[1] Pellegrini C, Marinelli A, Reiche S. The physics of X-ray free-electron lasers[J]. Reviews of Modern Physics, 88, 015006(2016).
[2] Yu L H. Generation of intense UV radiation by subharmonically seeded single-pass free-electron lasers[J]. Physical Review A, 44, 5178-5193(1991). http://www.ncbi.nlm.nih.gov/pubmed/9906572
[3] Wu J H, Yu L H. Coherent hard X-ray production by cascading stages of High Gain Harmonic Generation[J]. Nuclear Instruments and Methods in Physics Research Section A, 475, 104-111(2001). http://www.sciencedirect.com/science/article/pii/s0168900201015522
[4] Stupakov G. Using the beam-echo effect for generation of short-wavelength radiation[J]. Physical Review Letters, 102, 074801(2009). http://europepmc.org/abstract/MED/19257677
[5] Xiang D, Stupakov G. Echo-enabled harmonic generation free electron laser[J]. Physical Review Special Topics - Accelerators and Beams, 12, 030702(2009). http://journals.aps.org/prab/abstract/10.1103/PhysRevSTAB.12.030702
[6] Yu L H, Babzien M, Ben-Zvi I et al. High-gain harmonic-generation free-electron laser[J]. Science, 289, 932-935(2000).
[7] Zhao Z T, Wang D, Chen J H et al. First lasing of an echo-enabled harmonic generation free-electron laser[J]. Nature Photonics, 6, 360-363(2012). http://www.nature.com/nphoton/journal/v6/n6/full/nphoton.2012.105.html
[8] Allaria E. Impact of radiator length in the emitted power for a high gain harmonic generation free-electron laser[J]. Physical Review Special Topics - Accelerators and Beams, 16, 030703(2013).
[9] Allaria E, Appio R, Badano L et al. Highly coherent and stable pulses from the FERMI seeded free-electron laser in the extreme ultraviolet[J]. Nature Photonics, 6, 699-704(2012). http://www.nature.com/articles/nphoton.2012.233
[10] Allaria E, Castronovo D, Cinquegrana P et al. Two-stage seeded soft-X-ray free-electron laser[J]. Nature Photonics, 7, 913-918(2013).
[11] Feng C, Deng H X. Review of fully coherent free-electron lasers[J]. Nuclear Science and Techniques, 29, 160(2018).
[12] Ackermann W, Asova G, Ayvazyan V et al. Operation of a free-electron laser from the extreme ultraviolet to the water window[J]. Nature Photonics, 1, 336-342(2007).
[13] Emma P, Akre R, Arthur J et al. First lasing and operation of an ångstrom-wavelength free-electron laser[J]. Nature Photonics, 4, 641-647(2010). http://www.nature.com/nphoton/journal/v4/n9/abs/nphoton.2010.176.html
[14] Ishikawa T, Aoyagi H, Asaka T et al. A compact X-ray free-electron laser emitting in the sub-ångström region[J]. Nature Photonics, 6, 540-544(2012). http://www.nature.com/nphoton/journal/v6/n8/full/nphoton.2012.141.html
[15] Kang H S, Min C K, Heo H et al. Hard X-ray free-electron laser with femtosecond-scale timing jitter[J]. Nature Photonics, 11, 708-713(2017). http://www.nature.com/articles/s41566-017-0029-8
[16] Decking W, Abeghyan S, Abramian P et al. A MHz-repetition-rate hard X-ray free-electron laser driven by a superconducting linear accelerator[J]. Nature Photonics, 14, 391-397(2020). http://www.nature.com/articles/s41566-020-0607-z
[17] Prat E, Abela R, Aiba M et al. A compact and cost-effective hard X-ray free-electron laser driven by a high-brightness and low-energy electron beam[J]. Nature Photonics, 14, 748-754(2020). http://www.nature.com/articles/s41566-020-00712-8
[18] Jiang M H, Yang X, Xu H J et al. Shanghai synchrotron radiation facility[J]. Chinese Science Bulletin, 54, 4171-4181(2009).
[19] Fang W C, Gu Q, Tong D C et al. Design optimization of a C-band traveling-wave accelerating structure for a compact X-ray Free Electron Laser facility[J]. Chinese Science Bulletin, 56, 3420-3425(2011).
[20] Fang W C, Gu Q, Sheng X et al. Design, fabrication and first beam tests of the C-band RF acceleration unit at SINAP[J]. Nuclear Instruments and Methods in Physics Research Section A, 823, 91-97(2016).
[21] Huang Z, Borland M, Emma P et al. Suppression of microbunching instability in the linac coherent light source[J]. Physical Review Special Topics - Accelerators and Beams, 7, 074401(2004).
[22] Raubenheimer T O, Ruth R D. A dispersion-free trajectory correction technique for linear colliders[J]. Nuclear Instruments and Methods in Physics Research Section A, 302, 191-208(1991).
[23] Emma P, Carr R, Nuhn H D. Beam-based alignment for the LCLS FEL undulator[J]. Nuclear Instruments and Methods in Physics Research Section A, 429, 407-413(1999). http://www.sciencedirect.com/science/article/pii/S0168900299001175
[24] Ding Y, Behrens C, Emma P et al. Femtosecond X-ray pulse temporal characterization in free-electron lasers using a transverse deflector[J]. Physical Review Special Topics - Accelerators and Beams, 14, 120701(2011).
[25] Behrens C, Decker F J, Ding Y et al. Few-femtosecond time-resolved measurements of X-ray free-electron lasers[J]. Nature Communications, 5, 3762(2014). http://europepmc.org/abstract/med/24781868