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Iijima, Hokuto*; Nagai, Ryoji; Nishimori, Nobuyuki; Hajima, Ryoichi
Electrical Engineering in Japan, 177(3), p.46 - 53, 2011/11
Times Cited Count：0 Percentile：0(Engineering, Electrical & Electronic)A high-brightness electron source of ultrasmall emittance and high average current is one of the most important components for next-generation light sources based on an energy-recovery linac (ERL). Such a high-brightness electron source can be realized by a DC photocathode gun driven by laser pulses tailored in the temporal and spatial dimensions. We propose a novel photocathode based on a quantum cascade laser (QCL). Since the ultrafast response of photoelectron emission from QCL is compatible with the tailored laser pulses, it is a candidate electron source for ERLs.
Au with synchrotron radiationSowa, Makoto*; Yamazaki, Daichi*; Okada, Michio*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Toshio*
Electrical Engineering in Japan, 175(4), p.43 - 47, 2011/06
Times Cited Count：2 Percentile：18.47(Engineering, Electrical & Electronic)Teraoka, Yuden; Yoshigoe, Akitaka; Moritani, Kosuke*
Electrical Engineering in Japan, 164(3), p.60 - 68, 2008/08
Times Cited Count：3 Percentile：26.08(Engineering, Electrical & Electronic)Oxidation reactions at Si(001) surfaces have been studied via real-time in-situ photoemission spectroscopy with synchrotron radiation for chemical bonding states of Si and O atoms and mass spectrometry for desorption of SiO molecules with supersonic O
molecular beams in a temperature region from 900 K to 1300 K. In this study, simultaneous measurements of Si 2p photoemission spectra and SiO desorption yield revealed that the decrease of SiO correlated with the increase of Si
component, and the SiO desorption was terminated at the oxide thickness of 0.22 nm. These facts suggest that the SiO desorption takes place at the topmost Si dimers and a precursor for SiO desorption is so called a T site, in which O atoms are bonding with the dangling bonds of the dimers. Consequently, M1 and M2 in the Dual-Oxide-Species (DOS) model has been clarified to be a T site and an Si state, respectively.
Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Imai, Tsuyoshi*; Sakamoto, Keishi
Electrical Engineering in Japan, 161(2), p.1 - 7, 2007/11
Times Cited Count：1 Percentile：11.89(Engineering, Electrical & Electronic)Experiments on microwave plasma generation and its application to microwave beamed energy propulsion were conducted using a 1 MW-class, 170 GHz gyrotron. The microwave beam was focused using a parabola reflector and plasma was initiated near the focal point in the ambient air. Plasma propagated upstream in the microwave beam channel while absorbing microwaves. Its propagation velocity was supersonic when the microwave power density was greater than 75 kW/cm
. The propulsive impulse was measured using a cone-cylinder shaped thruster model. As a result, the maximum momentum coupling coefficient was obtained at a certain plasma propagation distance. In addition, a larger momentum coupling coefficient was obtained when plasma was propagated at a supersonic velocity. This is because supersonic plasma propagation forms a strong shock wave, resulting in an efficient pressure increase.
Nakano, Hirotami*; Tanabe, Takeshi*; Naito, Masanobu*; Kubota, Yoshiki*; Morita, Tsuyoshi*; Kimura, Toyoaki; Matsukawa, Makoto; Miura, Yushi
Electrical Engineering in Japan, 131(4), p.1 - 10, 2000/04
Times Cited Count：8 Percentile：48.65(Engineering, Electrical & Electronic)no abstracts in English
