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Jefferson Lab Experiment E91-016

H2(e,e'p) elastic SOS scan

Item Task Log Entry
  Keep the SOS momentum at +1.290 GeV/c
 

            HMS 
    Th         P        Q2    Prec     ThSOS
  18.00 2.775 0.882  1.050   54.77  -19%
  19.00 2.731 0.965  1.109   53.27  -14%
  20.00 2.685 1.051  1.168   51.83  -10%
  21.00 2.639 1.138  1.227   50.43  -  5%
  22.00 2.592 1.225  1.285   49.09
  23.00 2.545 1.313  1.343   47.79  +4%
  24.00 2.498 1.402  1.400   46.54  +9%
  25.00 2.451 1.490  1.456   45.33   +13%
  26.00 2.404 1.579  1.512   44.17  +17%
  27.00 2.357 1.667  1.567   43.05   +21%

( "%" is approximate)
 

  • HMS current&field settings: 

  • run  ~cdaq/FIELD/field99 to obtain HMS settings

    Set HMS Quads 200 A above required setting and then go down to nominal setting

  • Degauss SOS for protons and then go up to nominal setting
  ~ 30 uA should be possible.  
  Adjust prescale factors to get high statistics singles for HMS and SOS with reasonable deadtime.  
Get ~100K coincidences  
Take also
  • with sieve slit in HMS.(~100K)
  • dummy
  • Hall C Operating Manual
    Last updated 11/19/99
    By Jörg Reinhold(reinhold@fiu.edu)