@article{oai:repo.qst.go.jp:00049009,
 author = {コーガ, ジェームズ and ブラノフ, セルゲイ and エシロケポフ, ティムル and 神門, 正城 and コーガ ジェームズ and ブラノフ セルゲイ and エシロケポフ ティムル and 神門 正城},
 journal = {Proceedings of the 15th International Conference on X-Ray Lasers},
 month = {Mar},
 note = {We describe a method to obtain sufficiently low energy spread laser wakefield accelerated electron beams for injection into a conventional undulator and free electron lasing. By using two laser pulses: a moderate power laser to inject and accelerate electrons via its wakefield to moderate energies and a second more powerful laser pulse to generate another wakefield further accelerating them to 1 GeV, and properly matching the acceleration stages an energy spread of 0.2% is possible, leading to the realization of a compact X-ray free electron laser.},
 pages = {117--120},
 title = {Achieving Laser Wakefield Accelerated Electron Beams of Low Enough Energy Spread for an X-FEL},
 volume = {202},
 year = {2018}
}