Accelerator Design Study for a Soft X-Ray Free Electron Laser at the Lawrence Berkeley National Laboratory

Abstract

CBP 835 LBNL- ???? September 1, 2009 Accelerator Design Study for a Soft X-Ray Free Electron Laser at the Lawrence Berkeley National Laboratory E. Kur, G. Penn, J. Qiang, M. Venturini, R. Wells, and A. Zholents Lawrence Berkeley National Laboratory, Berkeley CA 94720 Abstract A concept for a high brightness, high repetition rate, free electron laser light source operating in the soft x-ray spectrum is under development at LBNL. The present Report summarizes recent design studies for the accelerator part of the machine. We highlight aspects of charged particle dynamics that have the potential to affect the beam quality, discuss the main components of the beam delivery system, and present the baseline design for the accelerator utilizing superconducting technology. Particular attention is devoted to the study of the microbunching instability, which is modeled using state of the art multi-billion macroparticle simulations, assessment of multibunch instabilities, and investigation of jitter errors including an approximate model of a feedback system. The proposed design is expected to be capable of delivering beams with the required characteristics to meet the performance goals for a new light source.