[1] Hettel R. DLSR design and plans: an international overview[J]. Journal of Synchrotron Radiation, 21, 843-855(2014).
[2] Tavares P F, Leemann S C, Sjöström M, et al. The MAX IV storage ring project[J]. Journal of Synchrotron Radiation, 21, 862-877(2014).
[3] Jiao Yi, Xu Gang, Cui Xiaohao, et al. The HEPS project[J]. Journal of Synchrotron Radiation, 25, 1611-1618(2018).
[4] Öström H, Öberg H, Xin H, et al. Probing the transition state region in catalytic CO oxidation on Ru[J]. Science, 347, 978-982(2015).
[5] Fukuzawa H, Son S K, Motomura K, et al. Deep inner-shell multiphoton ionization by intense X-ray free-electron laser pulses[J]. Physical Review Letters, 110, 173005(2013).
[6] Chapman H N, Barty A, Bogan M J, et al. Femtosecond diffractive imaging with a soft-X-ray free-electron laser[J]. Nature Physics, 2, 839-843(2006).
[7] Lünnemann S, Kuleff A I, Cederbaum L S. Charge migration following ionization in systems with chromophore-donor and amine-acceptor sites[J]. The Journal of Chemical Physics, 129, 104305(2008).
[8] Goulielmakis E, Loh Z H, Wirth A, et al. Real-time observation of valence electron motion[J]. Nature, 466, 739-743(2010).
[9] Li X F, L’Huillier A, Ferray M, et al. Multiple-harmonic generation in rare gases at high laser intensity[J]. Physical Review A, 39, 5751-5761(1989).
[10] Gaumnitz T, Jain A, Pertot Y, et al. Streaking of 43-attosecond soft-X-ray pulses generated by a passively CEP-stable mid-infrared driver[J]. Optics Express, 25, 27506-27518(2017).
[11] Li Jie, Ren Xiaoming, Yin Yanchun, et al. 53-attosecond X-ray pulses reach the carbon K-edge[J]. Nature Communications, 8, 186(2017).
[12] Sansone G, Poletto L, Nisoli M. High-energy attosecond light sources[J]. Nature Photonics, 5, 655-663(2011).
[13] Popmintchev T, Chen Mingchang, Popmintchev D, et al. Bright coherent ultrahigh harmonics in the keV X-ray regime from mid-infrared femtosecond lasers[J]. Science, 336, 1287-1291(2012).
[14] Kim K J, Huang Zhirong, Lindberg R. Synchrotron radiation freeelectron lasers: principles of coherent Xray generation[M]. Huang Senlin, Liu Kexin, trans. Beijing: Peking University Press, 2018
[15] 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).
[16] 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).
[17] 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).
[18] 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).
[19] Allaria E, Castronovo D, Cinquegrana P, et al. Two-stage seeded soft-X-ray free-electron laser[J]. Nature Photonics, 7, 913-918(2013).
[20] 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).
[21] 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).
[22] 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).
[23] Zhao Zhentang, Wang Dong, Gu Qiang, et al. SXFEL: a soft X-ray free electron laser in China[J]. Synchrotron Radiation News, 30, 29-33(2017).
[24] Galayda J N. The linac coherent light sourceII project[C]Proceedings of the 5th International Particle Accelerat Conference (IPAC 2014). 2014: 935937.
[25] Zhao Zhentang, Wang Dong, Yang Ziyan, et al. SCLF: an 8GeV CW SCRF linacbased Xray FEL facility in Shanghai[C]Proceedings of the 38th International Free Electron Laser Conference (FEL 2017). 2017: 182184.
[26] Bonifacio R, De Salvo L, Pierini P, et al. Spectrum, temporal structure, and fluctuations in a high-gain free-electron laser starting from noise[J]. Physical Review Letters, 73, 70-73(1994).
[27] Coffee R N, Cryan J P, Duris J, et al. Development of ultrafast capabilities for X-ray free-electron lasers at the linac coherent light source[J]. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 377, 20180386(2019).
[28] Saldin E L, Schneidmiller E A, Yurkov M V. Terawatt-scale sub-10-fs laser technology – key to generation of GW-level attosecond pulses in X-ray free electron laser[J]. Optics Communications, 237, 153-164(2004).
[29] Zholents A A, Fawley W M. Proposal for intense attosecond radiation from an X-ray free-electron laser[J]. Physical Review Letters, 92, 224801(2004).
[30] Saldin E L, Schneidmiller E A, Yurkov M V. A new technique to generate 100 GW-level attosecond X-ray pulses from the X-ray SASE FELs[J]. Optics Communications, 239, 161-172(2004).
[31] Saldin E L, Schneidmiller E A, Yurkov M V. Self-amplified spontaneous emission FEL with energy-chirped electron beam and its application for generation of attosecond X-ray pulses[J]. Physical Review Accelerators and Beams, 9, 050702(2006).
[32] Fawley W M. Production of ultrashort FEL XUV pulses via a reverse undulator taper[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 593, 111-115(2008).
[33] Duris J, Zhang Z, MacArthur J, et al. Superradiant amplification in a chirped-tapered X-ray free-electron laser[J]. Physical Review Accelerators and Beams, 23, 020702(2020).
[34] MacArthur J P, Duris J, Zhang Zhen, et al. Phase-stable self-modulation of an electron beam in a magnetic wiggler[J]. Physical Review Letters, 123, 214801(2019).
[35] Bonifacio R, McNeil B W J, Pierini P. Superradiance in the high-gain free-electron laser[J]. Physical Review A, 40, 4467-4475(1989).
[36] Bonifacio R, Piovella N, McNeil B W J. Superradiant evolution of radiation pulses in a free-electron laser[J]. Physical Review A, 44, R3441-R3444(1991).
[37] Lutman A A, Coffee R, Ding Yuantao, et al. Experimental demonstration of femtosecond two-color X-ray free-electron lasers[J]. Physical Review Letters, 110, 134801(2013).
[38] Hara T, Inubushi Y, Katayama T, et al. Two-colour hard X-ray free-electron laser with wide tunability[J]. Nature Communications, 4, 2919(2013).
[39] Lutman A A, Maxwell T J, MacArthur J P, et al. Fresh-slice multicolour X-ray free-electron lasers[J]. Nature Photonics, 10, 745-750(2016).
[40] Zhang Zhen, Duris J, MacArthur J P, et al. Double chirp-taper X-ray free-electron laser for attosecond pump-probe experiments[J]. Physical Review Accelerators and Beams, 22, 050701(2019).
[41] Zholents A A. Method of an enhanced self-amplified spontaneous emission for X-ray free electron lasers[J]. Physical Review Accelerators and Beams, 8, 040701(2005).
[42] Zholents A A, Penn G. Obtaining attosecond X-ray pulses using a self-amplified spontaneous emission free electron laser[J]. Physical Review Accelerators and Beams, 8, 050704(2005).
[43] Ding Yuantao, Huang Zhirong, Ratner D, et al. Generation of attosecond X-ray pulses with a multicycle two-color enhanced self-amplified spontaneous emission scheme[J]. Physical Review Accelerators and Beams, 12, 060703(2009).
[44] Kumar S, Kang H S, Kim D E. Generation of isolated single attosecond hard X-ray pulse in enhanced self-amplified spontaneous emission scheme[J]. Optics Express, 19, 7537-7545(2011).
[45] Kumar S, Kang H S, Kim D E. For the generation of an intense isolated pulse in hard X-ray region using X-ray free electron laser[J]. Laser and Particle Beams, 30, 397-406(2012).
[46] Qi Zheng, Feng Chao, Deng Haixiao, et al. Generating attosecond X-ray pulses through an angular dispersion enhanced self-amplified spontaneous emission free electron laser[J]. Physical Review Accelerators and Beams, 21, 120703(2018).
[47] Duris J, Li Siqi, Driver T, et al. Tunable isolated attosecond X-ray pulses with gigawatt peak power from a free-electron laser[J]. Nature Photonics, 14, 30-36(2020).
[48] Li Siqi, Guo Zhaoheng, Coffee R N, et al. Characterizing isolated attosecond pulses with angular streaking[J]. Optics Express, 26, 4531-4547(2018).
[49] Hartmann N, Hartmann G, Heider R, et al. Attosecond time–energy structure of X-ray free-electron laser pulses[J]. Nature Photonics, 12, 215-220(2018).
[50] Zhang Zhen, Duris J, MacArthur J P, et al. Experimental demonstration of enhanced self-amplified spontaneous emission by photocathode temporal shaping and self-compression in a magnetic wiggler[J]. New Journal of Physics, 22, 083030(2020).
[51] Duris J P, MacArthur J P, Glownia J M, et al. Controllable X-ray pulse trains from enhanced self-amplified spontaneous emission[J]. Physical Review Letters, 126, 104802(2021).
[52] Emma P, Bane K, Cornacchia M, et al. Femtosecond and subfemtosecond X-ray pulses from a self-amplified spontaneous-emission-based free-electron laser[J]. Physical Review Letters, 92, 0748011(2004).
[53] Serkez S, Decker F J, Cho M H, et al. Generating trains of attosecond pulses with a freeelectron laser[C]Proceedings of FEL 2019. 2019: 692694.
[54] Ding Yuantao, 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).
[55] Ding Yuantao, Behrens C, Coffee R, et al. Generating femtosecond X-ray pulses using an emittance-spoiling foil in free-electron lasers[J]. Applied Physics Letters, 107, 191104(2015).
[56] Marinelli A, Macarthur J, Emma P, et al. Experimental demonstration of a single-spike hard-X-ray free-electron laser starting from noise[J]. Applied Physics Letters, 111, 151101(2017).
[57] Huang Zhirong, Borland M, Emma P, et al. Suppression of microbunching instability in the linac coherent light source[J]. Physical Review Accelerators and Beams, 7, 074401(2004).
[58] Huang Zhirong, Brachmann A, Decker F J, et al. Measurements of the linac coherent light source laser heater and its impact on the X-ray free-electron laser performance[J]. Physical Review Special Topics. Accelerators and Beams, 13, 020703(2010).
[59] Marinelli A, Coffee R, Vetter S, et al. Optical shaping of X-ray free-electron lasers[J]. Physical Review Letters, 116, 254801(2016).
[60] Emma P, Huang Zhirong. Femtosecond X-ray pulses from a spatially chirped electron bunch in a SASE FEL[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 528, 458-462(2004).
[61] Zholents A A, Zolotorev M S. Attosecond X-ray pulses produced by ultra short transverse slicing via laser electron beam interaction[J]. New Journal of Physics, 10, 025005(2008).
[62] Bane K L F, Stupakov G. Corrugated pipe as a beam dechirper[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 690, 106-110(2012).
[63] Antipov S, Baturin S, Jing C, et al. Experimental demonstration of energy-chirp compensation by a tunable dielectric-based structure[J]. Physical Review Letters, 112, 114801(2014).
[64] Deng Haixiao, Zhang Meng, Feng Chao, et al. Experimental demonstration of longitudinal beam phase-space linearizer in a free-electron laser facility by corrugated structures[J]. Physical Review Letters, 113, 254802(2014).
[65] Emma P, Venturini M, Bane K L F, et al. Experimental demonstration of energy-chirp control in relativistic electron bunches using a corrugated pipe[J]. Physical Review Letters, 112, 034801(2014).
[66] Zhang Zhen, Bane K, Ding Yuantao, et al. Electron beam energy chirp control with a rectangular corrugated structure at the Linac Coherent Light Source[J]. Physical Review Accelerators and Beams, 18, 010702(2015).
[67] Zemella J, Bane K, Fisher A, et al. Measurements of wake-induced electron beam deflection in a dechirper at the Linac Coherent Light Source[J]. Physical Review Accelerators and Beams, 20, 104403(2017).
[68] Lutman A A, Guetg M W, Maxwell T J, et al. High-power femtosecond soft X rays from fresh-slice multistage free-electron lasers[J]. Physical Review Letters, 120, 264801(2018).
[69] Prat E, Aiba M. General and efficient dispersion-based measurement of beam slice parameters[J]. Physical Review Accelerators and Beams, 17, 032801(2014).
[70] Prat E, Bettoni S, Reiche S. Enhanced X-ray free-electron-laser performance from tilted electron beams[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 865, 1-8(2017).
[71] Guetg M W, Lutman A A, Ding Yuantao, et al. Dispersion-based fresh-slice scheme for free-electron lasers[J]. Physical Review Letters, 120, 264802(2018).
[72] Reiche S, Musumeci P, Pellegrini C, et al. Development of ultra-short pulse, single coherent spike for SASE X-ray FELs[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 593, 45-48(2008).
[73] Ding Yuantao, Brachmann A, Decker F J, et al. Measurements and simulations of ultralow emittance and ultrashort electron beams in the linac coherent light source[J]. Physical Review Letters, 102, 254801(2009).
[74] Behrens C, Decker F J, Ding Yuantao, et al. Few-femtosecond time-resolved measurements of X-ray free-electron lasers[J]. Nature Communications, 5, 3762(2014).
[75] Beutner B, Reiche S, Scherrer P. Operation modes longitudinal layout f the SwissFEL hard Xray facility[C]Proceedings of FEL 2011. 2011: 235238.
[76] Marchetti B, Krasilnikov M, Stephan F, et al. Compression of a 20 pC e-bunch at the European XFEL for single spike operation[J]. Physics Procedia, 52, 80-89(2014).
[77] Huang Senlin, Ding Yuantao, Huang Zhirong, et al. Generation of stable subfemtosecond hard X-ray pulses with optimized nonlinear bunch compression[J]. Physical Review Accelerators and Beams, 17, 120703(2014).
[78] Huang Senlin, Ding Yuantao, Feng Yiping, et al. Generating single-spike hard X-ray pulses with nonlinear bunch compression in free-electron lasers[J]. Physical Review Letters, 119, 154801(2017).
[79] Malyzhenkov A, Arbelo Y P, Craievich P, et al. Single- and two-color attosecond hard X-ray free-electron laser pulses with nonlinear compression[J]. Physical Review Research, 2, 042018(2020).
[80] Thompson N R, McNeil B W J. Mode locking in a free-electron laser amplifier[J]. Physical Review Letters, 100, 203901(2008).
[81] Dunning D J, McNeil B W J, Thompson N R. Few-cycle pulse generation in an X-ray free-electron laser[J]. Physical Review Letters, 110, 104801(2013).
[82] Prat E, Reiche S. Simple method to generate terawatt-attosecond X-ray free-electron-laser pulses[J]. Physical Review Letters, 114, 244801(2015).
[83] Prat E, Löhl F, Reiche S. Efficient generation of short and high-power X-ray free-electron-laser pulses based on superradiance with a transversely tilted beam[J]. Physical Review Accelerators and Beams, 18, 100701(2015).
[84] Tanaka T. Proposal for a pulse-compression scheme in X-ray free-electron lasers to generate a multiterawatt, attosecond X-ray pulse[J]. Physical Review Letters, 110, 084801(2013).
[85] Kumar S, Parc Y W, Landsman A S, et al. Temporally-coherent terawatt attosecond XFEL synchronized with a few cycle laser[J]. Scientific Reports, 6, 37700(2016).
[86] Wang Zhen, Feng Chao, Zhao Zhentang. Generating isolated terawatt-attosecond X-ray pulses via a chirped-laser-enhanced high-gain free-electron laser[J]. Physical Review Accelerators and Beams, 20, 040701(2017).
[87] Huang Senlin, Ding Yuantao, Huang Zhirong, et al. Generation of subterawatt-attosecond pulses in a soft X-ray free-electron laser[J]. Physical Review Accelerators and Beams, 19, 080702(2016).
[88] Tanaka T. Proposal to generate an isolated monocycle X-ray pulse by counteracting the slippage effect in free-electron lasers[J]. Physical Review Letters, 114, 044801(2015).
[89] Schulz S, Grguraš I, Behrens C, et al. Femtosecond all-optical synchronization of an X-ray free-electron laser[J]. Nature Communications, 6, 5938(2015).
[90] Hemsing E, Knyazik A, Dunning M, et al. Coherent optical vortices from relativistic electron beams[J]. Nature Physics, 9, 549-553(2013).
[91] Ribič P R, Rösner B, Gauthier D, et al. Extreme-ultraviolet vortices from a free-electron laser[J]. Physical Review X, 7, 031036(2017).
[92] Hemsing E. Coherent photons with angular momentum in a helical afterburner[J]. Physical Review Accelerators and Beams, 23, 020703(2020).
[93] Tibai Z, Tóth G, Mechler M I, et al. Proposal for carrier-envelope-phase stable single-cycle attosecond pulse generation in the extreme-ultraviolet range[J]. Physical Review Letters, 113, 104801(2014).
[94] Peng Liangyou, Starace A F. Attosecond pulse carrier-envelope phase effects on ionized electron momentum and energy distributions[J]. Physical Review A, 76, 043401(2007).