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Settings for fpp_deut_q16

Goal                         To measure the ratio of proton's electric to magnetic form factor to 5% for Q2 = 1.6 GeV2 in deuterium

Beam Energy          1.67  GeV

Carbon Blocks        9"+6"+1.5"

Beam position          less  than  0.25 for x and y for 3A and 3B

Raster size               2.0x2.0mm in SPOT .

Beam Current          Maximum possible. Expect rate of 65 hz at 40 microA.

Target                     15cm LD₂

Spectrometer settings

Spectrometer	Momentum	Angle	Collimator
Electron	0.809 GeV	66.23°	open or 6msr
Proton	1.532 GeV	28.91°	open or 6msr

 
 
 
 
 

Data taking

• The collimator setting will be decided by doing quick runs with the open collimator and the 6msr.
  If the raw T5 rate increases by more than 20% with open collimator then use open. Otherwise use 6msr setting.
• The T5 prescale should be one.
• The prescales for T1,T2,T3 and T4 should be set to give less than 2 Hz trigger rate for each. The T8 prescale should be set to maximum.
• The trigger setup needs to be set for proton momentum.
• Need to modify the header file: hdr_fpp_89028_q16d
• The data taking time is estimated to be 22.0 hours. Will need to update after looking at carbon scattering efficiency.
• Need  1.2x10+6 total  triggers with good fpp and scattering between 5 and 20 degrees in carbon .