Author: Qin, W.
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MOP076 Free-Electron Laser Driven by a 500 MeV Laser Plasma Accelerator Beam 217
 
  • W. Qin, J.E. Chen, S. Huang, K.X. Liu, X.Q. Yan, L. Zeng
    PKU, Beijing, People's Republic of China
  • Y. Ding, Z. Huang
    SLAC, Menlo Park, California, USA
 
  A laser plasma accelerator is under construction at Peking University and several hundred MeV electron beams are expected. In this paper we discuss applying a 500 MeV beam with 1% relative energy spread to FEL. Bunch decompression method is considered to deal with the large energy spread of the beam. Emittance growth induced by large divergence and energy spread in electron beam transport has been treated with the chromatic matching manipulation. Simulation shows that 100 MW level, 6.3 fs , 0.008 bandwidth output can be obtained for 30 nm FEL. TGU method with assumed matched beam is also discussed as a comparison.  
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TUB05 Tunable High-power Terahertz Free-Electron Laser Amplifier 305
 
  • G. Zhao, S. Huang, K.X. Liu, W. Qin, L. Zeng
    PKU, Beijing, People's Republic of China
  • C.H. Chen, Y.C. Chiu, Y.-C. Huang
    NTHU, Hsinchu, Taiwan
 
  In the THz spectrum, radiation sources are relatively scarce. Although recent advancement on optical technologies has enabled THz radiation generation covering a broad spectral range, free-electron laser (FEL) continues to be the most importance source for generating high-power THz radiation. Here we present an ongoing collaboration between Peking University (PKU) and National Tsinghua University (NTHU) to demonstrate high peak and average powers from a THz free-electron laser amplifier driven by a superconducting accelerator system at PKU. The superconducting accelerator comprises the DC-SRF photoinjector and a linac utilizing two 1.3 GHz Tesla-type cavities. It is expected to deliver high repetition rate electron beam with the energy of 10-25 MeV and rms bunch length of about 3 ps. The driver laser of the photoinjector is a mode-locked frequency-quadrupled Nd:YVO4 laser at 266 nm. We use the remaining gun driver laser power at 1064 nm to pump a THz parametric amplifier (TPA) which designed at NTHU and generate the THz seed radiation for the FEL amplifier. The signal laser of the TPA is tunable over 2 THz, permitting generation of radiation between 0.5 and 2.5 THz to seed the FEL amplifier. With our design parameters and computer simulation in GENESIS, we expect to generate narrow-band, wavelength-tunable THz radiation with sub-MW peak power and Watt-level average power.  
slides icon Slides TUB05 [2.349 MB]  
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TUP023 A Modified Self-Seeded X-ray FEL Scheme Towards Shorter Wavelengths 409
 
  • L. Zeng, J.E. Chen, S. Huang, K.X. Liu, W. Qin
    PKU, Beijing, People's Republic of China
  • Y. Ding, Z. Huang, G. Marcus
    SLAC, Menlo Park, California, USA
 
  We present a modified self-seeded FEL scheme for harmonic generation. Different from classical HGHG scheme whose seed laser is a conventional laser with longer wavelength, this scheme first uses a regular self-seeding monochromator to generate a seed laser, followed by a HGHG configuration to produce shorter-wavelength radiations. As an example, we perform start-to-end simulations to demonstrate the second and third harmonic FELs from a soft x-ray self-seeding case at the fundumental wavelength of 1.72 nm. The harmonic performance results will be discussed.  
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