Author: Takashima, Y.
Paper Title Page
TUPJE004 Narrow Band Coherent Edge Radiation at UVSOR-III 1613
 
  • M. Hosaka, O. Oodake, Y. Takashima, N. Yamamoto
    Nagoya University, Nagoya, Japan
  • S. Bielawski, C. Szwaj
    PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
  • M. Katoh, T. Konomi, J. Yamazaki
    UVSOR, Okazaki, Japan
  • H. Zen
    Kyoto University, Kyoto, Japan
  
  Edge radiation can be an interesting new light source because of its property that the radiation is well collimated and is radially polarized. We are developing coherent light sources in the THz region at UVSOR-III storage ring. We have already succeeded in producing a narrow band coherent THz radiation by manipulating the interaction of a relativistic electron bunch with an amplitude modulated laser with. Recently a simplified tentative beamline for detection of the edge radiation is installed at downstream of a short straight section of UVSOR-III. Coherent radiation from electron bunches after the interaction with the amplitude modulated laser is observed. Detailed measurements of polarizations and special distribution of the radiation are underway. The latest status of the study will be reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE004  
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TUPJE005 Development of Pulsed Multipole Magnet for Aichi SR Storage Ring 1616
 
  • K. Ito, M. Hosaka, A. Mano, T. Takano, Y. Takashima
    Nagoya University, Nagoya, Japan
  • K. Hayashi, M. Katoh
    UVSOR, Okazaki, Japan
  • N. Yamamoto
    KEK, Ibaraki, Japan
  
  The Aichi synchrotron radiation (Aichi SR) center is an industrial oriented synchrotron light source facility. The electron energy and circumference of the storage ring are 1.2 GeV and 72 m. The natural emittance is 53 nm-rad. Since the pulsed multipole injection scheme provides great advantages for relatively smaller SR rings*, we are developing a pulsed multipole injection system for Aichi SR storage ring. In this system, it is essential to minimize the perturbation to the stored beam. To realize the required performances, we have to minimize the residual field at stored beam position, taken into account the field generated by the copper current lead of the input terminal. In addition, we carried out the analytical calculation to estimate the magnet field due to the current lead and optimized the geometrical structure of them. Construction of the multipole magnet will be completed in March 2015 and the field measurement will be carried out in April. In this presentation, we report the detail of the magnet design and the measurement results of pulsed magnetic field for the manufactured magnet.
* N. Yamamoto, et. al., NIM A 767, 26-33 (2014) 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE005  
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TUPJE006 Recent Developments of UVSOR-III 1619
 
  • M. Katoh, K. Hayashi, J. Yamazaki
    UVSOR, Okazaki, Japan
  • M. Adachi, T. Konomi, N. Yamamoto
    KEK, Ibaraki, Japan
  • M. Hosaka, Y. Takashima
    Nagoya University, Nagoya, Japan
  
  A 750 MeV low energy synchrotron light source, UVSOR, has been operational since 1983. About ten years after the first major upgrade in 2003, the second major upgrade was carried out in 2012, in which all the bending magnets were replaced with combined function ones and a new in-vacuum undulator was installed in the last straight section reserved for undulators. After this upgrade, the light source, UVSOR-III, has been operational with small emittance of 17 nm-rad, with six undulators, and fully with the top-up injection at 300mA. Adding to the present status of the accelerator, most recent progresses in the pulsed sextupole magnet for the beam injection and in the coherent light source development station will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE006  
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WEAD3 Quantum Efficiency Improvement of Polarized Electron Source using Strain Compensated Super Lattice Photocathode 2479
 
  • N. Yamamoto, M. Hosaka, A. Mano, T. Miyauchi, Y. Takashima, Y. Takeda
    Nagoya University, Nagoya, Japan
  • X.J. Jin, M. Yamamoto
    KEK, Ibaraki, Japan
  
  Polarized electron beam is essential for future electron-positron colliders and electron-ion colliders. Improving the quantum efficiency is an important subject to realize those proposed applications. Recently we have developed the strain compensated superlattice (SL) photocathode. In the strain compensated SLs, the equivalent compressive and tensile strains introduced in the well and barrier SL layers so that strain relaxation is effectively suppressed with increasing the SL layer thickness and high crystal quality can be expected. In this study, we fabricated the GaAs/GaAsP strain compensated SLs with the thickness up to 90-pair SL layers. Up to now, the electron spin polarization of 92 % and the quantum efficiency of 1.6 % were simultaneously achieved from 24-pair sample. In the presentation, we show the effect of the superlattice thickness on the photocathode performances and discuss the photocathode physics.  
slides icon Slides WEAD3 [3.064 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEAD3  
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