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Settings for fpp_deut_q10_pr160

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

                                                to 5% for Q2 = 1.0 GeV2 in deuterium at proton recoil momentum of 160 MeV/c.

Beam Energy        1.67  GeV

Carbon Blocks       3"+6"

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

Raster size             2.0x2.0mm in SPOT .

Beam Current        40 microA. or maximum possible. Expect rate of  6 hz at 40 microA.

Target                    15cm LD₂

Spectrometer settings

Spectrometer	Momentum	Angle	Collimator
Electron	1.134 GeV	42.65°	open or 6msr
Proton	1.133 GeV	33.5°	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_q10d _pr160
•  The data taking time is estimated to be 67 hours. Will need to update after looking at carbon scattering efficiency.
•   Need  3.0x10+5 total  triggers  which had scattering between 5 and 20 degrees in carbon .