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Settings for fpp_1h_q04

Goal                         To measure the ratio of proton's electric to magnetic form factor to 2%

Beam Energy          1.67  GeV

Carbon Blocks        3"

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

Raster size               2.0x2.0mm in SPOT .

Beam Current          2 microA. or maximum possible with deadtime < 30%. Expect rate of 2,200 hz at 2 microA.

Target                     15cm LH₂

Spectrometer settings

Spectrometer	Momentum	Angle	Collimator
Electron	1.438 GeV	24.45°	open or 6msr
Proton	0.6946 GeV	58.97°	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 10 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_q04h
•        The data taking time is estimated to be 3.0 hours. Will need to update after looking at carbon scattering efficiency.
•        Need  2.2x10+6 total  triggers  which had scattering between 5 and 20 degrees in carbon .