Settings for fpp_scat_7
Measure the carbon scattering efficiency for Tp = 1.599 for carbon thickness of 30.5 cm (3''+9'' doors), 41.9 cm (1 1/2''+6''+9''), and 49.5cm ( all doors).
Beam Energy
4.045 GeV
Beam position
< .25 for x and y for 3A and 3B
Raster size
1.5x1.5mm
Beam Current
» 50mA.
Target
15cm LH2
Spectrometer settings
Spectrometer  Momentum  Angle  Collimator 
Electron  2.446 GeV  31.96°  6msr 
Proton  2.357 GeV  33.32°  6msr
 
Magnet settings
Spectrometer  Dipole  Q1  Q2  Q3 
Electron  0.962814 T  1830.37 A  1047.61 A  968.597 A 
Proton  0.869897 T  1762.67 A  1008.86 A  932.769 A
 

The electron quads are all set to negative polarity. The hadron Q1 and Q3 are set to positive polarity, but Q2 is set to negative polarity. For a first guess at current for electron dipole either scale from earlier run or use 909 A/T. Suggest that the electron dipole be set to 10-3 level and then quads scaled to match.

Data taking
The T5 prescale should be one. The prescales for T1,T2,T3 and T4 should be set to give less than 5 Hz trigger rate for each. The T8 prescale should be set to maximum.

The trigger setup should be proton_1700-4000.settings .

For each carbon thickness run for 15 minutes. Have allowed 15 minutes for carbon door changes.