| Paper |
Title |
Page |
| MOPPH078 |
Terahertz Cherenkov Free–Electron Laser
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157 |
| |
- D. Li, K. Imasaki
ILT, Suita, Osaka
- M. R. Asakawa
Kansai University, Osaka
- G. Huo
Oil Production Research Institute, Dongying
- W. Liu
UESTC, Chengdu, Sichuan
- G. S. Park
SNU, Seoul
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In the development of compact terahertz radiation source, a table-top Cherenkov free-electron laser is proposed. The simplified model is consisted of a double-slap device, including a rectangular waveguide partially filled with two lined parellel dielectric slabs, driven by a 50 keV electron beam. The dispersion relation of such a model is investigated theoretically and the dispersion equation is solved numerically. With the help of a particle-in-cell simulation code, the mechanism of beam-wave interaction is carefully analized. According to those simulation results, we found the optimum parameters for this kind of device to operate at the terahertz wave region.
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| TUPPH081 |
Smith-Purcell Free-Electron Laser with Sidewall Grating
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432 |
| |
- D. Li, K. Imasaki
ILT, Suita, Osaka
- G. S. Park
SNU, Seoul
- Z. Yang
UESTC, Chengdu, Sichuan
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A sidewall grating for the Smith-Purcell device is proposed to enhance the coupling of the optical mode with the electron beam and consequently relax the stringent requirements to the electron beam. With the help of three-dimensional particle-in-cell simulations, it has been shown that, comparing with the general grating the usage of a sidewall grating improves the growth rate and dramatically shortens the time for the device to reach saturation. The transverse profile of the electric field is also addressed.
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| TUPPH083 |
Positron Generation through Laser Compton Scattering Gamma-ray
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439 |
| |
- D. Li, K. Imasaki
ILT, Suita, Osaka
- S. Amano, K. Horikawa, K. Ishihara, S. Miyamoto, T. Mochizuki
NewSUBARU/SPring-8, Laboratory of Advanced Science and Technology for Industry (LASTI), Hyogo
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Positron sources are important for linear colliders and are valuable tools in research of materials science, atomic physics and solid state physics. The proposal of positron generation through high-energy photon beams was presented several years ago, however, experiments are rare. In this paper, we report an experiment for generating positron beams. The experiment is based on a high-energy gamma-ray produced through Compton scattering of laser light from a high energy electron beam in a storage ring. The gamma-ray is then arranged to impinge on a thin Pb target to generate positrons and electrons via pair creation reaction. This process is also studied with the help of MCNP5 Monte Carlo simulation, for comparison with the experimental results. The imaging plate is used to record generated particles. Processing those images we can get information of positrons, electrons and photons, such as flux and energy spectrum.
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