Difference between revisions of "June 23, 2022"

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* 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.                             
−
** Q1 Interlock at 4:30 am.  No production data since.  Will address DAY shift
+
** Q1 Interlock at 4:30 am.  No production data since.  Will address DAY shift.  This was RESOLVED
−
** On page 33 of run plan.  New Setting: Q2=2.45, W=3.20, x=0.21, high ε data taking.  Angles are set, awaiting SHMS Q1 to set momentum
+
** SHMS Dipole is not ramping to set current.  Heidi and Steve L. have been notified RESOLVED
 +
** Request made to ramp spectrometer magnets to 0 A for Power Shed
 +
** On page 33 of run plan.  New Setting: Q2=2.45, W=3.20, x=0.21, high ε data taking.  Angles are set, awaiting SHMS Dipole troubleshooting
  
 
= Current Run Plan =                                                                                                                                                                                       
 
= Current Run Plan =                                                                                                                                                                                       
Line 14: Line 16:
 
                                                                                                                                                                                                            
 
                                                                                                                                                                                                            
 
= Notices in Effect for Shift Crew =                                                                                                                                                                       
 
= 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_pro\
+
* 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                                                                                                                                                                       
−
rated = 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                             
 
* 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, \
+
* 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.                                                                                                                                                                                               
−
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 pionL\
+
−
T run plan.                                                                                                                                                                                               
+
 
                                                                                                                                                                                                            
 
                                                                                                                                                                                                            
 
= 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:                                                                                                                     
 
** See log-entries: https://logbooks.jlab.org/entry/4005325 , https://logbooks.jlab.org/entry/4005330                                                                                                     
 
** 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/40056\
+
** 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 today during maintenance day                                                                              
−
24 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                                                                                                   
 
* 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                                        
+
** 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 (TODAY)                                                                                                                                   
 +
**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>)
  
−
= 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 [https://logboo\
 
−
ks.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 befor\
 
−
e 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 whi\
 
−
ch 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>)                 
 
−
                                                                                                                                                                                                         
 
 
= 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 today. Beam was be taken away at 6:15 am.  Best case scenario is beam restoration will begin at 15:00
−
                                                                                                                                                                                                         
+
 
 
= 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''' </s\
+
* 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>)                                                                                                                                                                                                     
−
pan>)                                                                                                                                                                                                     
+
 
** 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 10:55, 23 June 2022

Current Status

  • Accelerator status:
    • Beam went away at 6:15 am for planned maintenance day and power shed
    • Restoration should occur late DAY or Early SWING
    • Will try to push to 80 uA (current 45 uA is highest stable available current)
  • 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.
    • Q1 Interlock at 4:30 am. No production data since. Will address DAY shift. This was RESOLVED
    • SHMS Dipole is not ramping to set current. Heidi and Steve L. have been notified RESOLVED
    • Request made to ramp spectrometer magnets to 0 A for Power Shed
    • On page 33 of run plan. New Setting: Q2=2.45, W=3.20, x=0.21, high ε data taking. Angles are set, awaiting SHMS Dipole troubleshooting

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

Planned Accesses to the Hall

  • During the accelerator full maintenance day (TODAY)
    • 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 today. Beam was be taken away at 6:15 am. Best case scenario is beam restoration will begin at 15:00

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 )
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