TJNAF Experiment 93027
"Measurement of the ratio of the proton's electric to magnetic form factor "
  • Status of the Experiment (updated by MKJ August 13th 17:15)
    1. Run plan for 8/14 to 8/24 (postscript)
    2. Moller WWW page
    3. Shift schedule for period of August 10th - 24th.
    4. New electronic  logbook .
    5. Summary of second run
      6. Q2 Date started Date ended Runs Triggers
      0.5  Mon Aug 24 22:41:46  Tue Aug 25 05:56:55 2818-2837 24.2M
      0.8  Fri Aug 14 23:53:14  Sun Aug 16 11:50:52 2546-2589 24.5M
      1.2  Sun Aug 16 18:30:03  Tue Aug 18 03:44:39 2594-2670 71.6M
      1.5  Wed Aug 19 08:06:09  Fri Aug 21 06:26:31 2690-2737 40.8M
      1.8  Fri Aug 21 15:00:15  Mon Aug 24 13:07:59 2740-2810 61.6
      Q2 Beam Energy Electron Angle Proton Angle E-arm x,y,z
      Offsets (mm)      		 H-arm x,y,z
      Offset (mm)      		 Link
      0.5 942.0  M=52.5,V=51.2
      th=52.592      		 M=45,V=11.5,
      h=-45.28      		 2.15,-0.07,-2.82 1.96,1.24,1.98 Table of run time etc.
      0.8 942.0  M=80,V=1.6,
      th=79.807      		  M=30.5,V=21,
      th=-30.835      		 0.60,-0.13,-3.34 2.20,1.14,1.31 Table of run time etc.
      1.2 1833.0 M=44,V=-61
      th=43.448      		 M=40,V=24.8,
      th=-40.359      		 2.28,0.14,-2.16 2.09,1.18,1.77 Table of run time etc.
      1.5 3615.0 M=22,V=54,
      th=22.113      		 M=46,V=52.5,
      th=-46.519      		 2.70,1.06,-1.10 1.93,1.08,2.03 Table of run time etc.
      1.8 3615.0 M=25,V=36,
      th=25.006      		 M=42.5,V=35,
      th=-42.917      		 3.02,0.89,-1.41 2.01,1.12,1.86 Table of run time etc.
    6. Summary of first run.
      7. Q2 Beam 
      energy      		 Electron angle Proton angle E-arm x,y,z 
      offsets (mm)      		 H-arm x,y,z 
      offset
      2.168 4102 M=24.5,V=17,
      th=24.403      		 M=40.5,V=-3,
      th=40.673      		 2.18,0.95,-0.99 -0.80,1.47,-0.69
      2.5 4102 M=27.5,V=-38.5,
      th=27.078      		 M=37.5,V=-4.5,
      th=37.681      		 2.80,0.80,-1.43 1.11,1.37,0.85
      3.0 4102 M=31.5,V=-2.0,
      th=31.288      		 M=33.5,V=-22,
      th=33.587       		 2.69,0.70,-1.63 2.04,1.04,1.36
      3.0 M=31.5,V=-1.5,
      th=31.297      		 M=33.5,V=-23,
      th=33.585      		 1.89,0.64,-1.15 2.53,0.96,1.68
      2.168 M=24.5,V=17.5,
      th=24.405      		 M=40.5,V=-3.,
      th=40.700      		 2.27,0.90,-1.03 2.26,1.11,1.25
      1.9 M=22.5,V=-3.8,
      th=22.281      		 M=43.0,V=24.8,
      th=43.360      		 2.48,1.06,-1.02 2.15,1.14,2.03
      2.168 M=24.5,V=7.5,
      th=24.346      		 M=40.0,V=83.9,
      th=40.699      		 2.46,0.85,-1.11 2.09,1.07,1.80
      3.5 M=36.0,V=17,
      th=35.900      		 M=29.5,V=26.0,
      th=29.867      		 2.29,0.60,-1.66 2.61,0.71,1.50<
      Q2 Date started Date ended Runs Triggers
      2.168 Sat May 23 08:11:06 Sun May 24 22:07:45 1130-1217
      2.5 Sun May 24 23:56:38 Sat May 30 09:36:16 1219-1440 204M
      3.0 Sat May 30 12:50:21 Tue Jun  2 00:01:11 1441-1514
      3.0 Wed Jun 10 18:38:20 Sat Jun 13 09:55:41 1529-1591 (118M total)
      2.168 Sat Jun 13 12:59:58 Mon Jun 15 07:49:21 1592-1666
      1.9 Mon Jun 15 11:46:20 Sun Jun 21 17:35:56  1670-1877 216M
      2.168 Sun Jun 21 21:16:22 Tue Jun 23 03:22:56 1879-1948  (225M total)
      3.5 Tue Jun 23 05:59:52 Wed Jul  1 16:52:58 1949-2122  70.4M
    7. Finished Q2 = 3.5 with 70.4M triggers on July 1st at about 18:30 .
    8. The electron arm's bottom VDC suffered a broken wire at about 23:30 on June 27th. After an all day effort the bottom chamber was replaced. We started to take data at about midnight on the 28th.
    9. Started Q2 = 3.5 at about 7:00 on June 23rd.  Spot change at source was started around 14:00 on June 23rd. Moller done before spot change at source was 38.2 +- .13 %. Mott done after spot change was 40.8%. Moller  done after spot changed was 37.6+- .22 %.
    10. Finished  Q2 = 2.168 with 225M total triggers on . Started taking Q2 = 2.168 data at 21:15 on June 21st.
    11. June 21th  finished Q2 = 1.9 . Have a total of 215M triggers.  Moller measurement was done June 19th in afternoon and measured 38.7% polarization.
    12. Stopped running at midnight June 15th for two maintanence days. Acquired 41M triggers at  Q2 = 1.9 which started at 11:50 at June 15th . Finished  changing to Q2 = 1.9 configuration at 10:15.
    13. Moller measured 39.2 +- 0.17 % polarization at around 11:30 June 15th.
    14. Finished Q2 = 2.168 at 9:00 June 15th with about 143M triggers. Changed to Q2 = 2.168 from 10:00 to 12:00 on June 13th.  June 13th had problems with beam and lost time. Sunday owl shift  had problems with VDC in hadron hut overheating followed by power loss in the hadron arm which led to ESR crash. Didn't get restarted until 13:00.
    15. Took  118M triggers for Q2 = 3.0  which will give 3% error on the ratio.  Started running about 18:30 on June 10th. Took data for 49 hours out of possible 63.5 (77%) and have 63.5M new triggers (about 1.3M per hour).
    16. Moller measured beam polarization of 39.5 +- 0.08 at around 18:00 on June 12th.
    17. Moller measured beam polarization of 39.2 +- 0.2 at around 18:30 on June 10th
    18. The experiment is back in running mode.  The real compton tests ended about 13:45 on June 10th.  Have setup electron and hadron arms for  Q2 = 3.0 .  Will start with a Moller run before continueing Q2 = 3.0 running.
    19. The dipole has been replaced and beam was restored to the halls around 8:30 on June 10th. Real compton resumed their test program.
    20. June 8th Mott measurement of 42.2 +- 0.5% at 11:50. Earlier QE measurement of 1.8 at 9:17 .
    21. Stop running for maintanence and facility development. Took about 56.3 triggers  for Q2 = 3.0 . Need about 120M taped triggers.  Took data 46.6 hours out of possible 59 hours (79%).  Moller was done at 22:00 and measured polarization of 39.3 +- 0.2% .
    22. The spot was moved on the wafer at around 18:00 on May 30th. A Mott measurement was done which gave 40% polarization .
    23. At 13:00 on May 30th started Q2 = 3.0 .
    24. Did Moller run  which measured a polarization of 39.4 +- 0.2 % after stopping Q2 = 2.5 running.
    25. Stop running at  Q2 = 2.5  at about 9:40 on May 30th. Took 204 million taped triggers. This amount of data should give about 3% statistical error bars on the ratio. Q2 = 2.5  was started at about 0:00 on Monday  May 25th.  Data taking was about 88 hours out the possible 129.5 hours (68% efficiency).
    26. List of beam account summaries.
    27. List of weekly summaries
  • Introductory documents about the experiment
    1. Proposal
    2. Overview and introduction to experiment 93027
    3. Homepage for JLAB FPP
    4. Paper  with results of Spring JLAB FPP 1997 commissioning.
    5. List of  JLAB FPP publications
    6. List of publications of measurements of proton's GE and GM
  • Experiment preparations
    1. During the e93-027 experiment every Monday, Wednesday and Friday a meeting at  18:00 will be held on the second floor of the counting house.
    2. The meetings of the FPP group will be on  every Thursday at 3:00pm  in room 84 in Trailer City. The main focus will be  e89033 analysis.
    3. A short listing of the run periods for e93027. For more details visit  the TJNAF experimental schedule page.
    4. Kinematics
    5. Rates estimates, expected polarization observables, and  error estimates on ratio of  GE to GM
  • Shift information
    1. Before taking shifts one must have the  *required* Jefferson Lab RADIATION/ODH/EH&S training.  Please see http://www.cebaf.gov/services/ehs/ehs.html for details.
    2. We also remind you of the *required* Hall A safety walkthrough.  Please see http://www.jlab.org/Hall-A/news/minutes/walkschd.html for details.
    3. Finally, all experiment personnel must acknowledge their familiarity with the  E93-027 Conduct of Operations (COO) (postscript) as well as their intention to  comply with all the conditions defined within by sending an email message to  Mark Jones (shift/personpower coordinator of E93-027) before performing any shiftwork.
    4. MCC operation logbook
    5. Archive of Benesch report.
    6. Shift schedule for 5/19 through 6/9,
    7. Shift schedule for period 2
    8. Shift schedule for period 3,
    9. Runsheet (postscript)
    10. Run plan for 5/21 through 6/9 (postscript )
    11. Run plan for 6/10 to 7/2 (postscript)
    12. Magnet settings for Q2 = 2.168 ,  Q2 = 2.5 GeV2 ,Q2 = 3.0 GeV2 , Q2 = 1.9 GeV2 , Q2 = 3.5 GeV2
    13. Magnet settings for Q2 = 0.5 ,  Q2 = 0.8 GeV2 ,Q2 = 1.2 GeV2 , Q2 = 1.5 GeV2 , Q2 = 1.8 GeV2
    14. Shift checklist
    15. Pre-run check-out list  ( to be done after maintanence days or long shutdowns)
    16. Target person list of responsibilities.  Cryotarget WWW page.
    17. Magnet person list of responsibilities.
    18. Data Acquisition list of responsibilities
    19. Online data analysis list of responsibilities
    20. Shift Leader list of responsibilities
  • Hardware information
    1. Helicity scheme
    2. Controlling and reading HV for VDC, scintillators and FPP chamber
    3. TDC cable mappings for FPP front chambers  , chamber 3 and chamber 4
    4. Known missing or inefficient wires in chambers 1, 2, 3, and 4.
  • Online data analysis
    1. Instructions for online data analysis
    2. Spectrometer paw kumacs
    3. Detector paw kumacs
  • Filtering data
    1. Instructions for Filtering and Data Analysis
    2. Status of filtering and data analysis for Q2 =2.168
    3. Status of filtering and data analysis for Q2 =2.5
    4. Status of filtering and data analysis for Q2 =3.0
    5. Status of filtering and data analysis for Q2 =1.9
    6. Status of filtering and data analysis for Q2 =3.5
  • Offline analysis
    1. Getting started and information on batch farms
    2. FPP variables and options in ESPACE
    3. Example ESPACE kumacs for FPP analysis
    4. Useful PAW kumacs for FPP analysis
  • Unpolarized beam commissioning  on March 29th
    1. Shift schedule
    2.  Run plan  (postscript)
    3. Summary of commissioning
    4. Replayed results for carbon scattering efficiency versus carbon thickness for different proton kinetic energies with scattering angle greater than 3 degrees, zclose between 320 and 390cm, and a cone test was passed.
    5. Logbook summary
  • Related WWW Pages
    1. Homepage for e89033
    2. Homepage for FPP
    3. Homepage for Hall A