Shanghai Soft X-Ray Free-Electron Laser Facility

Zhao Zhentang; Wang Dong; Yin Lixin; Gu Qiang; Fang Guoping; Gu Ming; Leng Yongbin; Zhou Qiaogen; Liu Bo; Tang Chuanxiang; Huang Wenhui; Liu Zhi; Jiang Huaidong; Weng Zuqian

doi:10.3788/CJL201946.0100004

Journals >Chinese Journal of Lasers >Volume 46 >Issue 1 >Page 100004 > Article

Chinese Journal of Lasers
Vol. 46, Issue 1, 100004 (2019)

Shanghai Soft X-Ray Free-Electron Laser Facility

Zhao Zhentang^1、*, Wang Dong¹, Yin Lixin¹, Gu Qiang¹, Fang Guoping¹, Gu Ming¹, Leng Yongbin¹, Zhou Qiaogen¹, Liu Bo¹, Tang Chuanxiang², Huang Wenhui², Liu Zhi³, Jiang Huaidong³, and Weng Zuqian³

Author Affiliations

¹[in Chinese]

²[in Chinese]

³[in Chinese]

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DOI: 10.3788/CJL201946.0100004 Cite this Article Set citation alerts

Zhao Zhentang, Wang Dong, Yin Lixin, Gu Qiang, Fang Guoping, Gu Ming, Leng Yongbin, Zhou Qiaogen, Liu Bo, Tang Chuanxiang, Huang Wenhui, Liu Zhi, Jiang Huaidong, Weng Zuqian. Shanghai Soft X-Ray Free-Electron Laser Facility[J]. Chinese Journal of Lasers, 2019, 46(1): 100004 Copy Citation Text

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Fig. 1. Aerial view of SSRF and SXFEL

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Fig. 2. Schematic of SXFEL layout

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Fig. 3. Simulated FEL output characteristics of SXFEL-TF. (a)(b) HGHG-HGHG cascading scheme; (c)(d) EEHG-HGHG cascading scheme; (e)(f) single EEHG scheme

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Fig. 4. Simulated FEL performance of SXFEL-UF. (a) Gain curve of seeded FEL line (3 nm) along length of undulator z; (b) output spectrum of seeded FEL line (3 nm) along length of undulator z; (c) gain curve of SASE line (2 nm); (d) output spectrum of SASE line (2 nm)

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Fig. 5. (a) Beamline layout and (b) key components of SXFEL user facility

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Fig. 6. (a) SXFEL building (SXFEL-TF and SXFEL-UF); (b) injector; (c) main accelerator; (d) FEL amplifier

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Fig. 7. Commissioning results of linear accelerator and FEL of SXFEL-TF (June 2017). (a) Beam energy; (b) transverse emittance; (c) transverse beam spot; (d) second harmonic under HGHG scheme (133 nm)

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Fig. 8. 3rd-6th harmonic spectra of first HGHG output of SXFEL. (a) 3rd harmonic; (b) 4th harmonic; (c) 5th harmonic; (d) 6th harmonic

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Fig. 9. Results of EEHG experiment at SXFEL. (a) EEHG spectrum of 11th harmonic; (b) HGHG spectrum of 11th harmonic; (c) EEHG coherent signal of 30th harmonic

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Parameter	SXFEL-TF	SXFEL-UF
Electron beam energy /GeV	0.84	1.5
Energy spread (RMS) /%	≤0.1	≤0.1
Normalized emittance (RMS)	≤2.0	≤1.5
Bunch length (full widthat half maximum, FWHM) /ps	≤1.0	≤0.7
Bunch charge /nC	0.5	0.5
Peak current /A	≥500	≥700
Repetition rate /Hz	10	50

Table 1. Main parameters of SXFEL linear accelerator

Device	Electron beamenergy /MeV	Bunchlength /mm	Energyspread /%	Gradient /(MV·m^-1)	Phase /(°)	Momentumcompression factor /mm
L0	130	0.86	0.14
L1	273	0.86	1.44	27	-29.2
X	256	0.86	1.51	19	180
BC1		0.13				-48
L2	640	0.13	0.42	38	4
BC2		0.07				-15
L3	1500	0.07	0.028	38	6

Table 2. Designed working parameters of SXFEL-UF

Parameter	SXFEL-TF	SXFEL-UF
Parameter	SXFEL-TF	Seeded FEL line	SASE FEL line
FEL operation scheme	HGHG-HGHG/EEHG-HGHG	Externally seeded FEL	SASE
Seed laser wavelength /nm	266	240-360
FEL wavelength /nm	8.8	3-20	2-10
FEL peak power /MW	≥100	≥100	≥100
FEL pulse length (FWHM) /fs	~100	~50	~100

Table 3. FEL parameters of SXFEL

Device		Parameter	Value
Stage 1 ofseeded FEL line		Period /mmLength /m	801.6
		Quantity	2
	Modulator	Type	Planar, hybrid
		Maximal peak field /T	0.78
		Minimum gap /mm	10
		Period /mmLength /m	403
		Quantity	4
	Radiator	Type	Planar, hybrid
		Maximal peak field /T	0.85
		Minimum gap /mm	10
Stage 2 ofseeded FEL line		Period /mmLength /m	551.6
		Quantity	1
	Modulator	Type	Planar, hybrid
		Maximal peak field /T	1.42
		Minimum gap /mm	10
		Period /mmLength /m	23.53
		Quantity	10
	Radiator	Type	Planar, hybrid
		Maximal peak field /T	0.65
		Minimum gap /mm	8.75
		Period /mmLength /m	303
		Quantity	2
	Afterburner	Type	Elliptical, APPLE-II
		Maximal peak field /T	0.8/0.85/0.6^*
		Minimum gap /mm	4
			Period /mmLength /m	164
		Quantity	10
SASE FEL line	Undulator	Type	Planar, hybrid, in-vacuum
		Maximal peak field /T	1.14
		Minimum gap /mm	4

Table 4. Main parameters of SXFEL undulators

Parameter	SASE FEL beamline	Seeded FEL beamline
Wavelength /nm	1.2-12	2.4-24
Photon energy /eV	100-1000	50-500
Pulse energy /μJ	330(100 eV), 47(620 eV)	64(56 eV), 5(500 eV)
Photon number per pulse	~4.6×10¹¹(620 eV),~1.3×10¹³(100 eV)	~5.0×10⁹(500 eV)~2.9×10¹²(50 eV)
Relative bandwidth /%	0.04-0.20	0.008-0.040
Resolving power of spectrometer	~3×10⁴(620 eV)	~4×10³(200 eV)
Spot size (RMS) /μm	~3	~10
FEL pulse length (FWHM) /fs	117(620 eV)	50(300 eV)

Table 5. FEL parameters of SXFEL at sample points

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