Author: Taira, Y.
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TUPOW047 Generation of a Coherent Cherenkov Radiation by using Electron Bunch Tilting 1870
 
  • K. Sakaue
    Waseda University, Waseda Institute for Advanced Study, Tokyo, Japan
  • R. Kuroda, Y. Taira
    AIST, Tsukuba, Japan
  • M. Nishida, M. Washio
    Waseda University, Tokyo, Japan
  • J. Urakawa
    KEK, Ibaraki, Japan
  
  We have been developing a compact accelerator based a laser photocathode rf electron gun at Waseda University. Low emittance and short bunched electron beam can be generated from the gun. Also, the rf transverse deflecting cavity was developed for the bunch length measurement. We performed an experiment for generating a coherent Cherenkov radiation using bunch tilting. The rf transverse deflector can give a tilt for the electron bunch, and the tilt angle was set to the Cherenkov radiating angle which determined by the target refractive index. We successfully demonstrated a coherent Cherenkov radiation and the characterization of the radiation. The principle of coherent Cherenkov radiation generation, the experimental results and future prospective will be presented at the conference.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW047  
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TUPOY046 Study on NRF-CT Imaging by Laser Compton Backscattering Gamma-rays in UVSOR 2007
 
  • H. Ohgaki, I. Daito, T. Kii, H. Zen
    Kyoto University, Kyoto, Japan
  • T. Hayakawa, T. Shizuma
    JAEA, Ibaraki-ken, Japan
  • M. Katoh, J. Yamazaki
    UVSOR, Okazaki, Japan
  • Y. Taira, H. Toyokawa
    AIST, Ibaraki, Japan
  
  Funding: This work was supported by JSPS KAKENHI Grant Number 26289363, 24340060 and the Joint Studies Program (2014) of the Institute for Molecular Science.
Monochromatic gamma-ray beam in MeV energy region is suitable for non-destructive inspection of high density and massive objects because of its high penetrability. A specific nuclide can be detected by the process of Nuclear Resonance Fluorescence (NRF). A non-destructive inspection of Special Nuclear Materials hidden in a container cargo using NRF is proposed by Bertozzi*. Non-destructive detection of Pu inside of a spent nuclear fuel rod is also proposed for management of radioactive wastes, nuclear material accounting and safeguards**. We have developed 2D NRF imaging by using quasi-monochromatic gamma-ray beam in MeV energy region generated by Laser Compton Backscattering (LCS) method*** and proposed to develop an NRF-CT image in the ELI-NP where a high intensity LCS beam can be available in near future. To demonstrate and finalize the measurement system of the NRF-CT imaging by using LCS gamma-ray beam, we have started a study on NRF-CT imaging at the new LCS beamline in UVSOR. The LCS beamline can generate 5.4 MeV LCS gamma-rays with a flux of 1×107 photons/s. We have measured the 5.291 MeV NRF gamma-rays from a lead target in this beamline and tried to take a NRF-CT image.
* W. Bertozzi et al., Nucl. Inst. Meth. B241, 820-825 (2005).
** B. Ludewigt et al., Proc. of 2010 ANS meeting (2010).
*** H. Toyokawa et al., JJAP, 50, 100209 (2011). 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY046  
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