IPAC2017 - List of Authors (Hua, J.F.)

Paper	Title	Page
TUOBB1	Experimental Demonstration of Energy-Chirp Reduction by a Plasma Dechirper	1258
	Y.P. Wu, Z. Cheng, Y.-C. Du, J.F. Hua, W. Lu, C.H. Pai, J. Zhang, S.Y. Zhou, Z. Zhou TUB, Beijing, People's Republic of China
	The first experimental study is presented using a low density plasma dechirper to reduce a correlated energy chirp from the 41.5-MeV, 500-fs (RMS) beam at the linac in Tsinghua University. The plasma dechirper operates through the interaction of the electron bunch with its near linear self-wake to dechirp itself, leading to a reduction in energy spread. The experimental results demonstrate that the projected FWHM energy spread of the beam can be reduced from 1.2% to 0.9% with a 12 mm long plasma dechirper, which are in good agreement with full 3D PIC simulations. Theoretical analyses and simulations indicate that by optimizing the plasma density and length, the plasma dechirper can also be used to completely remove the characteristic energy chirp of the ultra-short high-current bunch generated from plasma based accelerator, such that its energy spread can be reduced from one percent level to 0.1 percent level[]. Application of such a simple and effective method can significantly improve the beam quality and provide the path to realize the future compact free electron lasers and colliders driven by plasma based accelerators. [] Y. P. Wu. A plasma dechirper for electron and positron beams in plasma-based accelerators, to be submitted to Scientific Reports
	Slides TUOBB1 [10.555 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUOBB1
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK024	Study of High Transformer Ratio Plasma Wakefield Acceleration for Accelerator Parameters of SXFEL Using 3D PIC Simulations	1734
	S. Huang, J.F. Hua, F. Li, W. Lu, C.H. Pai, Y. Wan, Y.P. Wu, S.Y. Zhou TUB, Beijing, People's Republic of China W. An, C. Joshi, W.B. Mori, X.L. Xu UCLA, Los Angeles, California, USA H.X. Deng, B. Liu, D. Wang, Z. Wang, Z.T. Zhao SINAP, Shanghai, People's Republic of China
	High transformer ratio (HTR) Plasma Wakefield Accelerator (PWFA) based on shaped electron bunches is an important topic of plasma wakefield acceleration for future light sources and colliders [1]. To explore the possibility of implementing PWFA at SXFEL, we performed 3D PIC simulations using shaped electron beam parameters obtained by start-to-end beam line simulations [2]. The PIC simulations show that an average transformer ratio around 4 can be maintained for about 10 cm long low density plasma, and the energy gain of the trailing bunch eventually reaches 5.9 GeV. Simulations and analysis are also performed to check the effects of transverse beam size on HTR acceleration. In addition, plasma density downramp injection has also been tested as a possible high brightness injection method for HTR acceleration, and preliminary results will be presented. [] Lu W, An W, Huang C, et al. High Transformer ratio PWFA for Applications on XFELs. Bulletin of the American Physical Society, 2009, 54. [*] Z. Wang, Z. T. Zhao, et al. private communication
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK024
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Experimental Demonstration of Energy-Chirp Reduction by a Plasma Dechirper

1258

Y.P. Wu, Z. Cheng, Y.-C. Du, J.F. Hua, W. Lu, C.H. Pai, J. Zhang, S.Y. Zhou, Z. Zhou
TUB, Beijing, People's Republic of China

The first experimental study is presented using a low density plasma dechirper to reduce a correlated energy chirp from the 41.5-MeV, 500-fs (RMS) beam at the linac in Tsinghua University. The plasma dechirper operates through the interaction of the electron bunch with its near linear self-wake to dechirp itself, leading to a reduction in energy spread. The experimental results demonstrate that the projected FWHM energy spread of the beam can be reduced from 1.2% to 0.9% with a 12 mm long plasma dechirper, which are in good agreement with full 3D PIC simulations. Theoretical analyses and simulations indicate that by optimizing the plasma density and length, the plasma dechirper can also be used to completely remove the characteristic energy chirp of the ultra-short high-current bunch generated from plasma based accelerator, such that its energy spread can be reduced from one percent level to 0.1 percent level[*]. Application of such a simple and effective method can significantly improve the beam quality and provide the path to realize the future compact free electron lasers and colliders driven by plasma based accelerators.
[*] Y. P. Wu. A plasma dechirper for electron and positron beams in plasma-based accelerators, to be submitted to Scientific Reports

Slides TUOBB1 [10.555 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUOBB1

Export •

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

TUPIK024

Study of High Transformer Ratio Plasma Wakefield Acceleration for Accelerator Parameters of SXFEL Using 3D PIC Simulations

1734

S. Huang, J.F. Hua, F. Li, W. Lu, C.H. Pai, Y. Wan, Y.P. Wu, S.Y. Zhou
TUB, Beijing, People's Republic of China
W. An, C. Joshi, W.B. Mori, X.L. Xu
UCLA, Los Angeles, California, USA
H.X. Deng, B. Liu, D. Wang, Z. Wang, Z.T. Zhao
SINAP, Shanghai, People's Republic of China

High transformer ratio (HTR) Plasma Wakefield Accelerator (PWFA) based on shaped electron bunches is an important topic of plasma wakefield acceleration for future light sources and colliders [1]. To explore the possibility of implementing PWFA at SXFEL, we performed 3D PIC simulations using shaped electron beam parameters obtained by start-to-end beam line simulations [2]. The PIC simulations show that an average transformer ratio around 4 can be maintained for about 10 cm long low density plasma, and the energy gain of the trailing bunch eventually reaches 5.9 GeV. Simulations and analysis are also performed to check the effects of transverse beam size on HTR acceleration. In addition, plasma density downramp injection has also been tested as a possible high brightness injection method for HTR acceleration, and preliminary results will be presented.
[*] Lu W, An W, Huang C, et al. High Transformer ratio PWFA for Applications on XFELs. Bulletin of the American Physical Society, 2009, 54.
[**] Z. Wang, Z. T. Zhao, et al. private communication

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK024

Export •

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