Status and upgrade plan of CAEP THz-FEL facility

Kui Zhou; Peng Li; Zheng Zhou; Dexin Xiao; Jianxin Wang; Hanbin Wang; Xing Luo; Lijun Shan; Xuming Shen; Tianhui He; Chenglong Lao; Longgang Yan; Yong Xu; Peng Zhang; Lijun Chen; Weijun Wang; Yu Liu; Jie Liu; Xingfan Yang; Dai Wu; Ming Li

doi:10.11884/HPLPB202234.220091

High Power Laser and Particle Beams, Volume. 34, Issue 10, 104013(2022)

Status and upgrade plan of CAEP THz-FEL facility

Kui Zhou, Peng Li, Zheng Zhou, Dexin Xiao, Jianxin Wang, Hanbin Wang, Xing Luo, Lijun Shan, Xuming Shen, Tianhui He, Chenglong Lao, Longgang Yan, Yong Xu, Peng Zhang, Lijun Chen, Weijun Wang, Yu Liu, Jie Liu, Xingfan Yang, Dai Wu^*, and Ming Li^*

Author Affiliations

Institute of Applied Electronics, CAEP, Mianyang 621900, China

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Figures & Tables(10)

Fig. 1. Beam line layout diagram of CTFEL facility

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Fig. 2. Schematic diagram of CTFEL facility

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Fig. 3. Schematic diagram of the structure of the HV-DC electron gun

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Fig. 4. Measurement results of THz polarization and beam size

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Fig. 5. Measurement results of THz polarization and beam size

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Fig. 6. Beam line layout diagram of the IR-THz FEL facility

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Fig. 7. Layout of the user stations of the IR-THz FEL facility

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Table 1. System parameters of CTFEL facility

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Table 1. System parameters of CTFEL facility

injector parameter	value	SRF accelerator parameter	value	undulator parameter	value
laser wavelength/nm	532	working frequency/GHz	1.3	number of periods	42
repetition rate/MHz	54.167	working temperature/K	2	period length/mm	38
gun voltage/kV	320	effective field gradient/(MV/m)	10	gap range/mm	18～32
bunch length/ps	～12	amplitude stability	0.03%	optical cavity length/mm	2769
beam current/mA	1～5	phase stability/(°)	0.06	curvature radius/mm	2218

Table 2. THz parameters of CTFEL facility

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Table 2. THz parameters of CTFEL facility

parameters	values
THz FEL frequency range/THz	0.67～4.2
bandwidth/%	～2
macro-pulse average power/W	10～60
macro-pulse repetition rate/Hz	1/5/10/20
macro-pulse length/ms	0.3～8
micro-pulse length/ps	＜10
micro-pulse repetition rate/MHz	54.17
peak power/MW	＞0.1
minimum beam size/mm	＜1
polarization direction/%	＞99 (horizontal)
super-radiation frequency range/THz	0.1～0.7
super-radiation electric field/(MV/cm)	～1

Table 3. Design parameters of the IR-THz FEL facility

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Table 3. Design parameters of the IR-THz FEL facility

electron beams		IR-THz FEL
maximum energy/MeV	50	frequency range/THz	0.1～125
energy spread/%	＜0.3 (FWHM)	wavelength range/µm	2.4～3000
normalized emittance @100 pC/µm	＜15	pulse length/ps	0.5～20
bunch charge/pC	50～100	maximum macro-pulse power/W	＞100