Difference between revisions of "Compton Meeting, June 9, 2011"

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Previous Meeting: [[Compton Meeting, June 2, 2011]]
 
Previous Meeting: [[Compton Meeting, June 2, 2011]]
  
−
Following Meeting:
+
Following Meeting: [[Compton Meeting, June 16, 2011]]
  
 
== Agenda ==
 
== Agenda ==
Line 8: Line 8:
  
 
# Updated schedule
 
# Updated schedule
−
--> laser pre-alignment change request being written: move to early August
+
#* Laser pre-alignment change request being written: move to early August
  
 
=== Analysis ===
 
=== Analysis ===
Line 25: Line 25:
  
 
(The book-keeping currently done in 'run_list' files can be automated by using the database)
 
(The book-keeping currently done in 'run_list' files can be automated by using the database)
 +
 +
 +
== Minutes ==
 +
 +
Attendance: Manos, Don, Juan Carlos, Mark, Vladas, Seth, Amrendra, Jeff, Wouter, Dave
 +
 +
* SAD schedule
 +
** moving survey & alignment to later, first/second week of August, messing with laser alignment earlier, change request in with Diane Napier after mess-up in unannounced scheduling meeting while Dave on vacation
 +
** start messing with laser on June 27
 +
*** measure transfer function
 +
*** new bellows, new cavity mirrors
 +
*** machining of gimbal mounts (might be hard, has been in beam line, check with radcon)
 +
*** put everything back before Don goes on vacation
 +
** September 19: re-fiducialization
 +
** September 30: final alignment
 +
** somehow vacuum should be pulled between these two dates (disappeared from schedule)
 +
* Laser
 +
** new cavity mirrors, transfer function measurement with new mirrors
 +
** continued work on laser polarization measurement by Seth
 +
* Photon detector
 +
** got approval for translation stage for Compton cone position measurement
 +
* Analysis
 +
** batchman scripts work now
 +
** only 1TB work disk, not enough room for electron detector (no ROOT analyzer yet)
 +
** Dave's suggestion: copy things over to cdaq cluster while replay is running
 +
** full replay to tape silo, jget subset to work disk
 +
** changes in data acquisition should not affect replay continuity
 +
** some changes in ROOT tree names, will be sent out by email
 +
* Tale of two runs
 +
** [https://qweak.jlab.org/elog/Photon+Detector/121 ELOG Photon 121]
 +
** asymmetry changed when adding cuts
 +
** fixed width histograms, large effect when opening up range
 +
** yield for background subtraction, change in average asymmetry
 +
** Don/Dave will rerun scripts on larger set of runs to get uncertainty
 +
* Electron detector
 +
** [https://qweak.jlab.org/elog/Electron+Detector/217 ELOG Electron 217]
 +
** dependence of polarization on photo-cathode QE
 +
** QE also depends on beam current, so lowest QE point could have large horizontal uncertainty
 +
** [https://hallcweb.jlab.org/polwiki/index.php/H%29_use_tracking_to_confirm_offsets_between_planes link to wiki]

Latest revision as of 10:55, 16 June 2011

Previous Meeting: Compton Meeting, June 2, 2011

Following Meeting: Compton Meeting, June 16, 2011

Agenda

Laser

  1. Updated schedule
    • Laser pre-alignment change request being written: move to early August

Analysis

  1. Replay status
    • submission scripts tested and integrated in batch manager (see [1])
    • need all offline macros self-contained in svn, only what is in svn will be used in replay. Initial import done but untested.
    • --Wdconinc 16:08, 7 June 2011 (UTC)

Photon Detector

  1. A tale of 2 runs - large backgrounds and their subtraction

Database

What information from the Compton parameters do we want to go into the database ?

(The book-keeping currently done in 'run_list' files can be automated by using the database)


Minutes

Attendance: Manos, Don, Juan Carlos, Mark, Vladas, Seth, Amrendra, Jeff, Wouter, Dave

  • SAD schedule
    • moving survey & alignment to later, first/second week of August, messing with laser alignment earlier, change request in with Diane Napier after mess-up in unannounced scheduling meeting while Dave on vacation
    • start messing with laser on June 27
      • measure transfer function
      • new bellows, new cavity mirrors
      • machining of gimbal mounts (might be hard, has been in beam line, check with radcon)
      • put everything back before Don goes on vacation
    • September 19: re-fiducialization
    • September 30: final alignment
    • somehow vacuum should be pulled between these two dates (disappeared from schedule)
  • Laser
    • new cavity mirrors, transfer function measurement with new mirrors
    • continued work on laser polarization measurement by Seth
  • Photon detector
    • got approval for translation stage for Compton cone position measurement
  • Analysis
    • batchman scripts work now
    • only 1TB work disk, not enough room for electron detector (no ROOT analyzer yet)
    • Dave's suggestion: copy things over to cdaq cluster while replay is running
    • full replay to tape silo, jget subset to work disk
    • changes in data acquisition should not affect replay continuity
    • some changes in ROOT tree names, will be sent out by email
  • Tale of two runs
    • ELOG Photon 121
    • asymmetry changed when adding cuts
    • fixed width histograms, large effect when opening up range
    • yield for background subtraction, change in average asymmetry
    • Don/Dave will rerun scripts on larger set of runs to get uncertainty
  • Electron detector
    • ELOG Electron 217
    • dependence of polarization on photo-cathode QE
    • QE also depends on beam current, so lowest QE point could have large horizontal uncertainty
    • link to wiki
Retrieved from "https://hallcweb-2024.jlab.org/polwiki/index.php?title=Compton_Meeting,_June_9,_2011&oldid=741"