Photoinjector‐Laser Longitudinal Flat‐Top Shaping of Dalian Advanced Light Source and Corresponding Beam Dynamics Simulation

Qinghua Gao; Xinmeng Li; Baichao Zhang; Dongyuan Yang; Yong Yu; Weiqing Zhang; Zhigang He; Shengrui Yu; Guorong Wu; Xueming Yang

doi:10.3788/CJL240576

Chinese Journal of Lasers, Volume. 51, Issue 14, 1405001(2024)

Photoinjector‐Laser Longitudinal Flat‐Top Shaping of Dalian Advanced Light Source and Corresponding Beam Dynamics Simulation

Qinghua Gao^1,2, Xinmeng Li^2,3, Baichao Zhang⁴, Dongyuan Yang², Yong Yu^4,5, Weiqing Zhang², Zhigang He^2、*, Shengrui Yu¹, Guorong Wu², and Xueming Yang^2,5

Author Affiliations

¹Hangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, Zhejiang , China

²State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning , China

³University of Chinese Academy of Sciences, Beijing 100049, China

⁴Institute of Advanced Science Facilities, Shenzhen , 518107, Guangdong , China

⁵Department of Chemistry and Center for Advanced Light Source, College of Science, Southern University of Science and Technology, Shenzhen 518055, Guangdong , China

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Figures & Tables(11)

Fig. 1. Layout of pulse shaping and measurement optical path

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Fig. 2. Schematic diagram of generating pulse train using birefringent crystals

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Fig. 3. Results of pulse shaping of ultraviolet laser pulse passing through different components. (a) Grating pair; (b) a Michelson interferometer; (c) two Michelson interferometers; (d) three α-BBO crystals

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Fig. 4. Ultraviolet laser spectrums. (a) Before pulse shaping; (b) after pulse shaping

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Fig. 5. Laser beam profiles. (a) Before pulse shaping; (b) after pulse shaping

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Fig. 6. Transmission efficiency of pulse shaping optical path

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Fig. 7. Physical layout of DALS injector

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Fig. 8. Optimized results of electron beam dynamics for lasers with different longitudinal distributions. (a) Measured and ideal flat-top or Gaussian distributions; (b) corresponding electron beam Pareto fronts of normalized emittance and bunch length at exit of DALS injector

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Fig. 9. Linear relationship curve between the charge of DALS injector and the normalized emittance of the beam for a 300 kV DC gun with an ideal flat-top laser distribution

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Table 1. α-BBO crystals $a_{1}$ , $a_{2}$ , $a_{3}$ , $a_{4}$
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Table 1. α-BBO crystals $a_{1}$ , $a_{2}$ , $a_{3}$ , $a_{4}$
Constant o e
$a_{1}$ 2.74710 2.37153
$a_{2}$ 0.01878 0.01224
$a_{3}$ -0.01822 -0.01667
$a_{4}$ -0.01354 -0.01516

Table 2. Main laser parameters and corresponding minimum emittance limits of electron beam dynamics

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Table 2. Main laser parameters and corresponding minimum emittance limits of electron beam dynamics

Parameter	Measured flat laser	Ideal flat laser	Measured Gaussian laser	Ideal Gaussian laser
Laser time duration （RMS） /ps	13	13	8	8
Laser trans. size （RMS） /mm	0.38	0.38	0.38	0.38
Emittance of electron beam /（mm·mrad）	0.545	0.523	0.668	0.673

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Qinghua Gao, Xinmeng Li, Baichao Zhang, Dongyuan Yang, Yong Yu, Weiqing Zhang, Zhigang He, Shengrui Yu, Guorong Wu, Xueming Yang. Photoinjector‐Laser Longitudinal Flat‐Top Shaping of Dalian Advanced Light Source and Corresponding Beam Dynamics Simulation[J]. Chinese Journal of Lasers, 2024, 51(14): 1405001

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