FEL2017 - List of Authors (Zhao, Z.T.)

Paper	Title	Page
MOC04	Status of Dalian Coherent Light Source
	W.Q. Zhang, D.X. Dai, G.L. Wang, G.R. Wu, X.M. Yang DICP, Dalian, People's Republic of China S. Chen, C. Feng, D. Wang, M. Zhang, Z.T. Zhao SINAP, Shanghai, People's Republic of China
	Funding: DCLS is a joint project of Dalian Institute of Chemical Physics (DICP) and Shanghai Institute of Applied Physics (SINAP), CAS. It is supported by National Natural Science Foundation of China (21127902) A Free Electron Laser with high brightness, ultrafast laser pulses in the vacuum ultraviolet (VUV) wavelength region is an ideal light source for excitation of valence electrons and ionization of molecular systems with very high efficiency. it is quite helpful for studies of important dynamic processes in physical, chemical and biological systems. Dalian Coherent Light Source (DCLS) plans to deliver optical beam from 50-150nm in picoseconds or 100 femtoseconds for such research. High gain harmonic generation is the perfect choice in VUV FEL for narrow bandwidth, stable power and low cost due to fewer undulators. After eight months of installation and machine commissioning, a 300-MeV electron beam was achieved with peak current of more than 300A, and the emittance was less than 1.5 mm.mrad. The FEL power for individual pulse at 133nm approached more than 200uJ with 266nm seed laser on Jan. 2017. The gain curve and spectrum of HGHG & SASE FEL was measured, and tapering undulator helps increase the power by almost 100% when the FEL output saturated. The user experiment will start on June 2017. It is open for good proposals from the whole world.
	Slides MOC04 [9.706 MB]
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MOP023	Two-Color Soft X-Ray Generation at the SXFEL User Facility Based on the EEHG Scheme	84
	Z. Qi, C. Feng, B. Liu, W.Y. Zhang, Z.T. Zhao SINAP, Shanghai, People's Republic of China
	We study the two-color soft x-ray generation at the Shanghai soft X-ray Free Electron Laser (SXFEL) user facility based on the echo-enabled harmonic generation (EEHG) scheme. Using the twin-pulse seed laser with different central wavelengths, an preliminary simulation result indicates that two-color soft x-ray FEL radiation with wavelengths at 8.890 nm and 8.917 nm can be obtained from the ultraviolet seed laser. The radiation power is about 600 MW and the time delay is adjustable.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP023
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MOP024	Simulation and Optimization for Soft X-Ray Self-Seeding at SXFEL User Facility	87
	K.Q. Zhang, C. Feng, D. Wang, Z.T. Zhao SINAP, Shanghai, People's Republic of China
	The simulation and optimization studies for the soft x-ray self-seeding experiment at SXFEL have been presented in this paper. Some critical physical problems have been intensively studied to help us obtain a more stable output and a clearer spectrum. The monochromator is optimized considering various unideal conditions such as the reflection rate, diffraction rate and the roughness of the grating and the mirrors. An integrated self-seeding simulation is also presented. The calculation and simulation results show that the properties of the self-seeding can be significantly improved by using the optimized design of the whole system and the evaluation of grating monochromator shows that the presented design is reliable for soft x-ray self-seeding experiment at SXFEL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP024
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MOP055	SCLF: An 8-GeV CW SCRF Linac-Based X-Ray FEL Facility in Shanghai	182
	Z.T. Zhao, D. Wang, L. Yin SINAP, Shanghai, People's Republic of China Z.H. Yang USTC/NSRL, Hefei, Anhui, People's Republic of China
	The Shanghai Coherent Light Facility (SCLF) is a newly proposed high repetition-rate X-ray FEL facility, based on an 8-GeV CW superconducting RF linac. It will be located at Zhangjiang High-tech Park, close to the SSRF campus in Shanghai, at the depth of ~38m underground and with a total length of 3.1 km. Using 3 phase-I undulators, the SCLF aims at generating X-rays between 0.4 and 25 keV at rates up to 1MHz. This paper describes the design concepts of this hard X-ray user facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP055
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FRA04	Three-Dimensional Manipulation of the Electron Beam Phase Space for Generating Intense Coherent Radiation in Storage Rings
	C. Feng, Z.T. Zhao SINAP, Shanghai, People's Republic of China A. Chao SLAC, Menlo Park, California, USA
	Several methods have been developed in the last decade to improve the temporal properties of a storage ring based light source. Most of these methods employ external lasers to manipulate the longitudinal phase space of the electron beam to precisely tailor the properties of the radiation pulses. In this work, we show the possibility of the realization of generating fully coherent intense EUV and x-ray radiation pulses via three-dimensional manipulation of the electron beam phase space in storage rings. Theoretical analysis and numerical simulations show that this technique can be used for the generation of megawatt-scale level, fully-temporal coherent EUV and soft x-ray radiation pulses at a storage ring light source.
	Slides FRA04 [5.725 MB]
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Paper

Title

Page

MOC04

Status of Dalian Coherent Light Source

W.Q. Zhang, D.X. Dai, G.L. Wang, G.R. Wu, X.M. Yang
DICP, Dalian, People's Republic of China
S. Chen, C. Feng, D. Wang, M. Zhang, Z.T. Zhao
SINAP, Shanghai, People's Republic of China

Funding: DCLS is a joint project of Dalian Institute of Chemical Physics (DICP) and Shanghai Institute of Applied Physics (SINAP), CAS. It is supported by National Natural Science Foundation of China (21127902)
A Free Electron Laser with high brightness, ultrafast laser pulses in the vacuum ultraviolet (VUV) wavelength region is an ideal light source for excitation of valence electrons and ionization of molecular systems with very high efficiency. it is quite helpful for studies of important dynamic processes in physical, chemical and biological systems. Dalian Coherent Light Source (DCLS) plans to deliver optical beam from 50-150nm in picoseconds or 100 femtoseconds for such research. High gain harmonic generation is the perfect choice in VUV FEL for narrow bandwidth, stable power and low cost due to fewer undulators. After eight months of installation and machine commissioning, a 300-MeV electron beam was achieved with peak current of more than 300A, and the emittance was less than 1.5 mm.mrad. The FEL power for individual pulse at 133nm approached more than 200uJ with 266nm seed laser on Jan. 2017. The gain curve and spectrum of HGHG & SASE FEL was measured, and tapering undulator helps increase the power by almost 100% when the FEL output saturated. The user experiment will start on June 2017. It is open for good proposals from the whole world.

Slides MOC04 [9.706 MB]

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MOP023

Two-Color Soft X-Ray Generation at the SXFEL User Facility Based on the EEHG Scheme

84

Z. Qi, C. Feng, B. Liu, W.Y. Zhang, Z.T. Zhao
SINAP, Shanghai, People's Republic of China

We study the two-color soft x-ray generation at the Shanghai soft X-ray Free Electron Laser (SXFEL) user facility based on the echo-enabled harmonic generation (EEHG) scheme. Using the twin-pulse seed laser with different central wavelengths, an preliminary simulation result indicates that two-color soft x-ray FEL radiation with wavelengths at 8.890 nm and 8.917 nm can be obtained from the ultraviolet seed laser. The radiation power is about 600 MW and the time delay is adjustable.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP023

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MOP024

Simulation and Optimization for Soft X-Ray Self-Seeding at SXFEL User Facility

87

K.Q. Zhang, C. Feng, D. Wang, Z.T. Zhao
SINAP, Shanghai, People's Republic of China

The simulation and optimization studies for the soft x-ray self-seeding experiment at SXFEL have been presented in this paper. Some critical physical problems have been intensively studied to help us obtain a more stable output and a clearer spectrum. The monochromator is optimized considering various unideal conditions such as the reflection rate, diffraction rate and the roughness of the grating and the mirrors. An integrated self-seeding simulation is also presented. The calculation and simulation results show that the properties of the self-seeding can be significantly improved by using the optimized design of the whole system and the evaluation of grating monochromator shows that the presented design is reliable for soft x-ray self-seeding experiment at SXFEL.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP024

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MOP055

SCLF: An 8-GeV CW SCRF Linac-Based X-Ray FEL Facility in Shanghai

182

Z.T. Zhao, D. Wang, L. Yin
SINAP, Shanghai, People's Republic of China
Z.H. Yang
USTC/NSRL, Hefei, Anhui, People's Republic of China

The Shanghai Coherent Light Facility (SCLF) is a newly proposed high repetition-rate X-ray FEL facility, based on an 8-GeV CW superconducting RF linac. It will be located at Zhangjiang High-tech Park, close to the SSRF campus in Shanghai, at the depth of ~38m underground and with a total length of 3.1 km. Using 3 phase-I undulators, the SCLF aims at generating X-rays between 0.4 and 25 keV at rates up to 1MHz. This paper describes the design concepts of this hard X-ray user facility.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP055

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FRA04

Three-Dimensional Manipulation of the Electron Beam Phase Space for Generating Intense Coherent Radiation in Storage Rings

C. Feng, Z.T. Zhao
SINAP, Shanghai, People's Republic of China
A. Chao
SLAC, Menlo Park, California, USA

Several methods have been developed in the last decade to improve the temporal properties of a storage ring based light source. Most of these methods employ external lasers to manipulate the longitudinal phase space of the electron beam to precisely tailor the properties of the radiation pulses. In this work, we show the possibility of the realization of generating fully coherent intense EUV and x-ray radiation pulses via three-dimensional manipulation of the electron beam phase space in storage rings. Theoretical analysis and numerical simulations show that this technique can be used for the generation of megawatt-scale level, fully-temporal coherent EUV and soft x-ray radiation pulses at a storage ring light source.

Slides FRA04 [5.725 MB]

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