BEAM DYNAMICS SIMULATIONS AT THE S-DALINAC FOR THE OPTIMAL POSITION OF BEAM ENERGY MONITORS∗

The Superconducting Darmstadt Linear Accelerator (S-DALINAC) is a 130 MeV superconducting recir-culating electron accelerator serving several nuclear and radiation physics experiments as well as driving an infrared free-electron laser. For the experiments an energy stability of 10−4 should be reached. Therefore noninvasive beam position monitors will be used to measure the beam energy. For the measurement the differences in flight time of the electrons to the ideal particle are compared, that means in the simulations the longitudinal dispersion of the beam transport system is used for the energy detection. The results of the simulations show that it is possible to detect an energy difference of 10−4 with this method. The results are also verified by measurements