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Du, Y.-C.

Paper Title Page
MO6RFP095 The Megaelectron-Volt Ultrafast Electron Diffraction Experiment at Tsinghua University 590
 
  • R.K. Li, H. Chen, Q. Du, T. Du, Y.-C. Du, W.-H. Huang, J. Shi, C.-X. Tang, L.X. Yan
    TUB, Beijing
  • X.J. Wang
    BNL, Upton, Long Island, New York
  
 

Funding: Supported by National Natural Science Foundation of China (No.10735050, No.10875070) and National Basic Research Program of China (973 Program)(No.2007CB815102)


Time-resolved MeV ultra-fast electron diffraction (UED) is a promising tool for studying of structural dynamics on the fundamental temporal and spatial scales of atomic motion. To reach the desired temporal and spatial resolutions, precise control and measurement of ultra-short, low emittance electron pulses are required. A MeV UED system based on an S-band photocathode RF gun is built and optimized at Tsinghua University. We present the experiment results here.

  
TU6PFP031 Research on a Terahertz Coherent Transition Radiation Source Based on Ultrashort Electron Beam 1357
 
  • W. Liu, Y.-C. Du, W.-H. Huang, C.-X. Tang, D. Wu
    TUB, Beijing
  
 

The preliminary experiments and three-dimensional (3D) particle-in-cell (PIC) simulations of terahertz (THz) coherent transition radiation (CTR) performed at the Accelerator Laboratory of Tsinghua University are reported in this paper. THz radiation is generated from the interactions of Titanium foil with the ultrashort electron beam produced by the photocathode RF gun. The frequency and power of radiation are measured with the Martin-Pupllet interferometer and Gollay Cell detector, respectively. The radiation characteristics depending on the foil properties are preliminarily studied with the experiments and PIC simulations. On the other hand, the distribution of radiation field pattern and energy are studied by numerical calculated, and those results are in agreement with the PIC simulations.

  
TH5PFP094 Bunch Length Measurement with RF Deflecting Cavity at Tsinghua Thomson-Scattering X-Ray Source 3429
 
  • J. Shi, H. Chen, Q. Du, Y.-C. Du, W.-H. Huang, R.K. Li, C.-X. Tang, L.X. Yan
    TUB, Beijing
  • D. Li
    LBNL, Berkeley, California
  
 

Funding: Supported by National Natural Science Foundation of China (No.10775080)


An S-band RF deflecting cavity has been developed and applied for measuring the bunch length at Tsinghua Thomson-Scattering X-ray Source (TTX). This paper briefly introduces the 3-cell pi-mode standing-wave deflecting cavity and reports the recent experiments of the beam diagnostics for the photo-cathode RF gun, which produces electron bunches with RMS length around 1-ps. It is also observed that the bunches are lengthened while the total charge increases, showing the strong space charge effect at a low beam energy.