IPAC2014 - List of Authors (Tang, C.-X.)

Paper	Title	Page
TUOBB03	Recent Progress on High Quality Electron Beam Generation through Plasma-based Acceleration at Tsinghua University
	W. Lu, Y.-C. Du, J.F. Hua, W.-H. Huang, F. Li, C.H. Pai, J. Shi, C.-X. Tang, Y. Wan, Y.P. Wu, X.L. Xu, L.X. Yan, C.J. Zhang TUB, Beijing, People's Republic of China C. Joshi, W.B. Mori UCLA, Los Angeles, California, USA
	Recent progress of plasma based acceleration at Tsinghua University will be presented. On the theory and simulation part, several ideas on how to obtain high quality electron beams with extremely high brightness through wakefield acceleration will be discussed in details, including two recently published works based on ionization injection method(PRL 111, 015003, 2013; PRL 112, 035003, 2014); On the experiment part, our recent results of high quality 20-30MeV electron beams with very low energy spread, with minimal absolute energy spread of 0.18MeV RMS and relative energy spread 0.8% RMS, will be presented.
	Slides TUOBB03 [11.000 MB]
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TUPME040	Drive Beam Break-up Control and Practical Gradient Limitation in Collinear Dielectric Wakefield Accelerators	1443
	C. Li, W. Gai, J.G. Power, A. Zholents ANL, Argonne, Ilinois, USA C.-J. Jing Euclid TechLabs, LLC, Solon, Ohio, USA C. Li, C.-X. Tang TUB, Beijing, People's Republic of China
	Dielectric wakefield accelerator (DWA) concept has gained significant attention for the need of the future large scale facilities. For a practical machine, one needs to overcome a major challenge for the DWA that is the efficient energy extraction and stable propagation at the same time for the drive beam. Typically, a slightly off axis beam become unstable in the dielectric channel due to transverse wakefield excitation, that could be controlled if a strong external alternating magnetic focusing channel applied at the same time. However, there is limitation on the practical magnetic field in the focusing channel (typically < 1 Tesla), thus imposing operating point for the DWA. In this article, we explore the operating point of the DWA for various structure frequencies and drive beam charge, particularly on the gradient and total acceleration distance, and provide guidance on the DWA design.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME040
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THOAB03	A High Resolution Spatial-temporal Imaging Diagnostic for High Energy Density Physics Experiments	2819
	W. Gai ANL, Argonne, Illinois, USA S. Cao, H.S. Xu, W.-L. Zhan, Z.M. Zhang, Y.T. Zhao IMP, Lanzhou, People's Republic of China J.Q. Qiu Euclid TechLabs, LLC, Solon, Ohio, USA C.-X. Tang TUB, Beijing, People's Republic of China
	We present a scheme that uses a high energy electron beam as a probe for time resolved (~ pico – nano seconds) imaging measurements of high energy density processes in materials with spatial resolution of < 1 μm. The device uses an electron bunch train with a flexible time structure penetrating a time varying high density target. By imaging the scattered electron beam, the detailed target profile and its density evolution can be accurately determined. In this paper, we discuss the viability of the concept and show that for densities in the range up to 400 gram/cm³, an electron beam consisting of a train of ~800 MeV bunchlets, each a few ps long and with charges ~nC is suitable. Successful demonstration of this concept will have a major impact for both future fusion science and HEDP physics research.
	Slides THOAB03 [2.493 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THOAB03
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THPRI076	Laser Triggered RF Breakdown Study Using an S-band Photocathode Gun	3943
	J.H. Shao, W. Gai ANL, Argonne, Illinois, USA H.B. Chen, Y.-C. Du, W.-H. Huang, J. Shi, C.-X. Tang, L.X. Yan TUB, Beijing, People's Republic of China C.-J. Jing Euclid TechLabs, LLC, Solon, Ohio, USA F.Y. Wang SLAC, Menlo Park, California, USA
	A laser triggered RF breakdown experiment was carried out with an S-band photocathode gun at Tsinghua University for attempting understanding of the RF breakdown processes. By systematic measurement of the time dependence of the breakdown current at the gun exit and the stored RF energy in the cavity, one might gain insight into the time evolution of RF breakdown physics. A correlation of the stored energy and field emission current has been analysed with an equivalent circuit model. Experimental details and analysis methods are reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI076
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Paper

Title

Page

TUOBB03

Recent Progress on High Quality Electron Beam Generation through Plasma-based Acceleration at Tsinghua University

W. Lu, Y.-C. Du, J.F. Hua, W.-H. Huang, F. Li, C.H. Pai, J. Shi, C.-X. Tang, Y. Wan, Y.P. Wu, X.L. Xu, L.X. Yan, C.J. Zhang
TUB, Beijing, People's Republic of China
C. Joshi, W.B. Mori
UCLA, Los Angeles, California, USA

Recent progress of plasma based acceleration at Tsinghua University will be presented. On the theory and simulation part, several ideas on how to obtain high quality electron beams with extremely high brightness through wakefield acceleration will be discussed in details, including two recently published works based on ionization injection method(PRL 111, 015003, 2013; PRL 112, 035003, 2014); On the experiment part, our recent results of high quality 20-30MeV electron beams with very low energy spread, with minimal absolute energy spread of 0.18MeV RMS and relative energy spread 0.8% RMS, will be presented.

Slides TUOBB03 [11.000 MB]

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

TUPME040

Drive Beam Break-up Control and Practical Gradient Limitation in Collinear Dielectric Wakefield Accelerators

1443

C. Li, W. Gai, J.G. Power, A. Zholents
ANL, Argonne, Ilinois, USA
C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio, USA
C. Li, C.-X. Tang
TUB, Beijing, People's Republic of China

Dielectric wakefield accelerator (DWA) concept has gained significant attention for the need of the future large scale facilities. For a practical machine, one needs to overcome a major challenge for the DWA that is the efficient energy extraction and stable propagation at the same time for the drive beam. Typically, a slightly off axis beam become unstable in the dielectric channel due to transverse wakefield excitation, that could be controlled if a strong external alternating magnetic focusing channel applied at the same time. However, there is limitation on the practical magnetic field in the focusing channel (typically < 1 Tesla), thus imposing operating point for the DWA. In this article, we explore the operating point of the DWA for various structure frequencies and drive beam charge, particularly on the gradient and total acceleration distance, and provide guidance on the DWA design.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME040

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

THOAB03

A High Resolution Spatial-temporal Imaging Diagnostic for High Energy Density Physics Experiments

2819

W. Gai
ANL, Argonne, Illinois, USA
S. Cao, H.S. Xu, W.-L. Zhan, Z.M. Zhang, Y.T. Zhao
IMP, Lanzhou, People's Republic of China
J.Q. Qiu
Euclid TechLabs, LLC, Solon, Ohio, USA
C.-X. Tang
TUB, Beijing, People's Republic of China

We present a scheme that uses a high energy electron beam as a probe for time resolved (~ pico – nano seconds) imaging measurements of high energy density processes in materials with spatial resolution of < 1 μm. The device uses an electron bunch train with a flexible time structure penetrating a time varying high density target. By imaging the scattered electron beam, the detailed target profile and its density evolution can be accurately determined. In this paper, we discuss the viability of the concept and show that for densities in the range up to 400 gram/cm³, an electron beam consisting of a train of ~800 MeV bunchlets, each a few ps long and with charges ~nC is suitable. Successful demonstration of this concept will have a major impact for both future fusion science and HEDP physics research.

Slides THOAB03 [2.493 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THOAB03

Export •

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

THPRI076

Laser Triggered RF Breakdown Study Using an S-band Photocathode Gun

3943

J.H. Shao, W. Gai
ANL, Argonne, Illinois, USA
H.B. Chen, Y.-C. Du, W.-H. Huang, J. Shi, C.-X. Tang, L.X. Yan
TUB, Beijing, People's Republic of China
C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio, USA
F.Y. Wang
SLAC, Menlo Park, California, USA

A laser triggered RF breakdown experiment was carried out with an S-band photocathode gun at Tsinghua University for attempting understanding of the RF breakdown processes. By systematic measurement of the time dependence of the breakdown current at the gun exit and the stored RF energy in the cavity, one might gain insight into the time evolution of RF breakdown physics. A correlation of the stored energy and field emission current has been analysed with an equivalent circuit model. Experimental details and analysis methods are reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI076

Export •

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