High accuracy field integral measurement for TJNAF beam energy determination

The determination of the beam energy in the experimental hall A of TJNAF (previously CEBAF) accelerator is done through a very accurate measurement of the field integral of a reference dipole magnet, electrically connected in series with the bending magnets transporting the beam from the accelerator to the experimental area. A new method is used to determine the field integral; this method is described, as well as the calibrations done in the laboratory. Finally, the goal to reach an accuracy of the field integral on the order of 10/sup -5/ has been reached, as it is shown by comparing the results of the beam energy determination obtained on the accelerator with this method to results obtained by other independant methods.