Difference between revisions of "Run Planning Meeting Notes, Mar 04-Mar 11, 2020"

Revision as of 08:32, 9 March 2020

Last 72 hours
- Issues with delivering full current to A/C. Back up now, but no RF recovery planned/available to recover gradient(?)
- Production running when beam available over the weekend
Reports/Issues
- Rates instability: "dip" in rate on Friday evening.
  - beam off to other halls showed no change to PS rate
  - Harp scan taken during dip: analysis by shift crew (HALO:T:gamma) and Hovanes (HALO:T:electron) and Jay's convergence
  - Since then the rate has been ~stable
- Multiple processes running to different edge fitting scripts caused fluctuations (Mark D)
  - New edge fitting script in use to better monitor edge and width (Mark D)
- Collecting events before run start
- Monitoring: BCAL hot channel --> pedestal calibration needed (Mark)
- something weird is fixed, was a bad ADC channel (Beni)
- gluonraid2 filled up and emptied by hand (David)
- Bad data from CAEN HV and intermittent LINK alarms (Hovanes)
Run Plan (Friday + Weekend)
- Production
Longer term
- Hall C down for configuration change 3/13-3/20. Good opportunity for low current TAC run.

Last 24 hours
- Limited beam yesterday morning, followed by Hall access for Solenoid VCL work (Scot/Mark)
- Steady production evening and overnight
Reports/Issues
- Rates instability: Added additional beam positions to "default" MyaViewer
  - No major instability overnight. Still plan to request other Hall beam off and Harp Scan if another "dip" in rate of 30% or more is identified by shift crew.
  - Look back at other halls during previous instabilities (Alexandre)
- Fluctuating coherent edge for 45/135 PERP (Naomi)
- ρ and ω yield/trigger (almost) back to nominal values:
  - Initial CCDB time stamp update (Alex)
  - Followup to revert TOF timewalk calibration (Beni)
- something weird (Beni)
- Updated reference plots: thanks Naomi! Experts please check your e-mails. [1]
- Bad data from CAEN HV and intermittent LINK alarms (Hovanes)
Run Plan (Friday + Weekend)
- May be some additional (short) injector tuning (A2 interception) today to keep Hall A's charge asymmetry down.
- Production
Longer term
- Hall C down for configuration change 3/13-3/20. Good opportunity for low current TAC run.

Last 24 hours
- Beam off until Wednesday @ 5 pm for injector work
- FCAL work and restoration
  - New PDU installed (Nick)
  - Restoration: [2][3] (Nick/Colin)
- Solenoid Vapor Cooled Lead (VCL) temperature drop (Mark)
Reports/Issues
- Accelerator status GUI (Naomi)
- Tagger magnet NMR signal (Tim)
- Tagger field change to photon energy calibration (Richard)
- Bad data from CAEN HV and intermittent LINK alarms (Hovanes)
- ρ and ω yield/trigger back to nominal values: e.g. Run 72076 (Alex)
  - Change of timestamp (Logbook entry?)
- Rates instability (Alexandre)
Run Plan
- Opportunistic access for solenoid work in parallel with injector tuning (1:00 pm)
- Production

@@ Line 9: / Line 9: @@
 #* Rates instability: "dip" in rate on Friday evening.
 #** [https://logbooks.jlab.org/entry/3798772 beam off to other halls showed no change to PS rate]
-#** Harp scan taken during dip: analysis by [https://logbooks.jlab.org/entry/3798744 shift crew (HALO:T:gamma)] and [https://logbooks.jlab.org/entry/3798822 Hovanes (HALO:T:electron)]
+#** Harp scan taken during dip: analysis by [https://logbooks.jlab.org/entry/3798744 shift crew (HALO:T:gamma)] and [https://logbooks.jlab.org/entry/3798822 Hovanes (HALO:T:electron)] and  [https://logbooks.jlab.org/entry/3799097 Jay's convergence]
 #** Since then the rate has been ~stable
-#* [https://logbooks.jlab.org/entry/3799097 Convergence]
 #* Multiple processes running to different edge fitting scripts caused fluctuations (Mark D)
-#** New edge fitting script in use to better [https://logbooks.jlab.org/entry/3799337 monitor edge and width] (Mark D)
+#** New [https://logbooks.jlab.org/entry/3798680 edge fitting script] in use to better [https://logbooks.jlab.org/entry/3799337 monitor edge and width] (Mark D)
 #* [https://logbooks.jlab.org/entry/3799518 Collecting events before run start]
 #* Monitoring: [https://logbooks.jlab.org/entry/3799996 BCAL hot channel] --> pedestal calibration needed (Mark)