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WEPMY039 |
Time Response Measurements for Transmission-Type GaAs/GaAsP Superlattice Photocathodes |
2641 |
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- N. Yamamoto, X.J. Jin
KEK, Ibaraki, Japan
- M. Hosaka, Y. Takashima, K. Yamaguchi
Nagoya University, Nagoya, Japan
- M. Katoh
UVSOR, Okazaki, Japan
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Polarized electron beam is essential for future electron-positron colliders and electron-ion colliders. 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 this study, to compare the time response performances with the SL thicknesses, the measurements were carried out for conventional and strain compensated SL PCs. We show the measurement results and discuss the physics.
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DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-WEPMY039
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WEPOW023 |
Present Status of Accelerators in Aichi Synchrotron Radiation Center |
2877 |
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- Y. Takashima, M. Hosaka, A. Mano
Nagoya University, Nagoya, Japan
- Y. Hori, N. Yamamoto
KEK, Ibaraki, Japan
- M. Katoh
UVSOR, Okazaki, Japan
- S. Koda
SAGA, Tosu, Japan
- S. Sasaki
JASRI/SPring-8, Hyogo, Japan
- T. Takano
Hitachi Ltd., Ibaraki-ken, Japan
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Aichi Synchrotron Radiation Center is the newest synchrotron radiation facility in Japan. The construction was started in 2010 and the facility was opened for public use on March 26, 2013. The circumference of the storage ring is 72 m with the electron energy of 1.2 GeV, the beam current of 300 mA and the natural emittance of about 53 nmrad. The beam is injected from a booster synchrotron with the energy of 1.2 GeV as full energy injection and the top-up operation has been carried out routinely with stored current of 300 mA since opened for public use. We have tested a pulsed multi-pole magnet for improving the deviation of the orbit of stored beam during the top-up beam injection. The storage ring consists of four triple bend cells. Eight of the twelve bending magnets are normal conducting ones. Four of them are 5 T superconducting magnets(superbend) of which bending angle is 12 degrees. The superbends are running without any trouble with refrigerator maintenance once per year. The accelerators have been operated about 1400 hours stable in a year. Eight of the synchrotron radiation beamlines have been operational for public use and other two beamlines are under construction.
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DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-WEPOW023
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Export • |
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※ LaTeX,
※ Text/Word,
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