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Your search keyword '"Hayashi, Kenji"' showing total 2 results
Start Over Author "Hayashi, Kenji" Publisher american institute of physics
2 results on '"Hayashi, Kenji"'

1. SAMRAI: A novel variably polarized angle-resolved photoemission beamline in the VUV region at UVSOR-II

Author

Kimura, Shin-Ichi, Ito, Takahiro, Sakai, Masahiro, Nakamura, Eiken, Kondo, Naonori, Horigome, Toshio, Hayashi, Kenji, Hosaka, Masahito, Katoh, Masahiro, Goto, Tomohiro, Ejima, Takeo, and Soda, Kazuo

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics
Abstract

A novel variably polarized angle-resolved photoemission spectroscopy beamline in the vacuum-ultraviolet (VUV) region has been installed at the UVSOR-II 750 MeV synchrotron light source. The beamline is equipped with a 3 m long APPLE-II type undulator with horizontally/vertically linear and right/left circular polarizations, a 10 m Wadsworth type monochromator covering a photon energy range of 6–43 eV, and a 200 mm radius hemispherical photoelectron analyzer with an electron lens of a ±18° acceptance angle. Due to the low emittance of the UVSOR-II storage ring, the light source is regarded as an entrance slit, and the undulator light is directly led to a grating by two plane mirrors in the monochromator while maintaining a balance between high-energy resolution and high photon flux. The energy resolving power (hν/Δhν) and photon flux of the monochromator are typically 1×10^4 and 10^12 photons/s, respectively, with a 100 μm exit slit. The beamline is used for angle-resolved photoemission spectroscopy with an energy resolution of a few meV covering the UV-to-VUV energy range.

Published
2010

2. Full Energy Injection and Top-up Operation at UVSOR-II.

Author

Katoh, Masahiro, Adachi, Masahiro, Zen, Heishun, Yamazaki, Jun-ichiro, Hayashi, Kenji, Mochihashi, Akira, Shimada, Miho, and Hosaka, Masahito

Subjects
ELECTRON beams, FREE electron lasers, PARTICLES (Nuclear physics), NUCLEAR physics, ELECTRONS
Abstract

Top-up operation was successfully demonstrated at UVSOR-II, which will remove the short beam-lifetime problem caused by strong Touschek effect due to the small emittance, 27 nm-rad, and the low electron energy, 750 MeV. In these years, we have improved the accelerators, step by step, towards top-up operation. The radiation shielding wall was reconstructed. The energy of the booster synchrotron and the beam transport line were successfully upgraded from 600 MeV to 750 MeV, by replacing the magnet power supplies in 2006. Soon after, we succeeded in injecting the electron beam at the full energy. We improved the radiation safety system and constructed a injection control system. In autumn, 2008, we succeeded in operating the ring for 12 hours as keeping the beam current quasi-constant at 300 mA. Currently, we operated the ring in the top-up mode for 12 hours on every Thursday night, to check the effects on the users’ experiments. In 2009, we have succeeded in the top-up operation in single bunch mode. Free electron laser oscillation with the top-up mode was also successfully demonstrated. [ABSTRACT FROM AUTHOR]

Published
2010
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