General Design of Infrared Terahertz Free‑Electron Laser Facility of Chinese Academy of Engineering Physics

Kui Zhou; Peng Li; Hanxun Xu; Dexin Xiao; Jianxin Wang; Xing Luo; Xuming Shen; Tianhui He; Lijun Chen; Longgang Yan; Weijun Wang; Yong Xu; Yu Liu; Shuai Ma; Ziru Sang; Xingfan Yang; Dai Wu; Ming. Li

doi:10.3788/CJL230786

Chinese Journal of Lasers, Volume. 50, Issue 17, 1718001(2023)

General Design of Infrared Terahertz Free‑Electron Laser Facility of Chinese Academy of Engineering Physics

Kui Zhou^*, Peng Li, Hanxun Xu, Dexin Xiao, Jianxin Wang, Xing Luo, Xuming Shen, Tianhui He, Lijun Chen, Longgang Yan, Weijun Wang, Yong Xu, Yu Liu, Shuai Ma, Ziru Sang, Xingfan Yang, Dai Wu, and Ming. Li

Author Affiliations

Institute of Applied Electronics, Chinese Academy of Engineering Physics, Mianyang 621900, Sichuan, China

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Figures & Tables(12)

Fig. 1. Schematic diagram of CAEP IR THz FEL facility

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Fig. 2. FEL radiation frequency versus undulator gap and beam energy. (a) U48 undulator; (b) U35 undulator

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Fig. 3. Schematic diagram of CTFEL facility

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Fig. 4. Schematic diagram of the 2×9-cell superconducting cavity module

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Fig. 5. Layout of the facility and its working modes. (a) Layout; (b) FEL mode; (c) FLASH mode; (d) ERL mode

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Fig. 6. Layout of user experimental stations

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Table 1. Comparison of the main parameters between CAEP IR THz FEL facility and CTFEL

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Table 1. Comparison of the main parameters between CAEP IR THz FEL facility and CTFEL

Parameter	Value
Parameter	CTFEL	CAEP IR THz FEL
Frequency tuning range /THz	0.1‒4.2	0.1‒125
Maximum macro pulse power /W	>10	>100
Maximum beam energy /MeV	8	50
Beam current /mA	5	2.5
Micro pulse repetition rate /MHz	54.17	27.08

Table 2. Main design parameters of the 2×9-cell superconducting acceleration module

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Table 2. Main design parameters of the 2×9-cell superconducting acceleration module

Parameter	Designed value
Working frequency /GHz	1.3
Effective field gradient /（MV·m^-1）	≥15
Working mode	Pulse & continuous wave（CW）
Beam current intensity /mA	1‒3
Working temperature /K	2
Tuning range /kHz	-200 to +200
Magnetic shielding field /mGs	≤20
2 K static thermal load /W	≤20

Table 3. Main design parameters of the undulators
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Table 3. Main design parameters of the undulators
Undulator Period length /mm Period number Minimum gap /mm
U48 48 40 20
U35 35 54 12

Table 4. Main design parameters of the optical cavity system

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Table 4. Main design parameters of the optical cavity system

Optical cavity	Optical cavity length /m	Waveguide	Mirror type	Mirror curvature /m	Mirror hole diameter /mm	Mirror diameter /mm
Optical cavity for U48	5.538	With	Upstream mirror	3.2		80
			Downstream mirror 1	3.2	1.8	50
			Downstream mirror 2	3.2	2.4	70
			Downstream mirror 3	3.2	4.0	80
Optical cavity for U35	5.538	Without	Upstream mirror 1	3.0	0.8	40（adjustable diaphragm）
			Upstream mirror 2	3.0	1.2	40（adjustable diaphragm）
			Upstream mirror 3	3.0	1.8	40（adjustable diaphragm）
			Downstream mirror	3.0		40（adjustable diaphragm）

Table 5. Main parameters of the facility in FEL mode

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Table 5. Main parameters of the facility in FEL mode

Class	Main parameter	Value
Class	Main parameter	U58	U38	U48	U35
Output FEL	Frequency tuning range /THz	0.1‒0.7	0.7‒4.2	2‒20	15‒125
	Maximum macro pulse power /W	~1	>10	>40	>100
	Micro pulse power /MW	>10	>0.5	>0.5	>2
	Spectrum bandwidth	20%‒30%	1%‒3%	1%‒3%	1%‒3%
	Micro pulse length /ps	0.1‒0.5	1‒5	1‒10	2‒3
Electron beam	Electron energy /MeV	4‒5	6‒8	10‒25	25‒50
	Beam current intensity /mA	5	5	2.5	2.5
	Micro pulse repetition rate /MHz	54.17	54.17	27.08	27.08
	Macro pulse repetition rate /Hz	1，5，10，20
	Duty cycle	≤10%

Table 6. Main parameters of the facility in ERL mode
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Table 6. Main parameters of the facility in ERL mode
Parameter Designed value
Injector energy /MeV 6‒8
Beam energy /MeV 20
Beam current /mA 1‒3
Energy recovery efficiency >95%

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Kui Zhou, Peng Li, Hanxun Xu, Dexin Xiao, Jianxin Wang, Xing Luo, Xuming Shen, Tianhui He, Lijun Chen, Longgang Yan, Weijun Wang, Yong Xu, Yu Liu, Shuai Ma, Ziru Sang, Xingfan Yang, Dai Wu, Ming. Li. General Design of Infrared Terahertz Free‑Electron Laser Facility of Chinese Academy of Engineering Physics[J]. Chinese Journal of Lasers, 2023, 50(17): 1718001

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