Curriculum Vitaes
Profile Information
- Affiliation
- Faculty of Engineering Department of Electronics,Information and Communication Engineering, Osaka Sangyo University非常勤研究員, 先端科学技術推進機構, 関西大学
- Degree
- 工学博士(大阪大学)
- J-GLOBAL ID
- 200901048491348799
- researchmap Member ID
- 1000107904
Research History
4-
Apr, 2017 - Mar, 2019
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Apr, 2014 - Mar, 2017
Education
4Committee Memberships
9-
1993 - Present
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Mar, 2009 - Sep, 2018
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Sep, 2008 - Aug, 2010
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- 2010
Papers
57-
J.Ceramic Soc.Jpn., 121(8) 714-722, 2013 Peer-reviewed
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Terahertz Sci. Tech., 6(3) 189-205, 2013 Peer-reviewed
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Nucl.Instr.Meth, A674 20-23, 2012 Peer-reviewed
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Jpn.J.Appl.Phys., 51 028002-1-~2, 2012 Peer-reviewed
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Appl.Phys.Lett., 100 191101-1-~2, 2012 Peer-reviewed
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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 637(1) 135-137, May, 2011 Peer-reviewedSmith-Purcell radiation from an electric line charge that moves, at constant speed, parallel to a grating made of metamaterial with negative index is analyzed. Through theoretical analysis and computations, we show that the Smith-Purcell radiation is stronger from a grating of negative-index material, than that from a positive-index material and perfect conductor. Also, we found that the radiation strongly depends on the values of permeability and permittivity. Calculations on grating with saw-like profile and rectangular profile are also carried out and demonstrated. (C) 2011 Elsevier B.V. All rights reserved.
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APPLIED PHYSICS LETTERS, 98(21) 211503-1-~3, May, 2011 Peer-reviewedGrating with Bragg reflectors for the Smith-Purcell free-electron laser is proposed to improve the reflection coefficient, resulting in enhancing the interaction of the surface wave with the electron beam and, consequently, relax the requirements to the electron beam. With the help of particle-in-cell simulations, it has been shown that the usage of Bragg reflectors may improve the growth rate, shorten the time for the device to reach saturation, and lower the start current for the operation of a Smith-Purcell free-electron laser. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3594243]
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Phosphrous Research Bulletin, 25 64-67, 2011 Peer-reviewedHardening of β-tricalcium phosphate (β-TCP) mixed with a 2.5wt% Na2HPO4 aqueous solution was investigated by a compressive strength test, XRD, SEM, and calorimetry. The β-TCP starting material was ground using a mortar grinder for 7, 24, and 72 h in an air atmosphere. Compressive strength for β-TCP cement ground for 24 h was stronger than that ground for 7 h and 72 h, and was 42.8±4.1 MPa after soaking in saline for 7 days. It was found that β-TCP requires rapid hydrolysis to harden β-TCP cement. The Na2HPO4 aqueous solution facilitates this hydrolysis reaction. The compressive strength of β-TCP cement depends on the length and the number of acicular apatite crystals deposited from β-TCP.
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JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, 31(11) 1271-1277, Nov, 2010 Peer-reviewedA two-section grating system for Smith-Purcell free-electron lasers is investigated. The system is composed of two open gratings with different geometrical parameters. It is expected that the originally continuous electron beam is bunched in the first section by interaction with the evanescent wave near the grating surface, and enhanced radiation can be extracted at the second section in the form of super-radiant Smith-Purcell radiation at a designed angle. With the help of particle-in-cell simulation, the electron beam bunching and directed output of the fundamental radiation and higher order harmonics are demonstrated.
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rle, 28(9) 609-612, Sep, 2000 Peer-reviewedA test hybrid helical microwiggler with 4 poles per period has been designed and developed with parameters such as period of 10 mm, gap diameter of 5 mm and periodical number of 10. One period of its wiggler is constructed with four segments. Each of them has a thickness of 2.5 mm and consists of pentagonal permanent magnets and permendurs as ferromagnets. Each segment is stacked along wiggler axis rotating byangle of 90°C It is so small that the outer width is 72 mm. The measured peak field is 0.35 to 0.4 T depending on the gap space of 5.2 to 4.8 mm.
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The Review of laser engineering, 28(6) 370-373, Jun, 2000 Peer-reviewed
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rle, 26(9) 696-699, Sep, 1998 Peer-reviewedWe have investigated the Compton scattering of an intense laser beam confined to the supercavity for a highenergy and high-bright photon source. To generate the scattered photons in high efficiency, it is necessary to collide high-density electrons with high-density photons. Therefore, the laser light and the electron beam should be focused as small as possible to get intense radiation. But the focused laser beam and electron beam cannot overlap with each other completely. Here we describe a method for an electron beam and laser beam to interact under optimal conditions in a realistic case. Using this method, we can estimate the flux of γ-ray 1012 photons/sec for a conventional laser with a supercavity and typical electron storage ring.
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rle, 26(5) 390-394, May, 1998 Peer-reviewedWe have started to develop a tungsten (W) field emission cathode for Cherenkov free electron laser (FEL) or Smith-Percell FEL. In this work, elementary properties of electron beam current from W tip have been investigated by numerical simulation and experiment using a system consisting of W tip, 1 st- and 2nd- gate, and anode. When there was no 2nd gate, the current increased up to-20μA with the absolute voltage of cathode according to the Fowler-Nordheim equation. The addition of 2nd gate decreased the current half to 5th lower than expected value from the simulation. However, it focused and enlarged the current of the electron beam in a certain voltage range of 2nd gate. These phenomena agreed qualitatively with those of the simulation. In further study, improved experiment will be made to get higher current and parallel smaller size of an electron beam.
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rle, 26(5) 386-389, May, 1998 Peer-reviewedIn order to get a short wavelength free electron laser (FEL), higher harmonic gain has been analyzed for an FEL using a hybrid planar wiggler with a period of 20 mm. This type wiggler consisting of ferromagnetics and permanent magnets is most convenient and gives the strong field including some higher harmonic components by selecting proper sizes of these magnetic materials. A certain modification of magnetic field distribution is accomplished by small gap length of the wiggler and small width of permendur as a ferromagnet. Gain analysis of FEL shows that higher harmonic gains exceed that of the fundamental for a very high magnetic field and suggests that for high wiggler field of K>1-1.6, higher harmonic gains are improved primarily dUe to its strong field and for low wiggler field of K<1-1.6, gain improvements are mainly due to the modification of the wiggler field distribution.
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rle, 26(5) 379-385, May, 1998 Peer-reviewedMagnetic field of a core type wiggler becomes obviously weaker with the decrease of its period due to increasing leakage field. Comparison of a core type helical wiggler with a planar wiggler suggests that the former has leakage field much smaller than the latter wiggler . It urged for us to develop two kinds of helical microwiggler aimed at following two points: (A) the period as short as possible, and (B) the structure ascompact as possible. The former was realized by three poles per period type electromagnetic structure . A peak field of 3.0 kG on axis was achieved with a period of 7.9 mm and gap length of 4.6 mm. The latter was studied by numerical simulation and a helical microwiggler with four poles per period was designed . It will give a wiggler field of 3.7 kG for the period of 10 mm and the gap length of 5 mm. If it is assumed that the K parameter of a wiggler needs 0.2 for FEL oscillation, its period becomes 8 mm for gap length of 5 mm or gap length is enlarged to 7 mm for the period of 10 mm.
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Journal of the Japan Society of Infraed Science and Technolog, 8(1) 45-52, 1998 Peer-reviewed
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rle, 21(7) 746-753, Jul, 1993 Peer-reviewedThe free-electron-laser experiment in the milli-meter-range by the coherent radiation emitted from an electron bunch is reported. With a 7MeV rf-linac, the spontaneous emission of 20W has been observed. The oscillation experiment has been performed by superimposing this radiation in the resonator. Power of 16W was observed at wavelength of 2.73mm.
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INFRARED PHYSICS, 25(4) 633-640, 1985 Peer-reviewed
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Rev. Laser Eng., 11(7) 509-513, Jul, 1983 Peer-reviewedA portable optically pumped far-infrared (FIR) waveguide laser having a modified Chang-type output coupling is constructed and its characteristics are studied by using a CH2F2lasant. The new output coupling is designed so that lasing wavelength from 10 μ m to a few millimeters can be observed. Reproducible and stable FIR laser output is observed, although the tuning curve is very complex due to the low-loss multimode oscillation.
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INFRARED PHYSICS, 22(4) 229-236, 1982 Peer-reviewed
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JOURNAL OF NON-CRYSTALLINE SOLIDS, 44(2-3) 369-378, 1981 Peer-reviewed
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Journal of Plasma and Fusion Research, 45(5) 476-498, 1981 Peer-reviewedA beat-modulated 118.8-μ m CH3OH laser interferometer system has been constructed and successfully operated for the electron density measurement of JIPP T-II plasma. A Michelson-type far-infrared (FIR) laser interferometer system with a corner-cube reflector has been adopted in order to compensate the mechanical vibration component of the system by means of a 632.8-nm He-Ne laser interferometer. The corner-cube reflector is directly attached to the JIPP T-II vacuum vessel because of simplicity of the interferometer system. It has been observed that the vibration component of the FIR laser interferometer is compensated completely and the electron density by the system agrees closely with the one by a 2-mm microwave interferometer system. The signal-to-noise ratios of the probe- and reference signals are 50 and 250, respectively. The minimum detectable line-averaged density of present system is 8 × 1011 cm-3 (that is, 1/40 fringes).
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JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 77 169-175, 1981 Peer-reviewed
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INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1(1) 57-76, 1980 Peer-reviewed
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J.Chem.Soc.FaradayTrans.II, 75 1277-1283, 1979 Peer-reviewed
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Phys.Chem.Glasses, 19(6) 141-143, 1978 Peer-reviewed
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J.Non-Cryst.Solids, 29(3) 347-356, 1978 Peer-reviewed
Misc.
254-
Proc. of 3rd Int Work. on Far Infrared Technologies, 5, 2010
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Proc. of 3rd Int Work. on Far Infrared Technologies, 5, 2010
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JAPANESE JOURNAL OF APPLIED PHYSICS, 48(11) 114504-1～8, Nov, 2009An adiabatic transition field in a solenoid-induced helical wiggler has been successfully generated using staggered Ni plates with different thicknesses of 6 to 0.1 mm. However, trials using Fe plates instead of Ni plates failed to generate a suitable adiabatic transition field To elucidate these phenomena, the magnetic behavior of Ni and Fe plates with regard to the thickness dependence was studied by a fundamental electromagnetic calculation with the aid of a field calculation based on the finite element method The magnetic flux density of a Ni plate increases and then decreases with the reduction in thickness from 6 to 0.8 mm and from 0 8 to 0 1 mm, respectively On the other hand. the magnetic flux density of an Fe plate does not have a maximum but monotonically increases until the smallest thickness of 0.1 mm. The dependence of magnetic flux density on thickness differs between Ni and Fe plates This difference explains the necessity of using a Ni plate for the adiabatic transition part of the wiggler. Furthermore, we estimated three types of demagnetizing factor depending on the thickness of the plate. (C) 2009 The Japan Society of Applied Physics
Books and Other Publications
16Works
15Research Projects
12-
科学研究費 基盤研究(C), Apr, 2012 - Mar, 2014
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科学研究費 基盤研究(C), Apr, 2010 - Mar, 2012
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倉田奨励金, 倉田記念日立科学技術財団, Apr, 2009 - Mar, 2010
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科学研究費 基盤研究(B), Apr, 2003 - Mar, 2007
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科学研究費 基盤研究(C), Apr, 2000 - Mar, 2003