The first experimental study is presented of a corrugated wall device that uses wakefields to remove a linear energy correlation in a relativistic electron beam (a "dechirper"). Time-resolved measurements of both longitudinal and transverse wakefields of the device are presented and compared with simulations. This study demonstrates the feasibility to employ a dechirper for precise control of the beam phase space in the next generation of free-electron-lasers.
Cylindrical asymmetry of an rf gun cavity excites the multipole rf field which will result in emittance growth of electron beams. With demanding of electron beams of ultralow emittance for the x-ray free electron laser, it is necessary to study the effect of the multipole rf field to the emittance growth and to eliminate the multipole field effect on electron beam emittance in an rf gun. In this paper, we present both theoretical analysis and numerical simulations of the multipole field effect to the emittance growth. We proposed a four-hole scheme to minimize the emittance growth from the multipole field.
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