Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats

Xi-Yang Huang, Yi Jiao, Gang Xu, Xiao-Hao Cui
2015 Chinese Physics C, High Energy Physics & Nuclear Physics  
The coherent synchrotron radiation (CSR) effect in a bending path plays an important role in transverse emittance dilution in high-brightness light sources and linear colliders, where the electron beams are of short bunch length and high peak current. Suppression of the emittance growth induced by CSR is critical to preserve the beam quality and help improve the machine performance. It has been shown that the CSR effect in a double-bend achromat (DBA) can be analyzed with the two-dimensional
more » ... nt-kick analysis method. In this paper, this method is applied to analyze the CSR effect in a triple-bend achromat (TBA) with symmetric layout, which is commonly used in the optics designs of energy recovery linacs (ERLs). A condition of cancelling the CSR linear effect in such a TBA is obtained, and is verified through numerical simulations. It is demonstrated that emittance preservation can be achieved with this condition, and to a large extent, has a high tolerance to the fluctuation of the initial transverse phase space distribution of the beam.
doi:10.1088/1674-1137/39/5/057001 fatcat:wknzq2ayavehlmuvgibxmwk2am