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通过三维磁场的有限元计算,给出了自由电子激光(FEL)研究用光学速调管升级后的磁参数。国家同步辐射实验室合肥光源(HLS)电子储存环能量可以日常运行在200~800 MeV间,为了与电子储存环能量匹配,并在较高束电子能量下进行实验和得到较多的相干辐射光子,光学速调管从原来的对称结构升级成非对称结构,用于HLS储存环谐波产生 FEL实验。给出了升级后非对称光学速调管的几组匹配磁参数,用于在 HLS储存环注入能量和可以运行的最高能量下进行谐波 FEL实验。初步计算表明,HLS 储存环电子束性能优越,能散很低,FEL实验用最高能散仅为 2.05×10-4,相应 FEL辐射的能散修正因子在0.96以上,可以忽略不计。
Through the calculation of the three-dimensional magnetic field, the magnetic parameters of the free-electron laser (FEL) used in the optical klystron are given. National Synchrotron Radiation Laboratory The energy of the HLS electronic storage ring can be routinely operated at 200-800 MeV. In order to match the energy of the electron storage ring and conduct experiments at higher beam electron energies and obtain more coherent radiation photons , The optical klystron was upgraded from the original symmetrical structure to an asymmetric structure, which was used to generate FEL experiments with HLS storage ring harmonics. Several sets of matching magnetic parameters of the upgraded asymmetric optical klystron are presented for harmonic FEL experiments with the energy injected into the HLS storage ring and the maximum energy that can be operated. The preliminary calculations show that the HLS storage ring has excellent performance of electron beam and low energy dispersion. The maximum energy dispersion for FEL experiment is only 2.05 × 10-4. The energy dispersion correction factor of FEL radiation is above 0.96, which is negligible.