This work will be performed in collaboration with DESY (Germany) and HU (Israel)
We aim to show energy-chirp compensation of electron beams in a plasma, providing the basis for efficient beam transport and ultimately to allow the utilization of plasma accelerated beams for photon source application. The main reason is that although different injection schemes have been proposed for plasma acceleration modules, they all are expected to generate a significant monotonically changing, mostly linear, energy-chirp, with the energy increasing from the head of the beam to the tail. The proposed method relies on the fact that longitudinal fields as seen by a short driving beam are decelerating and thus, can be used to compensate an initially imposed energy-chirp. This offers the possibility to cancel the energy chirp of the accelerated beam by making him drive a plasma wave. The resulting wakefields will make the tail of the drive beam lose energy, while the head is unaffected. Since the accelerated beam is very shorter, the plasma density can be adjusted at the end of the acceleration module to bring the beam to drive a wake for “self-dechirping”. To this end a dedicated design, production and test of the plasma module is required.