SAP2017 - List of Authors (Tang, C.-X.)

Paper	Title	Page
MOPH11	Beam Dynamics of Grided Electron Gun in Distributed X-ray Sources
	C.J. Tan, Y. C. Du, W.-H. Huang, Q.X. Jin, C.-X. Tang TUB, Beijing, People's Republic of China D.H. Liu, L. Luo NUCTECH, Beijing, People's Republic of China
	Distributed X-ray sources, a single vacuum chamber containing multiple x-ray sources, open the way to innovative system concepts in x-ray and CT. This paper proposed a novel electron beam focusing scheme for distributed x-ray sources. The sources used dispenser cathode as electron emitter, mesh grid to control emission current, and two electrostatic lenses for beam shaping, focusing and deflecting or not. Because the mesh is a non-linear optical system, after beam passes the mesh, the beam emittance grows. In order to minimize this emittance growth, the first lens was placed behind the mesh. The second lens, called focusing lens, with two semi-ellipses opening make the beam shaping, deflecting or not. If the voltages of two semi-elliptical electrodes are different, the beam will deflect after passing through the focusing lens. The voltage difference between the two semi-elliptical focusing lens is set to +V, 0, -V. Then three focal spots will be obtained on the anode target. So that we can use fewer cathodes to get more sources, thereby reducing cost and the difficulty of thermal management, increasing the count of focal spots and improving the image quality.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPH12	Beam Dynamics of a 325 MHz IH-DTL With KONUS	49
	R. Tang, X. Guan, C.-X. Tang, X.W. Wang, Q.Z. Xing, S.X. Zheng TUB, Beijing, People's Republic of China
	A 325 MHz interdigital H-mode drift tube linac (IH-DTL), which is aimed at proton medical facilities, has been proposed and developing at Tsinghua University. The proton beam can be accelerated from 3 MeV to 7 MeV and the peak current of the beam at the exit of the cavity is about 15 mA. A KONUS dynamics without focusing element is applied in this cavity. The co-iteration of dynamics simulation and RF simulation is done. The process and result of the design is presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH12
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPH24	Electromagnetic and Mechanical Design of High Gradient S-band Accelerating Structure in TTX	83
	D.Z. Cao, H.B. Chen, Y. C. Du, W. Gai, W.-H. Huang, J. Shi, C.-X. Tang, H. Zha TUB, Beijing, People's Republic of China
	Thomson scattering x-ray source is an essential scien-tific platform and research tool in x-ray imaging technol-ogy for various fields. Upgrading plan that replacing the 3-meter S-band old linac with shorter high-gradient struc-ture in Tsinghua Thomson scattering X-ray source (TTX) is undergoing so far, aiming to enhance accelerating gradient from 15MV/m to 30MV/m. Detailed parameters of couplers and electromagnetic simulation results of whole acceleration structure are presented in this paper. Finally, mechanical structure and further upgrading re-search on energy with X-band structures are also discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH24
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUAH3	High Intensity Electron Bunch Train and Terahertz Radiation Generation in Tsinghua University
	Z. Zhang, Y.-C. Du, W.-H. Huang, C.-X. Tang, L.X. Yan TUB, Beijing, People's Republic of China
	Electron bunch train, consisting of a large number of equally spaced electron microbunches, have been considered to be applied in advanced accelerators and beam-based high power, narrow-band radiation in terahertz (THz) spectral range. In this paper, we will talk about the theoretical and experimental efforts conducted in Tsinghua University to generate electron bunch trains, including nonlinear space charging oscillation and laser-induced slice energy spread modulation. We will also talk about the applications in THz radiation of the electron bunch trains.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUDH2	Mega-electron-volt Ultrafast Electron Diffraction and Microscope at Tsinghua University	134
	Z. Zhou, Y.-C. Du, W.-H. Huang, C.-X. Tang, L.X. Yan TUB, Beijing, People's Republic of China
	Photocathode gun enabled high brightness, relativistic electron beams with femtosecond to picosecond tunable time structure are powerful tools for structural dynamics study. A prototype MeV UED system has been built and operated at Accelerator laboratory of Tsinghua University since a decade ago. Experiments of high quality single-shot static diffraction as well as pump-probe based dynamical process have been successfully conducted, especially the pump-probe experiment in continuously-time resolved mode to achieve better temporal resolution. These studies demonstrated the sub-picosecond timescale and atomic length resolving capabilities of our UED facility. To meet the growing interest of ultrafast sciences based on MeV UED facility, we are upgrading it to a user facility. Meanwhile the concept design of ultrafast electron microscope is proceeding. The current status of UED/UEM facility will be reported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUDH2
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WECH2	Overall Design and Progress of XiPAF Project	183
	S.X. Zheng, C.B. Bi, H.B. Chen, C. Cheng, C.T. Du, T.B. Du, X. Guan, Q.K. Guo, W.-H. Huang, G.R. Li, P.F. Ma, K.D. Man, C.-X. Tang, R. Tang, D. Wang, W. Wang, X.W. Wang, Q.Z. Xing, Y. Yang, H.J. Yao, H.J. Zeng, H.Y. Zhang, Q. Zhang TUB, Beijing, People's Republic of China W. Chen NINT, Xi'an, People's Republic of China Y.M. Fu, M.T. Qiu, E.Y. Qu, B.C. Wang, D. Wang, M.C. Wang, Y.P. Wang, Z.M. Wang, C.Y. Wei, Y.H. Yan, H.Z. Zhang, C. Zhao, W.L. Liu State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China W.Q. Guan, Y. He, J. Li NUCTECH, Beijing, People's Republic of China
	Xi an Proton Application Facility (XiPAF) which consists of one 230 MeV proton accelerator and irradiation stations, will be constructed in Xi an city, Shaanxi, China. The facility is composed of a 230 MeV synchrotron, a 7 MeV H⁻ linac injector and two experimental stations. It can provide a flux of 10⁵~10⁸ p/cm²/s with the uniformity of better than 90% on the 10 cm×10 cm sample. The overall design of XiPAF accelerator is presented in this paper. And the progress of project is reported also.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-WECH2
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

MOPH11

Beam Dynamics of Grided Electron Gun in Distributed X-ray Sources

C.J. Tan, Y. C. Du, W.-H. Huang, Q.X. Jin, C.-X. Tang
TUB, Beijing, People's Republic of China
D.H. Liu, L. Luo
NUCTECH, Beijing, People's Republic of China

Distributed X-ray sources, a single vacuum chamber containing multiple x-ray sources, open the way to innovative system concepts in x-ray and CT. This paper proposed a novel electron beam focusing scheme for distributed x-ray sources. The sources used dispenser cathode as electron emitter, mesh grid to control emission current, and two electrostatic lenses for beam shaping, focusing and deflecting or not. Because the mesh is a non-linear optical system, after beam passes the mesh, the beam emittance grows. In order to minimize this emittance growth, the first lens was placed behind the mesh. The second lens, called focusing lens, with two semi-ellipses opening make the beam shaping, deflecting or not. If the voltages of two semi-elliptical electrodes are different, the beam will deflect after passing through the focusing lens. The voltage difference between the two semi-elliptical focusing lens is set to +V, 0, -V. Then three focal spots will be obtained on the anode target. So that we can use fewer cathodes to get more sources, thereby reducing cost and the difficulty of thermal management, increasing the count of focal spots and improving the image quality.

Export •

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

MOPH12

Beam Dynamics of a 325 MHz IH-DTL With KONUS

49

R. Tang, X. Guan, C.-X. Tang, X.W. Wang, Q.Z. Xing, S.X. Zheng
TUB, Beijing, People's Republic of China

A 325 MHz interdigital H-mode drift tube linac (IH-DTL), which is aimed at proton medical facilities, has been proposed and developing at Tsinghua University. The proton beam can be accelerated from 3 MeV to 7 MeV and the peak current of the beam at the exit of the cavity is about 15 mA. A KONUS dynamics without focusing element is applied in this cavity. The co-iteration of dynamics simulation and RF simulation is done. The process and result of the design is presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH12

Export •

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

MOPH24

Electromagnetic and Mechanical Design of High Gradient S-band Accelerating Structure in TTX

83

D.Z. Cao, H.B. Chen, Y. C. Du, W. Gai, W.-H. Huang, J. Shi, C.-X. Tang, H. Zha
TUB, Beijing, People's Republic of China

Thomson scattering x-ray source is an essential scien-tific platform and research tool in x-ray imaging technol-ogy for various fields. Upgrading plan that replacing the 3-meter S-band old linac with shorter high-gradient struc-ture in Tsinghua Thomson scattering X-ray source (TTX) is undergoing so far, aiming to enhance accelerating gradient from 15MV/m to 30MV/m. Detailed parameters of couplers and electromagnetic simulation results of whole acceleration structure are presented in this paper. Finally, mechanical structure and further upgrading re-search on energy with X-band structures are also discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH24

Export •

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

TUAH3

High Intensity Electron Bunch Train and Terahertz Radiation Generation in Tsinghua University

Z. Zhang, Y.-C. Du, W.-H. Huang, C.-X. Tang, L.X. Yan
TUB, Beijing, People's Republic of China

Electron bunch train, consisting of a large number of equally spaced electron microbunches, have been considered to be applied in advanced accelerators and beam-based high power, narrow-band radiation in terahertz (THz) spectral range. In this paper, we will talk about the theoretical and experimental efforts conducted in Tsinghua University to generate electron bunch trains, including nonlinear space charging oscillation and laser-induced slice energy spread modulation. We will also talk about the applications in THz radiation of the electron bunch trains.

Export •

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

TUDH2

Mega-electron-volt Ultrafast Electron Diffraction and Microscope at Tsinghua University

134

Z. Zhou, Y.-C. Du, W.-H. Huang, C.-X. Tang, L.X. Yan
TUB, Beijing, People's Republic of China

Photocathode gun enabled high brightness, relativistic electron beams with femtosecond to picosecond tunable time structure are powerful tools for structural dynamics study. A prototype MeV UED system has been built and operated at Accelerator laboratory of Tsinghua University since a decade ago. Experiments of high quality single-shot static diffraction as well as pump-probe based dynamical process have been successfully conducted, especially the pump-probe experiment in continuously-time resolved mode to achieve better temporal resolution. These studies demonstrated the sub-picosecond timescale and atomic length resolving capabilities of our UED facility. To meet the growing interest of ultrafast sciences based on MeV UED facility, we are upgrading it to a user facility. Meanwhile the concept design of ultrafast electron microscope is proceeding. The current status of UED/UEM facility will be reported in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUDH2

Export •

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

WECH2

Overall Design and Progress of XiPAF Project

183

S.X. Zheng, C.B. Bi, H.B. Chen, C. Cheng, C.T. Du, T.B. Du, X. Guan, Q.K. Guo, W.-H. Huang, G.R. Li, P.F. Ma, K.D. Man, C.-X. Tang, R. Tang, D. Wang, W. Wang, X.W. Wang, Q.Z. Xing, Y. Yang, H.J. Yao, H.J. Zeng, H.Y. Zhang, Q. Zhang
TUB, Beijing, People's Republic of China
W. Chen
NINT, Xi'an, People's Republic of China
Y.M. Fu, M.T. Qiu, E.Y. Qu, B.C. Wang, D. Wang, M.C. Wang, Y.P. Wang, Z.M. Wang, C.Y. Wei, Y.H. Yan, H.Z. Zhang, C. Zhao, W.L. Liu
State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Shannxi, People's Republic of China
W.Q. Guan, Y. He, J. Li
NUCTECH, Beijing, People's Republic of China

Xi an Proton Application Facility (XiPAF) which consists of one 230 MeV proton accelerator and irradiation stations, will be constructed in Xi an city, Shaanxi, China. The facility is composed of a 230 MeV synchrotron, a 7 MeV H⁻ linac injector and two experimental stations. It can provide a flux of 10⁵~10⁸ p/cm²/s with the uniformity of better than 90% on the 10 cm×10 cm sample. The overall design of XiPAF accelerator is presented in this paper. And the progress of project is reported also.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-WECH2

Export •

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