Difference between revisions of "October 29, 2023"

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[https://hallcweb.jlab.org/wiki/index.php/RC_Daily_Meetings:_NPS Back to previous page]
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<b> RC Daily Meetings are at 11:00 (am) via Zoom and in person in the counting-house meeting room (2nd floor) </b>
 
<b> RC Daily Meetings are at 11:00 (am) via Zoom and in person in the counting-house meeting room (2nd floor) </b>
 
* Zoom remote connection information:
 
* Zoom remote connection information:
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= Past 24 hours =
 
= Past 24 hours =
−
In the past 24 hours, we completed the Moller measurement at 14:30 (1.5 hours ahead of the schedule) and resumed the data production at kinematics KinC_x36_5. The spokespersons agreed to change the NPS spectrometer to a slightly different angle for the remaining cycles of kinematic KinC_x36_5, (30.69 deg in the standard configuration it was at 28.417 deg), at this nonstandard setting the corrector coils can be turned off. Thanks to MCC, we verified that this was the case and continued with the production.
 
  
−
Overnight was a smooth production. We collected 1 complete cycle plus  LD2 + LH2 data of the 2nd cycle (we have enough dummy and DAQ calibration data to support the analysis).  
+
Since the last update, we have been in the production phase. However, there were a few issues and downtime:
 +
* SHMS Helium level reading glitch (https://logbooks.jlab.org/entry/4210957). A glitchy meter causes the SHMS Dipole to overflow. Heidi was manually stabilizing it and determined it would be best to access the hall and replace the meter. Escorted access was set at
 +
20:10 last night. At the same time the NPS crew went into the hall and uncabled the PMT column #3.
 +
* 5:00 am, NPS Chiller coolant, and crystal zone back temperature sensor below the lo-lo limit. This is a re-occurring issue. If not addressed immediately (within the hour), it would trip off the NPS detector HV interlock. Attempts to reach Aaron Brown were made and failed. Carlos (from France) remotely connected and temporarily set the tripping time limit from 1 hour to 8 hours. Which would give us enough time to address the issue. 13:00pm, Aadon replied and disabled two temperature sensors (one of them was bad and causing the issue) which might trip the interlock. Short-term-wise, the NPS chiller will no longer be able to trip HV interlock from the NPS temperature or coolant sensors.  
  
−
As planned at 9:30 a.m. today, we started to change to the new setting: KinC_x50_4. Current setting theta_HMS -5.253 GeV, SHMS_angle =31.747 deg, and the HMS angle = 16.917.  
+
Since run #2383, 12:55, we introduced a new trigger threshold based on Alex's suggestion (reducing the two-photon threshold from 750 to 650).
  
−
11:00-14:40 a.m., we had a DAQ-related issue, many thanks to (Wassim, Chandan, Bob, and others) for finally fixing these issues. see details here: https://logbooks.jlab.org/entry/4210759 , There was also a SHMS sensor clitch that caused an overflow, Heidi was very fast to remotely resolve the issue: https://logbooks.jlab.org/entry/4210989
+
Additionally, to further improve the smoothness of the data production, the spokespersons jointly made decisions to take action to eliminate the above issues in future runnings:
 +
* If possible, turn off (warm-up) SHMS dipole during an accelerator maintenance day.
 +
* Disabling the interlock tripping features in the NPS temperature and coolant.
 +
* Shift crews no longer are required to fill in all details on the run sheet. For a new configuration, start a new page and carefully fill in all of the details;  if the configuration stays the same, one kinematics setting, date, and initial are required;
  
 
= Current Status =
 
= Current Status =
−
* Production
+
* Production with the newly reduced two-photon threshold.
−
* RC summary: https://logbooks.jlab.org/entry/4211111
+
* If possible run LD2 production runs (1 hour long) at 35uA
  
−
= Current Run Plan =  
+
= Near Future Plan =  
−
#. We will likely postpone the Monday corrector coil beam steering test, to the next setting change, since the current setting doesn't require the corrector coil.
+
# We will postpone the Monday corrector coil beam steering test, to the next setting change, since the current setting doesn't require the corrector coil.
−
 
+
# Wednesday, November 2, 7:30 a.m.: sweep the hall open for maintenance first thing in the morning. We will attempt the following maintenance items:
−
#. Wednesday, November 2, 7:30 a.m.: sweep the hall open for maintenance first thing in the morning.
+
## NPS students will remove all PMTs + bases from column. Hall tech support is needed for this part.
−
We will attempt the following maintenance items:
+
## NPS shielding installation if ready
−
##. NPS students remove/replace damaged PMT/base.
+
## Heidi is looking into the possibility of warming up the SHMS dipole. If feasible, SHMS dipole will be warmed up.
−
##. NPS shielding installation if ready
+
## Chandan and Dave Mac checking/maintaining will access and check the HMS hodoscope patch panel. to address this issue: https://logbooks.jlab.org/entry/4210267
−
##. Ellen and Heidi for Cryo component check?
+
## Aaron will push new code for the NPS chiller controller.
−
##. Chandan (and Dave Mac) checking/maintaining HMS hodoscope. to address this issue: https://logbooks.jlab.org/entry/4210267
+
# Tuesday, October 31, 11:00 a.m.: We will invite Vald to give an insight into the high radiation test results.
−
#. Do the DAQ experts need to do something?
 
 
I am sure the maintenance list will grow as we get closer to Wednesday.
 
I am sure the maintenance list will grow as we get closer to Wednesday.
−
 
−
#. Tuesday, November 3, 11:00 a.m.:
 
−
We will invite Vald to give an insight into the high radiation test results.
 
−
 
−
There will be a meeting tomorrow to discuss a few remaining questions and decisions:
 
−
#. Adjust the triggers/running condition at the current setting.
 
−
#. Final decision on Monday corrector coil steering study.
 
−
#. Maintenance day planning.
 
−
#. Potential report from Vlad on the radiation damage study.
 
−
 
 
−
* Continue production
 
−
* Half wave plane change at 11 a.m.
 
−
* Moller measurement starting 8:30 a.m., last Friday for the day shift.
 
−
 
−
= A few new/raised concerns: =
 
−
* During the DAQ Coda configuration changes, the instruction is very unclear if a "RESET" procedure is needed. We need to make the wiki instructions clear on this part. Because of this ambiguity, we potentially might have lost 1 good run on this.
 
−
* Part of the run plan requires changing settings, and beam current, frequently, as a result, the run sheets are not completely filled.
 
−
* DAQ crashes during the run-ending process, in this case, the Run End log is not generated. It is not clear how to keep records for such runs
 
  
 
=Special Studies=
 
=Special Studies=

Latest revision as of 08:40, 30 October 2023

Back to previous page

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:
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 Meeting ID: 161 701 5555
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 Dial by your location
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 Meeting ID: 160 710 0885
 Find your local number: https://jlab-org.zoomgov.com/u/ab2CekLXgQ

Useful Links

Past 24 hours

Since the last update, we have been in the production phase. However, there were a few issues and downtime:

  • SHMS Helium level reading glitch (https://logbooks.jlab.org/entry/4210957). A glitchy meter causes the SHMS Dipole to overflow. Heidi was manually stabilizing it and determined it would be best to access the hall and replace the meter. Escorted access was set at

20:10 last night. At the same time the NPS crew went into the hall and uncabled the PMT column #3.

  • 5:00 am, NPS Chiller coolant, and crystal zone back temperature sensor below the lo-lo limit. This is a re-occurring issue. If not addressed immediately (within the hour), it would trip off the NPS detector HV interlock. Attempts to reach Aaron Brown were made and failed. Carlos (from France) remotely connected and temporarily set the tripping time limit from 1 hour to 8 hours. Which would give us enough time to address the issue. 13:00pm, Aadon replied and disabled two temperature sensors (one of them was bad and causing the issue) which might trip the interlock. Short-term-wise, the NPS chiller will no longer be able to trip HV interlock from the NPS temperature or coolant sensors.

Since run #2383, 12:55, we introduced a new trigger threshold based on Alex's suggestion (reducing the two-photon threshold from 750 to 650).

Additionally, to further improve the smoothness of the data production, the spokespersons jointly made decisions to take action to eliminate the above issues in future runnings:

  • If possible, turn off (warm-up) SHMS dipole during an accelerator maintenance day.
  • Disabling the interlock tripping features in the NPS temperature and coolant.
  • Shift crews no longer are required to fill in all details on the run sheet. For a new configuration, start a new page and carefully fill in all of the details; if the configuration stays the same, one kinematics setting, date, and initial are required;

Current Status

  • Production with the newly reduced two-photon threshold.
  • If possible run LD2 production runs (1 hour long) at 35uA

Near Future Plan

  1. We will postpone the Monday corrector coil beam steering test, to the next setting change, since the current setting doesn't require the corrector coil.
  2. Wednesday, November 2, 7:30 a.m.: sweep the hall open for maintenance first thing in the morning. We will attempt the following maintenance items:
    1. NPS students will remove all PMTs + bases from column. Hall tech support is needed for this part.
    2. NPS shielding installation if ready
    3. Heidi is looking into the possibility of warming up the SHMS dipole. If feasible, SHMS dipole will be warmed up.
    4. Chandan and Dave Mac checking/maintaining will access and check the HMS hodoscope patch panel. to address this issue: https://logbooks.jlab.org/entry/4210267
    5. Aaron will push new code for the NPS chiller controller.
  3. Tuesday, October 31, 11:00 a.m.: We will invite Vald to give an insight into the high radiation test results.

I am sure the maintenance list will grow as we get closer to Wednesday.

Special Studies

Sweeper off test results:

Planned Accesses to the Hall Today

Planned Accelerator Configuration Changes

  • Pass change in Hall A on the 31st

Special Requests

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