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Your search keyword '"Tanaka, Hitoshi"' showing total 2 results
Start Over Author "Tanaka, Hitoshi" Topic electromagnetic waves Topic synchrotron radiation
2 results on '"Tanaka, Hitoshi"'

1. Current Status of the SPring-8 Upgrade Project.

Author

Tanaka, Hitoshi

Subjects
*LATTICE dynamics, *ELECTROMAGNETIC waves, *MAGNETIC dipoles, *SYNCHROTRON radiation, *X-ray reflection, *PARTICLES (Nuclear physics), *SPECTRUM analysis
Abstract

For many years, scientists around the world have sought an ultra-low-emittance ring-based light source that offers greater performance than existing third-generation light sources. Pioneering work on the seven-bend lattice for MAX IV [1] initiated these efforts. Another significant development was the scheme for nonlinearity control based on “phase-matched” sextupole pairs. This configuration, first introduced in a light source design by the ESRF design group [2], efficiently suppresses strong nonlinear resonances induced by sextupoles for chromaticity correction. Since a small dynamic aperture due to the strong nonlinearities mentioned earlier presents a great obstacle when we attempt to lower the beam emittance of a high-energy light source using individual bending magnets with small deflection angles, the ESRF scheme contributes significantly to the emittance reduction that can be practically achieved. [ABSTRACT FROM PUBLISHER]

Published
2014
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2. High-Precision Time Delay Control with Continuous Phase Shifter for Pump-Probe Experiments Using Synchrotron Radiation Pulses.

Author

Tanaka, Yoshihito, Ohshima, Takashi, Fukuyama, Yoshimitsu, Yasuda, Nobuhiro, Kim, Jungeun, Osawa, Hitoshi, Kimura, Shigeru, Togashi, Tadashi, Hara, Toru, Kamioka, Hayato, Moritomo, Yutaka, Tanaka, Hitoshi, Takata, Masaki, Sengoku, Hidetoshi, and Nonoshita, Eiji

Subjects
*SYNCHROTRON radiation, *TIME delay systems, *ELECTROMAGNETIC waves, *SYNCHROTRON radiation sources, *FREE electron lasers, *OPTICAL diffraction
Abstract

Brilliant pulsed x-ray synchrotron radiation (SR) is useful for pump-probe experiment such as time-resolved x-ray diffraction, x-ray absorption fine structure, and x-ray spectroscopy. For laser pump-SR x-ray probe experiments, short pulsed lasers are generally synchronized to the SR master oscillator controlling the voltage for acceleration of electron bunches in an accelerator, and the interval between the laser and the SR pulses is changed around the time scale of target phenomenon. Ideal delay control produces any time delay as keeping the time-precision and pointing-stability of optical pulses at a sample position. We constructed the time delay control module using a continuous phase shifter of radio frequency signal and a frequency divider, which can produce the delayed trigger pulses to the laser without degradation of the time precision and the pointing stability. A picoseconds time-resolved x-ray diffraction experiment was demonstrated at SPring-8 storage ring for fast lattice response by femtosecond pulsed laser irradiation, and suggested the possibility of accurate sound velocity measurement. A delay control unit operating with subpicosecond precision has also been designed for femtosecond pump-probe experiments using a free electron laser at SPring-8 campus. [ABSTRACT FROM AUTHOR]

Published
2010
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