoomgov.com/j/1607100885?pwd=ZFBsRTFsYm5Zb0laZ0tyZXNjcEE0QT09 Meeting ID: 160 710 0885 Passcode: 595071 One tap mobile +16692545252,,1607100885# US (San Jose) +16468287666,,1607100885# US (New York) Dial by your location +1 669 254 5252 US (San Jose) +1 646 828 7666 US (New York) +1 669 216 1590 US (San Jose) +1 551 285 1373 US 833 568 8864 US Toll-free Meeting ID: 160 710 0885 Find your local number: https://jlab-org.zoomgov.com/u/ab2CekLXgQ
Useful Links
- Shift Signup (Read only)
- PionLT_2022_Physics_Status
- KaonLT Logbook - Used for PionLT updates too
- Physics analysis updates should be cross posted here
- Run Plans
- Hall-C Controls
- Hall-C Logbook
- MCC White Board
Current Status
- Accelerator status:
- Yesterday swing shift, Ops was able to bring Hall C to ~ 81 uA for 1-2 sec. before it tripped (testing the machine)
- Ops was able to deliver 60 uA of relatively stable beam during second half of swing shift
- during Owl shift, due to beam instability, current was reduced to 45 uA
- Ops will take beam away at 6:30 am tomorrow for full maintenance day.
- someone inadvertently uploaded some settings, and entire machine will have to be cycled (at least couple of hours, "lets go with that for now", the MCC operator said)
- Experiment status:
- pionLT continues to make progress on run plan, though we are still behind schedule, unless Ops is able to deliver 80 uA at >50% efficiency after full maintenance tomorrow.
- started new setting @ 9:50 am today: LH2 SHMS Left: Q2=3.85 W=2.62 x=0.39 θ_SHMS=16.28 deg
Current Run Plan
pionLT Summer 2022 Run Plan
Physics Status
Notices in Effect for Shift Crew
- Please pro-rate ABU for max current limit in run plan (uA) in beam time accounting. For example, if we receive 15 uA instead of the max_current_limit in the run plan, then the ABU should be: ABU_prorated = 15/(max current limit) * ABU
- Check the HMS/SHMS rates for when production starts, since for Heep coin. production SHMS saw higher rates. Make sure shift crew takes snapshot of scalers at every setting
- When analyzing LD2 or Al dummy or LH2, please leave the target_mass_amu in the standard.kinematics as that of the proton, but when analyzing the data with the pionLT script, specify the target used, as different targets will have different ranges in the cuts when integrating the missing mass peak. Refer to log entry: https://logbooks.jlab.org/entry/4005387 These instructions are given in the pionLT run plan.
Current Issues
- shift crew continues to see HMS DC noise outbursts more frequently, see log-entries:
- See log-entries: https://logbooks.jlab.org/entry/4005325 , https://logbooks.jlab.org/entry/4005330
- study noise dependence on HMS DC thresholds, and found that noise temporarily went away @ DC threshold 5.8 V, but re-appeared on the next runs see log-entry --> https://logbooks.jlab.org/entry/4005624 This issue will have to be addressed during next Hall C access during accelerator maintenance day on Thursday Jun 23
- Hall C BCMs and Accelerator BCMc (i.e., MPS BCMs) mismatch --> https://logbooks.jlab.org/entry/4005801
- I would think this is just a scale factor missing between the two measurements? Usually S. Wood did this in the past. I have notified S. Wood in the log-entry
Planned Accesses to the Hall
- During the accelerator full maintenance day (Thursday Jun 23, 2022)
- S. Lassiter needs to put crush washers in LCW filters, so we may see a little bit of water by the HMS boogie for now, until he can put the washers next week, during maintenance period HMS Dipole LCW ( PENDING ) NOTE: Actually, Heidi and Jack will will need to access Hall C to work on HMS dipole, to get dimensions before ordering the parts needed to install the crush washers.
- Hall C drift-chamber expert will need to go to the HMS Hut to try and fix the HMS DC noise issues. Maybe better grounding is required? Or discriminator cards may need to be re-seated? ( PENDING ) See HMS DC Card Map: https://hallcweb.jlab.org/wiki/images/1/11/HMS_DriftChamberPlanesLayout.pdf and log-entry: https://logbooks.jlab.org/entry/4005562 describing which wire groups are noisy
- Xinzhan Bai and Jixie Zhang request to change gas bottle for solid Cherenkov detector: Contact: xbai@jlab.org, cell: (434) 422-2809 ( PENDING )
Planned Accelerator Configuration Changes
- Full accelerator maintenance day on Thursday, Jun 23. Beam will be taken away at 6:30 am
Special Requests
- Mark Jones would like to take HMS optics data with a 4x4 mm^2 raster at some point (when HMS is at a lower momentum, i.e., current setting) for checks. ( DONE )
- D. Gaskell took a run with Carbon target and raster set to 4x4 mm^2. See run https://logbooks.jlab.org/entry/4004280
