Absolute energy measurement of the electron beam of TJNAF (hall A) by p(e,e'p) elastic scattering

This thesis describes the electron beam energy measurement device at TJNAF hall A (Virginia USA). The accuracy of the measurement is 10-4. Such an accuracy is needed for scattering electron experiments, in particular for the determination of cross section by transverse-longitudinal separation. The method is based on the measurements of the scattering particle angles of the reaction p(e,e'p). Angular measurements are realized by a setup of silicon micro-strips detectors with an angular accuracy of 10μrd. Theoretical aspects of the method and some techniques of electron beam energy measurement are presented. A precise uncertainty calculation allowed to determine the EP detector characteristics: thin target of polypropylene, silicon strips detectors, data acquisition, electronics and trigger. The high level of accuracy leads to the development of a new and original techniques of position measurement. The data analysis method, the beam energy calculation and the different corrections (vertex, radiative tails) are presented. The first tests of the detector are reviewed. The first measurement of TJNAF electron beam energy with the EP detector is foreseen on March 1998. (author)