IPAC2019 - List of Authors (Zhang, J.)

Paper	Title	Page
WEZZPLS1	Experimental Demonstration of External Injection From a Linac into a LWFA with ~100% Capture Efficiency
	J.F. Hua, Y.C. Du, Y. Fang, S. Liu, W. Lu, C.H. Pai, B. Peng, Y.P. Wu, J. Zhang, Z. Zhou TUB, Beijing, People’s Republic of China
	Staging of conventional accelerators and advanced plasma-based accelerators can boost the beam energy while at the same time better control the beam quality, therefore it is essential for high-energy applications such as TeV-level colliders. Here we present the first successful demonstration of external injection from a linear accelerator (LINAC) into a laser wakefield accelerator (LWFA) and the subsequent acceleration with ~100% capture efficiency. Stable 31MeV, 20fC electron beams from the LINAC were velocity bunched to the length of ~15fs (r.m.s.) in the high-gradient photocathode RF gun and then external injected into the linear wakefield excited by the 10TW, 42fs laser. The experimental results show that nearly all the electrons can be mono-energetically accelerated and the maximum energy gain reaches 1.8MeV in a 6-mm long plasma, corresponding to an average gradient of about 300MV/m. High capture efficiency of external injection has also been systematically validated by 3D PIC simulations. This paves the way toward the development of high-energy particle accelerators for future colliders.
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THPGW048	Temporal Characterization of Electron Bunches From Self-Injection and Ionization Injection in a Laser Wakefield Accelerator	3693
	J. Zhang, Y.X. He, J.F. Hua, D.X. Liu, W. Lu, Y. Ma, C.H. Pai, Y.P. Wu TUB, Beijing, People’s Republic of China Z. Nie, Q. Su UCLA, Los Angeles, California, USA
	Plasma based accelerators (PBAs) have a proven capability to generate high energy electron beams with ultrashort duration (~ 10 fs) and high peak current (~ 10 kA), which opens the opportunity for compact free electron lasers. To meet the requirements of such challenging applications, controllable injection is highly needed to produce high-quality and highly stable electron beams. As we know, the beam parameters，including the current profile, strongly depend on the injection process. To explore the underlying physics and optimize beam parameters in PBAs, a temporal characterization is highly required for different injection schemes. Based on coherent transition radiation(CTR) method, the preliminary experiment to measure beam temporal profiles from both self-injection and ionization injection schemes in a single-shot mode has been performed at Tsinghua University. And the simulations using the similar experimental parameters have been performed to interpret the different injection processes, which show some agreement with the experimental results, especially for the features of bunch durations
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW048
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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Paper

Title

Page

WEZZPLS1

Experimental Demonstration of External Injection From a Linac into a LWFA with ~100% Capture Efficiency

J.F. Hua, Y.C. Du, Y. Fang, S. Liu, W. Lu, C.H. Pai, B. Peng, Y.P. Wu, J. Zhang, Z. Zhou
TUB, Beijing, People’s Republic of China

Staging of conventional accelerators and advanced plasma-based accelerators can boost the beam energy while at the same time better control the beam quality, therefore it is essential for high-energy applications such as TeV-level colliders. Here we present the first successful demonstration of external injection from a linear accelerator (LINAC) into a laser wakefield accelerator (LWFA) and the subsequent acceleration with ~100% capture efficiency. Stable 31MeV, 20fC electron beams from the LINAC were velocity bunched to the length of ~15fs (r.m.s.) in the high-gradient photocathode RF gun and then external injected into the linear wakefield excited by the 10TW, 42fs laser. The experimental results show that nearly all the electrons can be mono-energetically accelerated and the maximum energy gain reaches 1.8MeV in a 6-mm long plasma, corresponding to an average gradient of about 300MV/m. High capture efficiency of external injection has also been systematically validated by 3D PIC simulations. This paves the way toward the development of high-energy particle accelerators for future colliders.

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THPGW048

Temporal Characterization of Electron Bunches From Self-Injection and Ionization Injection in a Laser Wakefield Accelerator

3693

J. Zhang, Y.X. He, J.F. Hua, D.X. Liu, W. Lu, Y. Ma, C.H. Pai, Y.P. Wu
TUB, Beijing, People’s Republic of China
Z. Nie, Q. Su
UCLA, Los Angeles, California, USA

Plasma based accelerators (PBAs) have a proven capability to generate high energy electron beams with ultrashort duration (~ 10 fs) and high peak current (~ 10 kA), which opens the opportunity for compact free electron lasers. To meet the requirements of such challenging applications, controllable injection is highly needed to produce high-quality and highly stable electron beams. As we know, the beam parameters，including the current profile, strongly depend on the injection process. To explore the underlying physics and optimize beam parameters in PBAs, a temporal characterization is highly required for different injection schemes. Based on coherent transition radiation(CTR) method, the preliminary experiment to measure beam temporal profiles from both self-injection and ionization injection schemes in a single-shot mode has been performed at Tsinghua University. And the simulations using the similar experimental parameters have been performed to interpret the different injection processes, which show some agreement with the experimental results, especially for the features of bunch durations

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW048

About •

paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

Export •

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