Analysis of the microbunching instability in a mid-energy electron linac
Abstract
Microbunching instability usually exists in the linear accelerator (linac) of a free electron laser (FEL) facility. If it is not controlled effectively, the beam quality will be damaged seriously and the machine will not operate properly. In the electron linac of a soft X-Ray FEL device, because the electron energy is not very high, the problem can become even more serious. As a typical example, the microbunching instability in the linac of the proposed Shanghai Soft X-ray Free Electron Laser facility (SXFEL) is investigated in detail by means of both analytical formulae and simulation tools. In the study, a new mechanism of introducing random noise into the beam current profile as the beam passes through a chicane-type bunch compressor is proposed. The higher-order modes that appear in the simulations suggest that further improvement of the current theoretical model of the instability is needed.
Cite
@article{arxiv.1406.6427,
title = {Analysis of the microbunching instability in a mid-energy electron linac},
author = {Dazhang Huang and Qiang Gu and Zhen Wang and Meng Zhang and King Yuen Ng},
journal= {arXiv preprint arXiv:1406.6427},
year = {2015}
}
Comments
7 pages, 15 figures. arXiv admin note: substantial text overlap with arXiv:1304.7437