Dispersion effects on performance of free-electron laser based on laser wakefield accelerator

Ke Feng; Changhai Yu; Jiansheng Liu; Wentao Wang; Zhijun Zhang; Rong Qi; Ming Fang; Jiaqi Liu; Zhiyong Qin; Ying Wu; Yu Chen; Lintong Ke; Cheng Wang; Ruxin Li

doi:doi:10.1017/hpl.2018.54

High Power Laser Science and Engineering, 2018, 6 (4): 04000e64, Published Online: Dec. 27, 2018

Dispersion effects on performance of free-electron laser based on laser wakefield accelerator Download： 578次

Ke Feng ^1,2Changhai Yu ¹Jiansheng Liu ^1,3Wentao Wang ¹Zhijun Zhang ¹Rong Qi ¹Ming Fang ^1,2Jiaqi Liu ^1,2Zhiyong Qin ^1,2Ying Wu ^1,2Yu Chen ^1,2Lintong Ke ^1,2Cheng Wang ¹Ruxin Li ^1,3,4

Author Affiliations

¹ State Key Laboratory of High Field Laser Physics , Shanghai Institute of Optics and Fine Mechanics , Chinese Academy of Sciences , Shanghai 201800 , China

² University of Chinese Academy of Sciences , Beijing 100049 , China

³ Collaborative Innovation Center of IFSA , Shanghai Jiao Tong University , Shanghai 200240 , China

⁴ School of Physical Science and Technology , ShanghaiTech University, Shanghai 200031 , China

Figures & Tables

Fig. 1. SASE FEL scheme using the PU with the beam from the LWFA. The transverse distribution of the beam (a) without and (c) with the transverse dispersion. (b), (d) Corresponding angular profiles of the radiation power.

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Fig. 2. (a) Radiation power along the PU around 30 nm; (b) single-shot spectra of an SASE FEL; (c), (d) corresponding transverse angular profiles of the radiation power obtained by beam without and with the horizontal dispersion.

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Fig. 3. (a) Radiation power along the PU around 3.9 nm; (b) single-shot spectra of the SASE FEL; (c), (d) corresponding transverse angular profiles of the radiation power obtained by beam without and with the horizontal dispersion.

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Fig. 4. SASE FEL (a) radiation power, (b) bandwidth and (c) transverse mode parameter at 30 nm at the exit of the undulator with different dispersions of the beam in the PU (blue) and TGU (red) schemes.

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Fig. 5. Negative imaginary part of the FEL growth rate (in units of ) as a function of the horizontal position (in units of ) for both the PU and TGU schemes in the fundamental mode ( cm).

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Fig. 6. (a) SASE FEL power with different halfwidths of the slit at the entrance of the undulator in the PU scheme. (b)–(e) Horizontal distribution of the radiation with different halfwidths of the slit in the PU scheme. The halfwidths of the slit are , , and , respectively. The horizontal dispersion is 2.5 cm.

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Table1. beam and undulator parameters used in our study for EUV and soft X-ray FELs.

Parameter	EUV	X-ray
Beam energy	380 MeV	1 GeV
Energy spread	1%	1%
Normalized emittance
Charge	80 pC	80 pC
RMS bunch length
Horizontal dispersion	2.5 cm	2 cm
Undulator parameter	1.15	2
Undulator period	2 cm	1 cm
Undulator length	6 m	6 m
Resonant wavelength	30 nm	3.9 nm

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Ke Feng, Changhai Yu, Jiansheng Liu, Wentao Wang, Zhijun Zhang, Rong Qi, Ming Fang, Jiaqi Liu, Zhiyong Qin, Ying Wu, Yu Chen, Lintong Ke, Cheng Wang, Ruxin Li. Dispersion effects on performance of free-electron laser based on laser wakefield accelerator[J]. High Power Laser Science and Engineering, 2018, 6(4): 04000e64.

Dispersion effects on performance of free-electron laser based on laser wakefield accelerator Download： 578次

Fig. 1. SASE FEL scheme using the PU with the beam from the LWFA. The transverse distribution of the beam (a) without and (c) with the transverse dispersion. (b), (d) Corresponding angular profiles of the radiation power.

Fig. 2. (a) Radiation power along the PU around 30 nm; (b) single-shot spectra of an SASE FEL; (c), (d) corresponding transverse angular profiles of the radiation power obtained by beam without and with the horizontal dispersion.

Fig. 3. (a) Radiation power along the PU around 3.9 nm; (b) single-shot spectra of the SASE FEL; (c), (d) corresponding transverse angular profiles of the radiation power obtained by beam without and with the horizontal dispersion.

Fig. 4. SASE FEL (a) radiation power, (b) bandwidth and (c) transverse mode parameter at 30 nm at the exit of the undulator with different dispersions of the beam in the PU (blue) and TGU (red) schemes.

Fig. 5. Negative imaginary part of the FEL growth rate (in units of ) as a function of the horizontal position (in units of ) for both the PU and TGU schemes in the fundamental mode ( cm).

Table1. beam and undulator parameters used in our study for EUV and soft X-ray FELs.

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Dispersion effects on performance of free-electron laser based on laser wakefield accelerator Download： 578次

Fig. 1. SASE FEL scheme using the PU with the beam from the LWFA. The transverse distribution of the beam (a) without and (c) with the transverse dispersion. (b), (d) Corresponding angular profiles of the radiation power.

Fig. 2. (a) Radiation power along the PU around 30 nm; (b) single-shot spectra of an SASE FEL; (c), (d) corresponding transverse angular profiles of the radiation power obtained by beam without and with the horizontal dispersion.

Fig. 3. (a) Radiation power along the PU around 3.9 nm; (b) single-shot spectra of the SASE FEL; (c), (d) corresponding transverse angular profiles of the radiation power obtained by beam without and with the horizontal dispersion.

Fig. 4. SASE FEL (a) radiation power, (b) bandwidth and (c) transverse mode parameter at 30 nm at the exit of the undulator with different dispersions of the beam in the PU (blue) and TGU (red) schemes.

Fig. 5. Negative imaginary part of the FEL growth rate (in units of ) as a function of the horizontal position (in units of ) for both the PU and TGU schemes in the fundamental mode ( cm).

Table1. beam and undulator parameters used in our study for EUV and soft X-ray FELs.

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