|Arc-Energy Method||EP Method||Hall A Homepage|
Experiments conducted in Hall A at Jefferson Lab. in Newport News, VA, require absoulte beam energy knowledge specified at one part in 10-4. Two methods have been implemented to determine the beam energy: the Arc-energy method and the EP method. The Arc-Energy method, developed by the Frech collaboration of Pascal Bernin and the Saclay group, measures the energy as a function of the bend angle of the arc and the field integral of eight-diplole magnets located in the forty-meter arc between the accelerator and the Hall A end station. The EP method, developed by the Clermont Ferrand group, determines the energy based on the emission angles of particles in an electron-proton elastic reaction.