Author:
Cheng Wencai,Zhu Zihan,Zhao Minghua,Zhang Meng,Gu Duan
Abstract
Abstract
The microbunching instability (MBI) driven by beam collective effects can cause significant electron beam quality degradation in advanced x-ray free electron lasers. Typically, multiple stage magnetic bunch compressors used to generate high peak current electron beam will dramatically amplify the microbunching instability. In this paper, by redesigning the solenoid elaborately and adopting a dual-mode buncher cavity with the third harmonic mode used to correct the RF curvature, it is potential for the electron beam to be further compressed in velocity bunching (VB) process. Therefore, a VB plus one bunch compressor could be a promising alternative scheme to achieve moderate peak current beam for high-repetition-rate X-ray FELs to suppress the additional MBI gain due to multi-stage magnetic bunch compressors.
Reference17 articles.
1. Start-to-end simulation of self-amplified spontaneous emission free electron lasers from the gun through the undulator;Borland;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment,2002
2. Suppression of microbunching instability in the linac coherent light source;Huang;Phys. Rev. ST Accel. Beams,2004
3. Microbunching instability in single-pass systems using a direct two-dimensional Vlasov solver;Venturini;Physical Review Special Topics - Accelerators and Beams,2007
4. Modeling of the microbunching instability;Borland;Phys. Rev. ST Accel. Beams,2008
5. Control and application of beam microbunching in high brightness linac-driven free electron lasers;Huang;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment,2018