Difference between revisions of "June 23, 2022"

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(Created page with "= Planned Accesses to the Hall =...")
 
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= 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 =                                                                                                                                                                                     
 +
[https://redmine.jlab.org/attachments/download/1480/10_549_GeV_Runplan.pdf pionLT Summer 2022 Run Plan]  <br>                                                                                           
 +
[https://hallcweb.jlab.org/wiki/index.php/PionLT_2022_Physics_Status 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_pro\
 +
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                           
 +
* 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 pionL\
 +
T 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/40056\
 +
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                                                                                                 
 +
** 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 =                                                                                                                                                                           
 
* During the accelerator full maintenance day (Thursday Jun 23, 2022)                                                                                                                                     
 
* During the accelerator full maintenance day (Thursday Jun 23, 2022)                                                                                                                                     

Revision as of 06:01, 23 June 2022

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_pro\

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
  • 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 pionL\ T run plan.

Current Issues

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
    • 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 [https://logboo\

ks.jlab.org/entry/4003796 HMS Dipole LCW] ( PENDING ) 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.

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 ( 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 </s\

pan>)

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