SAP2017 - List of Authors (Chen, J.E.)

Paper	Title	Page
MOBH1	Experimental Study on the Electron Superconducting Linac and its Application	1
	K.X. Liu, J.E. Chen, L.W. Feng, J.K. Hao, S. Huang, L. Lin, S.W. Quan, F. Wang, H.M. Xie, L. Yang, F. Zhu PKU, Beijing, People's Republic of China
	Experimental study on superconducting electron linac has been developed at Peking University. Stable operation of a DC-SRF photoinjector and a 2*9-cell SRF linac has been realized with an average beam current of mA scale in macro pulses of several ms with a repetition rate of 10 Hz. A compact high repetition rate THz radiation source has been developed based on DC-SRF photo-injector through velocity bunching. Superradiant THz radiation with a repetition rate of 16.25 MHz and a frequency that can be tuned from 0.24 to 0.42 THz was generated by varying the electron beam energy from 2.4 to 3.1 MeV. MeV UED at MHz repetition rate has been demonstrated experimentally using electron pulses from the DC-SRF photoinjector. THz undulator radiation of ~1THz central frequency with an average power of 1W has been achieved with 13MeV electron beam from SRF linac and applications are underway.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOBH1
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TUCH2	Progress on Laser Plasma Electron Acceleration Research in Peking University
	H.Y. Lu, J.E. Chen, L.R.F. Li, X.Q. Yan, Y.Y. Zhao PKU, Beijing, People's Republic of China
	High power femtosecond laser pulse can be achieved as the technological innovation with chirped pulse amplification (CPA) and high power pulse amplification. The concept of laser plasma based accelerator has turn to realization in recent years. The laser intensity can be retained with a long distance in plasma through technical control of Rayleigh length, self-focusing, and laser guiding. Electrons can be accelerated upto GeV energy in centimeter scale, as there is no voltage breakdown in plasma, which results in a 100GV/m acceleration field as well. There are two main mechanisms of electron acceleration in laser-plasma acceleration, Direct laser acceleration (DLA) and Laser wakefiled acceleration (LWFA), which prevail in different plasma density regime. A 200-TW laser facility was recently built in Peking University, specified for laser plasma acceleration research. Different laser conditions were investigated to generate electrons which allow us to achieve electrons with energy up to 290 MeV with relatively small divergence angle of 4 mrad, and also can achieve lower energy electrons with several pC charge for direct imaging or generating X-ray for imaging as well.
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WEAH3	Proton Beam Line of Compact Laser Plasma Accelerator at Peking University
	J.G. Zhu, J.E. Chen, Q. Liao, C. Lin, H.Y. Lu, Y.R. Lu, W.J. Ma, Wu,M.J. Wu, X. Xu, X.Q. Yan, A.L. Zhang, Y.Y. Zhao, K. Zhu PKU, Beijing, People's Republic of China
	Funding: Supported by the National Natural Science Foundation of China under Grant No. 11575011, and National Grand Instrument Project under Grant No 2012YQ030142. A proton-type of compact laser plasma accelerator (CLAPA) has been built at Peking University. Stable proton beams have been generated in the experiments of high intensity (8.3*10¹⁹ W/cm²) laser pulses irradiating on home-made sub-micrometer thick plastic targets. The temporal contrast of the laser pulse was 10¹⁰ at 100 ps before the main pulse with a cross-polarized wave (XPW) system, and no plasma mirror was used in CLAPA system. The maximum proton energy exceeded 15 MeV when using 1.2 um plastic targets. Proton beams with energy higher than 8.5 MeV were also detected with 20 nm thick plastic targets. A beam line that consists of common magnetic devices is also designed and built, aiming to deliver proton beams with energy of 1~44 MeV, energy spread of ±5% and 10⁸ protons per pulse to the irradiation target platform. The parameters of the beamline system are carefully designed and optimised to obtain a radially symmetric proton distribution at the irradiation platform. In the preliminary CLAPA accelerator and beam line joint experiments, the effective transporting and focusing of accelerated protons with selected energy has been observed.
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Paper

Title

Page

Experimental Study on the Electron Superconducting Linac and its Application

1

K.X. Liu, J.E. Chen, L.W. Feng, J.K. Hao, S. Huang, L. Lin, S.W. Quan, F. Wang, H.M. Xie, L. Yang, F. Zhu
PKU, Beijing, People's Republic of China

Experimental study on superconducting electron linac has been developed at Peking University. Stable operation of a DC-SRF photoinjector and a 2*9-cell SRF linac has been realized with an average beam current of mA scale in macro pulses of several ms with a repetition rate of 10 Hz. A compact high repetition rate THz radiation source has been developed based on DC-SRF photo-injector through velocity bunching. Superradiant THz radiation with a repetition rate of 16.25 MHz and a frequency that can be tuned from 0.24 to 0.42 THz was generated by varying the electron beam energy from 2.4 to 3.1 MeV. MeV UED at MHz repetition rate has been demonstrated experimentally using electron pulses from the DC-SRF photoinjector. THz undulator radiation of ~1THz central frequency with an average power of 1W has been achieved with 13MeV electron beam from SRF linac and applications are underway.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOBH1

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUCH2

Progress on Laser Plasma Electron Acceleration Research in Peking University

H.Y. Lu, J.E. Chen, L.R.F. Li, X.Q. Yan, Y.Y. Zhao
PKU, Beijing, People's Republic of China

High power femtosecond laser pulse can be achieved as the technological innovation with chirped pulse amplification (CPA) and high power pulse amplification. The concept of laser plasma based accelerator has turn to realization in recent years. The laser intensity can be retained with a long distance in plasma through technical control of Rayleigh length, self-focusing, and laser guiding. Electrons can be accelerated upto GeV energy in centimeter scale, as there is no voltage breakdown in plasma, which results in a 100GV/m acceleration field as well. There are two main mechanisms of electron acceleration in laser-plasma acceleration, Direct laser acceleration (DLA) and Laser wakefiled acceleration (LWFA), which prevail in different plasma density regime. A 200-TW laser facility was recently built in Peking University, specified for laser plasma acceleration research. Different laser conditions were investigated to generate electrons which allow us to achieve electrons with energy up to 290 MeV with relatively small divergence angle of 4 mrad, and also can achieve lower energy electrons with several pC charge for direct imaging or generating X-ray for imaging as well.

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEAH3

Proton Beam Line of Compact Laser Plasma Accelerator at Peking University

J.G. Zhu, J.E. Chen, Q. Liao, C. Lin, H.Y. Lu, Y.R. Lu, W.J. Ma, Wu,M.J. Wu, X. Xu, X.Q. Yan, A.L. Zhang, Y.Y. Zhao, K. Zhu
PKU, Beijing, People's Republic of China

Funding: Supported by the National Natural Science Foundation of China under Grant No. 11575011, and National Grand Instrument Project under Grant No 2012YQ030142.
A proton-type of compact laser plasma accelerator (CLAPA) has been built at Peking University. Stable proton beams have been generated in the experiments of high intensity (8.3*10¹⁹ W/cm²) laser pulses irradiating on home-made sub-micrometer thick plastic targets. The temporal contrast of the laser pulse was 10¹⁰ at 100 ps before the main pulse with a cross-polarized wave (XPW) system, and no plasma mirror was used in CLAPA system. The maximum proton energy exceeded 15 MeV when using 1.2 um plastic targets. Proton beams with energy higher than 8.5 MeV were also detected with 20 nm thick plastic targets. A beam line that consists of common magnetic devices is also designed and built, aiming to deliver proton beams with energy of 1~44 MeV, energy spread of ±5% and 10⁸ protons per pulse to the irradiation target platform. The parameters of the beamline system are carefully designed and optimised to obtain a radially symmetric proton distribution at the irradiation platform. In the preliminary CLAPA accelerator and beam line joint experiments, the effective transporting and focusing of accelerated protons with selected energy has been observed.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)