Privacy and Security Notice

(gamma,p) Run Plan

(gamma,p) Run Plan
3.115 GeV gamma d

No gamma d running is planned at 3.115 GeV.

3.115 GeV gamma p

Instructions

  1. At this energy we are current limited, and DAQ rates should not exceed ~ 1 kHz. We are most interested in T3 and T5 triggers. Prescale T1, T2, and T4 triggers to ~ 100 Hz; these give us information on efficiencies.
  2. Avoid file splitting. Stop and restart runs when needed.
  3. The time estimate is based on scheduled time with 50% availability. Do not significantly shorten runs if count rate is larger than expected.
  4. For each angle / momentum setting, take a measurement on 12C solid target for ~10 minutes or minimum 10000 events in each arm while the magnets are settling. This should be done with raster off. (This is used to check spectrometer offsets, which are not now regularly measured.)
  5. Comment: Pi+ background is kinematically allowed only for thetacm > 90 deg, forward-angle data should be all protons
Task Ie  Target  Radiator  th-e  p-e  th-h  p-h  FPP  Time Counts
(uA)  (%)  deg  GeV  deg  GeV  door  h or m good event+good FPP
120ocm 75 MeV off ~10 12C out 24.18 2.340 48.070 1.2885 1.5+6+9 5 m ~10 k
" 30 dummy " " " " " " 10 -
" " 1H " " " " " " 80 m -
" " 1H 6% " " " " " 220 m -
" " dummy " " " " " " 15 m -
105ocm 50 MeV off 30 dummy 6% 31.53 2.054 39.909 1.6743 1.5+3+6+9 15 m -
" " 1H " " " " " " 220 m -
" " 1H out " " " " " 80 m -
" " dummy " " " " " " 10 m -
" ~10 12C " " " " " " 5 m -
ep elastic false asym for 2.499 GeV gamma d 30 1H out 36.125 1.9014 35.367 1.9366 1.5+3+6+9 1 h 0.7 M
90ocm 40 MeV off ~10 12C out 40.25 1.724 32.680 2.0635 1.5+3+6+9 5 m ~10 k
" 30 dummy " " " " " " 10 -
" " 1H " " " " " " 80 m -
" " 1H 6% " " " " " 220 m -
" " dummy " " " " " " 15 m -
75ocm 25 MeV off 30 dummy 6% 50.90 1.391 26.180 2.4461 1.5+3+6+9 15 m -
" " 1H " " " " " " 220 m -
" " 1H out " " " " " 80 m -
" " dummy " " " " " " 10 m -
" ~10 12C " " " " " " 5 m -
60ocm 25 MeV off ~10 12C out 64.58 1.071 20.304 2.7884 1.5+3+6+9 5 m ~10 k
" 30 dummy " " " " " " 10 -
" " 1H " " " " " " 80 m -
" " 1H 6% " " " " " 220 m -
" " dummy " " " " " " 15 m -
45.5ocm 25 MeV off 30 dummy 6% 82.01 0.7805 15.043
Be Careful! 		3.0703 1.5+3+6+9 15 m -
" 30 1H " " " " " " 220 m -
" 30 1H out " " " " " 80 m -
" " dummy " " " " " " 10 m -
" ~10 12C " " " " " " 5 m -