大気圧高電圧パルス放電により回収したリチウムイオン電池正極材活物質の分析と回収方法の検討
大﨑 亀太郎; 後藤 聡汰; 田中 正志; 柳平 丈志; 平山 智士; 乾 義尚, 電気学会
電気学会研究会資料. FTE = The papers of Technical Meeting on "Frontier Technology and Engineering", IEE Japan / 電気学会新エネルギー・環境研究会 [編], Sep. 2022

パルス沿面放電による排水処理が淡水の一次生産者 に及ぼす影響　　　　　　　　　　　　　　　
柳平丈志; 日吉泰貴, Lead, 電気学会
令和元年度 電気学会東京支部茨城支所研究発表会, 07 Dec. 2019

Proposal of novel degradation diagnosis method for photovoltaic module employing xenon flash lighting system and detector capacitor　　　　　　　　　　　　　　　
T. Tanaka; T. Hayashi; T. Nagayama; T. Yanagidaira; and Y. Inui, Elsevier Ltd.
Energy Conversion and Management, 2019, [Reviewed]

高電圧パルス沿面放電が従属栄養細菌の生菌数に及ぼす影響　　　　　　　　　　　　　　　
柳平丈志; 松林裕士, Lead, 電気学会
平成３０年度電気学会東京支部茨城支所研究発表会, 17 Nov. 2018

投げ込み式放電リアクタによる難分解性物質の分解と細菌数の変動　　　　　　　　　　　　　　　
松林 裕士; 柳平 丈志, Corresponding
Proc. 17th World Lake Conference, Lake Kasumigaura, Ibaraki, Japan 2018, 15 Oct. 2018, [Reviewed]

気液境界のパルス沿面放電が微生物の酸素消費に及ぼす影響　　　　　　　　　　　　　　　
柳平丈志; 松林裕士, Lead, 電気学会
平成 29 年度電気学会東京支部茨城支所研究発表会, Nov. 2017

IGBTレ グ と MOSFETレ グ を 備 え た オ ー ル メ タ ル 対 応 誘 導 加 熱 シ ス テ ム 用フルブリッジ・ハーフブリッジ切り替えインバータ　　　　　　　　　　　　　　　
庄司浩幸; 宇留野純平; 磯貝雅之; 柳平丈志, Last
電 学 論 D, Jul. 2016, [Reviewed]

Full-bridge/half-bridge switching inverter with IGBT Leg and MOSFET leg for all-metals induction heating systems
Hiroyuki Shoji; Junpei Uruno; Masayuki Isogai; Takeshi Yanagidaira, An induction heating system is proposed as a new circuit topology for induction heating cookers that can be used with all metals. This system has the mechanism to drive an IGBT and a MOSFET in parallel that switch the inverter between full-bridge or modified half-bridge configuration according to the cookware material. When cookware made of a low-resistivity material such as copper or aluminum is heated, the inverter is switched to the half-bridge configuration, which turns ofT the IGBT leg earlier than the MOSFET leg. When cookware made of a high-resistivity material such as iron or magnetic stainless steel is heated, the inverter is switched to the full-bridge configuration. We confirmed a turn-off timing for the IGBT where the loss of the switching element in the parallel drive was minimized by an experiment. The proposed inverter effectively improved the electricity conversion efficiency for all metals pan heating with the utilized IGBT and MOSFET legs., Institute of Electrical Engineers of Japan
IEEJ Transactions on Industry Applications, 2016, [Reviewed]

All-metals induction heating system with switching between full-bridge and half-bridge inverter configurations
Hiroyuki Shoji; Junpei Uruno; Masayuki Isogai; Takeshi Yanagidaira, An induction heating system is proposed as a new circuit topology for induction-heating cookers that can be used with all metals. This system has a fixed number of work coil turns that switch the inverter between full-bridge or modified half-bridge configuration according to the cookware material and power setting. When heating cookware made of a low-resistivity material such as copper or aluminum, the inverter is switched to the half-bridge configuration
when cookware made of a high-resistivity material such as iron or magnetic stainless steel is heated at high power, the inverter is switched to the full-bridge configuration. The buck converter, which is placed in the stage before the inverter, controls the DC link voltage to adjust the power. In addition, the boost converter placed in the stage before the buck converter is switched between passive filter and active filter modes to reduce the harmonics of the commercial input current and hence improve the power factor. Tests confirm the power conversion efficiency of the inverter and boost and buck converters as well as the power control characteristics of the inverter. High efficiency over a wide power range when heating an iron pan was also confirmed., Institute of Electrical Engineers of Japan
IEEJ Journal of Industry Applications, 2016, [Reviewed]

Buck-boost-full-bridge inverter for all-metals induction heating cookers
Hiroyuki Shoji; Junpei Uruno; Masayuki Isogai; Takeshi Yanagidaira, In this paper, we present a buck-boost-full-bridge (BBFB) inverter that is a novel circuit topology developed for all-metals induction heating cookers. A power device of a full bridge inverter serves as a part of the H-bridge PAM (Pulse Amplitude Modulation) converter, thus reducing the number of power devices. In iron pan heating, it consists of a buck converter stage and a full bridge inverter stage with a boost function. On the other hand, in aluminum pan heating, it completely becomes independent of the H-bridge PAMconverter stage and a single-ended push-pull (SEPP) inverter stage. For iron pan heating, the power conversion efficiency showed an approximately flat characteristic in a wide power range., Institute of Electrical Engineers of Japan
IEEJ Journal of Industry Applications, 2016, [Reviewed]

Modular Pulse Generator With Capability of Capacitive Energy Recovery
T. Yanagidaira; T. Kikuchi and K. Higashiyama, Lead, A repetitive high-voltage pulse generator, consisting of many modules capable of recovering capacitive energy at the pulse termination phase, was developed for use with a capacitive load. The module essentially consists of two capacitors, one for energy storage and the other for energy recovery, and two switches. The first switch delivers energy from the storage capacitor to the capacitive load in a pulse of variable width in the 100-ns range, and then the second switch transfers the residual charge on the capacitive load to the recovery capacitor. The experimental results for metal-oxide-semiconductor field-effect transistor-based modules rated at 600 V and 96 A are described. Using the six modules connected in parallel, pulses of width 600 ns and amplitude 10 kV were produced on a 50 Omega-100-pF load, and more than 50% of the capacitive energy was recovered., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Transactions on Plasma Science, Oct. 2013, [Reviewed]

ＭＯＳトランジスタのパルス駆動における電流分担の改善に関する研究　　　　　　　　　　　　　　　
髙木 元; 折原正人; 山田 務; 柳平丈志, Last
電気学会論文誌Ａ（基礎・材料・共通部門誌）, 2012, [Reviewed]

Spectroscopic Analysis of the Effect of Magnetic Field on Low Current DC Vacuum Arc Plasma
W.M.R.R.Wanninayake; K. Kobayashi; T. Yanagidaira and K. Tsuruta, Effects of a magnetic field on the characteristics of a low-current DC vacuum arc plasma of less than 30 A wet c examined by arranging the electrodes in a straight line or perpendicularly Two types of magnetic fields were applied to the :Nip by embedding a small column magnet inside the electrode and arranging a disc magnet at the back side of the electrode The arc plasma forms a column depending on the magnetic field distribution and an anode spot is generated under strong magnetic field on the anode side Spectroscopic analysis of emissions from cathode and anode showed that the cathode metal ions arrive at the anode and the anode metal ions arrive at the cathode along the magnetic field. but neurals arc not guided by the magnetic field and only a small part of the neutrals arrive at the. opposite electrode in the perpendicular arrangement (C) 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons. Inc, WILEY
IEEJ Transactions on Electrical and Electronic Engineering, 01 May 2010, [Reviewed]

小型伝送線路トランスの使用による高繰り返しパルス発生回路　　　　　　　　　　　　　　　
中野恵介; 矢吹隆雄; 高木 元; 王 爽; 柳平丈志; 鶴田浩一
電気学会論文誌Ａ, Sep. 2009, [Reviewed]

ＭＯＳトランジスタの直列運転のための磁気的な連鎖結合によるゲート駆動回路
海野聡平; 金高 崇; 岩瀬千克; 柳平丈志; 鶴田浩一, Gate driving circuit by magnetic chain mechanism for series operation of field effect transistors was developed. Serial connection of field effect transistors was employed to generate pulses of high voltage and a short rise time. The whole circuit is divided into many cells containing a transistor and an associated gate driving circuit, and the cells are magnetically triggered successively by applying an external trigger pulse on the first cell. The switching characteristics of the cells were investigated at voltages up to 5 kV, and the rise time of the output voltage was 22 ns at 500Ωload., The Institute of Electrical Engineers of Japan
電気学会論文誌Ａ, Apr. 2009, [Reviewed]

Generation of Anode Spot in Low-Current DC Vacuum Arcs by the Effect of Embedded Magnet in the Anode
Kazuki Kobayashi; W.M.R.R. Wanninayake; Takeshi Yanagidaira; Naoyuki Sato and Koichi Tsuruta, Experiments were conducted with the aim of keeping low-current DC vacuum arcs stable. A permanent columnar magnet was embedded in the anode and a permanent disk-shaped magnet was arranged behind the anode. As result, the arc plasma is strongly constricted to a column and a light emitting point appeared on the anode surface. Generation of the anode spot was confirmed by detecting anode metal vapor and ions using mass and spectroscopic analyses under low-current arcs of less than 20 A. (C) 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc., WILEY
Transactions on Electrical and Electronic Engineering, Mar. 2008, [Reviewed]

Effect of Magnetic Field on the Behavior and Sustaining Characteristics of Low-Current DC Vacuum Arc
Kengo Yanagi; Satoru Shibata; Takeshi Yanagidaira and Koichi Tsuruta, Effects of magnetic field on duration and dynamics of low-current DC vacuum arcs, less than 20 A, were examined. Without a magnetic field, the cathode spot moves at random on the cathode surface and the arc voltage is constant for increasing gap length up to 30 mm. In the axial magnetic field. the arc plasma was constricted and the arc voltage rose with increasing gap length. When a magnet was arranged behind the cathode, the cathode spot rotated in the opposite direction of the Lorentz force (j x B) on the edge of the cathode. On the other hand, when a magnet was arranged behind the anode, the arc column was constricted on the electrode axis and the lifetime of the arcs was extremely extended. (c) 2007 Wiley Periodicals, Inc., SCRIPTA TECHNICA-JOHN WILEY & SONS
Electrical Engineering in Japan, Oct. 2007

Effect of Axially Symmetric Magnetic Fields for Dynamics of Low-Current DC Vacuum Arc Plasma
Koichi Tsuruta; Kengo Yanagi; Satoru Shibata; Takeshi Yanagidaira and Takashi Ikehata, In this paper, effects of four types of axially symmetric magnetic fields on the dynamics of low-current de vacuum arc plasma, which is less than 30 A, were examined. Arcs were ignited by the opening of the butt contacts made of zinc. In the axial magnetic field, the arc plasma was restricted within a column, and the arc voltage rose with increasing gap length. When a magnet was arranged behind the cathode, the cathode spot rotated in the opposite direction to the Lorentz force (-J x B) on the edge of the circular-rod cathode. On the other hand, when a magnet was arranged behind the anode, the arc plasma was constricted on the anode side, and the lifetimes of the arcs became longer, although the arc voltage rose with increasing gap length. The compression effect of the axial component of the magnetic field was analyzed by introducing a simple magnetic piston model, and the experimental diameters of the arc column showed a good agreement with the model., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Transactions on Plasma Science, Aug. 2007, [Reviewed]

高速電流スイッチングによる接点アークの抑制
小川昇吾; 柳平丈志; 鶴田浩一, A high-speed switching assist equipment for suppression of arc discharge between contact electrodes was developed. It is consisted of arc detection circuit, semiconductor switch, and energy absorbing circuit. By adjusting the operation delay time to a short time less than 1 ms, electrode damage and optical emission was reduced., The Institute of Electrical Engineers of Japan
電気学会論文誌Ａ, 01 Jul. 2006, [Reviewed]

小電流ＤＣ真空アークの挙動と維持特性に及ぼす磁界の効果
柳 健吾; 柴田 智; 柳平丈志; 鶴田浩一, Effect of magnetic field on sustainment and dynamics of low current DC vacuum arcs, less than 20 A, were examined. Without magnetic field, the cathode spot moves at random on the cathode surface and the arc voltage is constant for increasing gap length up to 30 mm. In the axial magnetic field, the arc plasma was constricted and the arc voltage rose with increasing gap length. When a magnet was arranged behind the cathode, the cathode spot rotated in the opposite direction of the Lorentz force (J x B) on the edge of the cathode. On the other hand, when a magnet was arranged behind the anode, the arc column was constricted on the electrode axis and the lifetime of the arcs was extremely extended., The Institute of Electrical Engineers of Japan
電気学会論文誌Ａ, 01 Jul. 2006

Temporal Evolution of Micro-Plasma in a Low-Current, Repetitive Vacuum Spark Soft X-Ray Source
Yanagidaira; T. Kotake; W. Miura; H. Tsuruta; K., Lead, Temporal evolution of micro-plasma and soft X-ray emission in a short vacuum gap, operated with a repetitive low-current (similar to 100 A) discharge was investigated. The device consists of two resonant circuits having different resonant frequencies for energy storage. Micro-plasma of diameter less than 1 mm is formed during spark phase with a very high-frequency (VHF) voltage, and electrodes are heated by successive high-frequency (HF) current. Thermo-field electrons are accelerated by an electric field in a cathode sheath that is formed after arc extinction. Soft X-rays were emitted mainly in the period between arc extinction and subsequent breakdown., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Transactions on Plasma Science, 17 Oct. 2005

Soft x-ray generation after arc extinction of a short vacuum gap operated with low-current, repetitive discharge
Takeshi Yanagidaira; Daiji Nose; Hiroshi Abiko; Hiromichi Miura and Koichi Tsuruta, Lead, Soft x-ray emission from a short vacuum gap, operated with a repetitive low-current arc with a period of similar to2 its and peak current of 200 A, was investigated. Electrons are accelerated by an electric field in the cathode sheath that is formed after arc extinction, and soft x-rays were emitted in the period between arc extinction and subsequent breakdown. The bulk of the radiation was detected in the 1-3 keV soft x-ray range when a tungsten anode was employed. The dimension of the point-like x-ray source in the radial direction was less than 170 mum. The current density at the time of x-ray emission was similar to10(7) A m(-2)., IOP PUBLISHING LTD
Plasma Sources Sci. Technol., 2004

真空インパルスアークプラズマを対象とするＴＯＦ法の検討
真部泰幸; 柳平丈志; 鶴田浩一, Time of flight method in the form of ion acceleration by a negative square pulse is investigated for lead ion plasma generated from a short burning time impulse vacuum arc. In the method, lead ions existing between the grid with earth potential and the accelerating grid which is connected to the ion accelerating tube are accelerated into the tube by applying a negative square pulse voltage to the accelerating grid. The ions fly toward the ion collector with a constant velocity dependent on the charge state. The effect of an axial magnetic field in the accelerating tube on the loss of the flying ions and on the obtained rate of the densities of Pb⁺¹ and Pb⁺² ions in the arc plasma is discussed. The relation between the amount of the accelerated ions and the accelerating voltage is also investigated from the viewpoint of time dependent propagation of the ion sheath, which is formed in front of the accelerating grid., The Institute of Electrical Engineers of Japan
電気学会論文誌Ａ, May 2003

真空アーク亜鉛イオンの同位体分布とエネルギー分布
鶴田浩一; 城戸寛子; 田中徳幸; 柳平丈志
電気学会論文誌Ａ, Nov. 2001

直流真空アークプラズマ金属イオンの価数分布とエネルギー分布
田中 徳幸; 柳平 丈志; 鶴田 浩一
電気学会研究会資料. ED, 放電研究会, 26 Oct. 2001, [Reviewed]

Ignition and Instability of Low Current DC Vacuum Arcs ignited by the Opening of the Electrodes
K. Tsuruta; N. Tanaka; H. Kido; K. Hirai and T. Yanagidaira, The ignition, lifetime, and instability of low-current de vacuum arcs, which were ignited by the opening of the electrodes, were investigated experimentally. Copper electrodes were used and the are current was less than 50 A. Waveforms of the voltage and current between the electrodes at the moment of are ignition and during the are continuation were measured. It was confirmed that, for the ignition of the are, a voltage which was larger than a critical value should appear between the electrodes at the moment of the opening of the electrodes. The lifetime of the arc is short, less than 1 s in the present condition, and increases with an increase in arc current and output voltage of the current source. The arc voltage consists of a certain dc level, around 20 V, and an additive high-frequency component. The arc current consists of a certain dc level and a subtractive high-frequency component., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE Trans. Plasma Sci., Oct. 2001

An imaging spectrometer with a convex crystal for pulsed x rays in plasma experiments (共著)
T Yanagidaira; K Shimoda; Y Ono; K Hirano, Lead, An imaging spectrometer with a convex rubidium acid phthalate (RbAP) crystal is designed and examined. Using the ray tracing technique based on the kinematical theory of diffraction, resolution power, dispersion, linearity, spatial resolution and dynamic range of the monochromatic image are discussed. Broadening by a rocking curve is also taken into account. Performance of the spectrometer is successfully examined using the so-called hot spots as the soft x-ray source which are generated in the pinched plasma by the plasma focus facility with an additional gas puff. (C) 2000 American Institute of Physics. [S0034-6748(00)01201-6]., AMER INST PHYSICS
Review of Scientific Instruments, 2000

Quantitative measurement of X-ray images with a gated microchannel plate system in a z-pinch plasma experiment (共著)
B Shan; T Yanagidaira; K Shimoda; K Hirano, A multiframe, gated pinhole system capable of quantitative acquisition for pulsed soft x rays is described and tested. The system based on a gated microchannel plate (MCP) is employed to observe the evolution of z-pinch plasma in a plasma focus facility with a time resolution of similar to 220 ps. The quantitative relationship between x-ray source intensity and the recorded images has been investigated. To make a quantitative measurement, the phosphor screen current was measured to calculate the total electrons output from the MCP, which is proportional to both the incident x-ray intensity and the intensity of the recorded images. Furthermore, by taking into account the pinhole geometry, MCP gain and system spectral response, a quantitative calibration of the x-ray images has been established. We have employed the system to observe the plasma evolution in a plasma focus facility. An order of similar to 10(16) photons/(s mm(2) mrad(2)) soft x-ray emission within 6-14 Angstrom was observed in a neon puffed experiment with time resolved four successive frames. (C) 1999 American Institute of Physics. [S0034-6748(99)00603-6]., AMER INST PHYSICS
Review of Scientific Instruments, 1999

Spectroscopic Study of Soft X-Ray Sources Generated in a Plasma Focus with Neon Gas Puffing (共著)
T Yanagidaira; T Yamamoto; K Hirano, Soft X-ray emitting spots (hot spots) generated in a plasma focus with a gas puffing are investigated using a streak mode imaging system for the soft X-ray region and a convex Bragg spectrometer which enables time resolved measurement. Using the imaging system, the typical size and lifetime of the hot spots in the focused neon plasma were measured to be similar to 1 mm in diameter, 13 mm in length and with a 5 similar to 8 ns lifetime, approximately. The full width at half-maximum of the duration of the NeX (12.19 Angstrom) 1s-2p and NeIX (13.447 Angstrom) 1s(2)-1s2p lines measured with the spectrometer agree with that measured with the imaging system. The soft X-ray emission started in the latter half of the plasma sustaining time measured by visible streak image and extinguished almost at the same time as the visible image. In the case of neon plasma; generation of the soft X-rays is not ascribed to the disruption of the plasma column, but to the growth of the macroscopic instabilities in the plasma column. After the disruption, the soft X-rays are not observed at all. The electron temperature and the density of the hot spots were estimated by several methods giving similar to 0.5 keV and in order of 10(21)/cm(3), respectively., PHYSICAL SOC JAPAN
Journal of the Physical Society of Japan, 1999

Spectroscopic Investigation of Z-Pinch with a Spatial and Temporal Resolution (共著)
T Yanagidaira; T Yamamoto; B Shan; K Hirano, Soft X-rays generated by a plasma focus device with an Ar gas puff are studied using a composite system which consists of an imaging Bragg spectrometer and a soft X-ray high speed imaging system. Two modes of soft X-ray emitting sources in Z-pinch plasma, filamentary and scattered spots, are generated in this experiment depending on the delay time from the gas puff to the main discharge. Spectroscopic observation revealed that even the case of the filamentary mode is not really filamentary but is actually X-ray emitting spots (hot spots) densely arranged in a column along the electrode axis. By using the soft X-ray high speed imaging system, the streak mode display is restructured from the data obtained in a single shot, Temporally resolved observations in streak mode showed that a spot appeared at a point near the electrode face first, then different hot spots appeared successively along the axis and in a direction away from the electrode face. It is clarified that the hot spot is a small region from which intense H-like and He-like spectral lines are emitted. The size and the distance between spots are from 0.1 to 0.5 mm in radius and similar to 0.5 mm in length, respectively. The lifetime of the spots is 5 similar to 10 ns. The average electron temperature and density calculated from the intensity ratio of those spectral lines are similar to 1.8 keV and 1.7 x 10(22) /cm(3), respectively. They did not show a notable change along the axis., PHYSICAL SOC JAPAN
Journal of the Physical Society of Japan, 1999

A Gated, Four-frame Pinhole Camera with Quantitative Image Acquisition (共著)
B Shan; T Yanagidaira; K Shimoda, A gated, multiframe microchannel plate soft X-ray sensor with quantitative acquisition has been developed. The system is composed of an image acquisition system and a gated pinhole camera capable of taking four successive frames at a time resolution of similar to 220 ps. The response of the system has been quantitatively investigated. To perform a quantitative evaluation of the captured X-ray images, the image acquisition and measurement of the phosphor current are executed simultaneously in the experiment. The system has been examined using a plasma X-ray source generated by a plasma focus device with an additional gas puff. The compression and bifurcation process of plasma hot spots in a neon puffed experiment has been successfully recorded. Quantitative analysis of the images indicates that an order of 10(16) photons/(s.mm(2).mrad(2)) emissions originate from the plasma in a soft X-ray region 6-14 Angstrom., JAPAN J APPLIED PHYSICS
Japanese Journal of Applied Physics, 1999

Soft x-ray emission in the neon gas puff plasma focus(共著)
T Yanagidaira; K Shimoda; Y Ono; K Hirano, Correlation between soft x-ray emission and dynamic plasma behavior is discussed for a plasma focus device with injected neon. Intense H-like and He-like lines from neon are radiated during an interval when the plasma appears from a visible-light streak camera to be stable. However, data from a multiframing soft x-ray camera indicate the growth of m=0 macroscopic instabilities during this period. The peak of the soft x-ray signal coincides with the micropinch generated in the plasma column, and the emission ends simultaneously with the extinction of the visible light. The electron temperature and density, which are obtained from spectroscopic analysis, are similar to 0.5 keV and similar to 10(22) cm(-3), respectively. (C) 1999 American Institute of Physics. [S1070-664X(99)01912-6]., AMER INST PHYSICS
Physics of plasmas, 1999

An image converting system in framing and streak mode for impulsive soft x-ray observation(共著)
T Yanagidaira; K Hirano, Lead, A high-speed image converting system is described. The system is capable of display both in multiframing- and streak-mode image for a pulsed x-ray source. The system relies on a new concept without employing an image converter tube. To achieve both temporally and spatially resolved display, the image of the x-ray source is acquired with a pinhole camera and with multichannel arrayed scintillator-photomultiplier combinations, which are used complementarily. The temporal resolution is 3 ns. This system is successfully used to observe the time evolution of soft x-ray emissions around 4 Angstrom in plasma focus discharges with puffed Ar. (C) 1997 American Institute of Physics., AMER INST PHYSICS
Review of Scientific Instruments, 1997

A Streak Mode Soft X-ray Imaging System(共著)
T Yanagidaira; M Sato; K Hirano, Lead, A streak mode soft X-ray imaging system was newly developed. The system is composed of a combination of a six-channel scintillator-photomultiplier array and a pinhole camera. In this system, the pinhole camera was used to obtain the spatial distribution of the impulsive soft X-ray source quantitatively. Analog signals from the photomultiplier array were provided to obtain the time variation of the source intensity. Software was developed to perform a streak mode display consisting of a 25x20 mesh (3.2 ns/div and 1 mm/div). This system has been successfully employed to observe the time evolution of X-ray emission in plasma focus discharges with puffed Ar. The lifetime and the intensity of the soft X-ray emitting spots around 4 Angstrom were found typically to be similar to 5 ns and similar to 10(16) photons/(mrad(2) . mm . s), respectively., JAPAN J APPLIED PHYSICS
Japanese Journal of Applied Physics, 1996

System for Time-Resolved Observation of Impulsive Soft X-ray Sources and Its Application to Plasma Focus Experiment(共著)
T YANAGIDAIRA; H KURITA; K HIRANO, Lead, A soft X-ray pinhole camera system for time-resolved, one-dimensional (1D) measurement of an impulsive source whose energy is in the range from 1 keV to 20 keV is developed. The system is based on the filtered pinhole camera. The pinhole image is divided into six channels in the direction of the electrode axis through slits and bundled fiber optics. Each channel is detected with a scintillator-photomultiplier combination. The temporal resolution of this system is 5.2 ns. The absolute sensitivity of the channel is similar to 4.2 x 10(-20) A/[photons/(mrad(2) . s)]. This system was successfully used to observe the time evolution of the soft X-ray source generated with a plasma focus device with a gas-puffed target., JAPAN J APPLIED PHYSICS
Japanese Journal of Applied Physics, 1995

Soft X-Ray Hot Spots Observation in an Argon Admixed Plasma Focus Experiment(共著)
K HIRANO; Y TAKAHAMA; M HAN; T YANAGIDAIRA, Hot spots in a dense plasma focus are investigated with a time-resolved and filtered pinhole camera system through Ar K-lines emission. A Moire Schlieren technique is used to observe the macroscopic plasma behavior conjunctly. The hot spots are generated at the disruption of the plasma column with growth of macroscopic instabilities. At the disrupted regions, the hot spots appear and emit intense K-lines of argon approximately for 15 ns. A spatial distribution of Ar K-line emission is quantitatively obtained using the pinhole camera system. The maximum intensity, approximately 9.8 x 10(11) +170%(-50%) (photons/(s.mm2.(mrad)2.0.01%BW)) is observed when 6% of argon is added to the 4 Torr hydrogen., PHYSICAL SOC JAPAN
Journal of the Physical Society of Japan, 1994

A simple, quantitative method for measuring pulsed soft x rays(共著)
Y TAKAHAMA; J DU; T YANAGIDAIRA; K HIRANO, A simple quantitative image processing system for pulsed soft x rays with time and spatial resolution is described. The system consists of easily obtained commercial components including a microchannel plate-phosphor screen combination, a charge coupled device camera, an image memory board, and a personal computer. To make a quantitative measurement possible, the image processing is used in conjunction with measurement of the ''phosphor screen current.'' Performance of the system is examined using a soft x-ray source generated with a plasma focus device. The order of intensity, similar to 10(12) photons/s mm(2) mrad(2) 0.01% BW of Ar K lines is observed for about 20 ns from the pinched plasma in which 3% of Ar is added to the 6 Torr H-2., AMER INST PHYSICS
Review of Scientific Instruments, 1994

Proposal and investigation of novel portable degradation diagnosis system for PV module in actual operation　　　　　　　　　　　　　　　
T. Tanaka; T. Nagayama; T. Hayashi; T. Yanagidaira; Y. Inui
33rd European photovoltaic solar energy conference and exhibition, 2017, [Reviewed]

パルスパワー排水処理用リアクタの回転軸への非接触給電における磁性体の検討
杉本航太; 石川竜也; Muhammad Nor; Hafizi Bin; Nor Azemi 柳平丈志
第31回電気学会東京支部茨城支所研究発表会, 02 Dec. 2023
20231202, 20231202

パルスパワー排水処理における放電パルス幅とOHラジカル生成量の解析
金子知司; 福田; 拓摩; 窪寺; 倫太郎; 柳平丈志
第31回電気学会東京支部茨城支所研究発表会, 02 Dec. 2023
20231202, 20231202

パルスパワー排水処理用リアクタにおける消費電力の測定と放電現象の解析　　　　　　　　　　　　　　　
金子直樹; 吉岡颯汰; 緑川咲輝; 柳平丈志
第30回 電気学会東京支部茨城支所 研究発表会, 17 Dec. 2022, 電気学会東京支部茨城支所
20221217, 20221217

パルスパワー排水処理用リアクタの水中軸への電磁誘導に基づく昇圧トランスの構成　　　　　　　　　　　　　　　
金子知司; 杉本航太; 緑川咲輝; 柳平丈志
第30回 電気学会東京支部茨城支所 研究発表会, 17 Dec. 2022, 電気学会東京支部茨城支所
20221217, 20221217

パルスパワー排水処理に向けた沿面放電発生用電極の検討　　　　　　　　　　　　　　　
小野 佑太、齊藤 勇燈、藤田 寿哉、榎本 拓未、柳平 丈志
第29回電気学会東京支部茨城支所研究発表会, 11 Dec. 2021
20211211, 20211211

パルスパワー排水処理用リアクタの回転軸への非接触給電方式　　　　　　　　　　　　　　　
緑川 咲輝、嶋貫 岳央、柳平 丈志
第29回電気学会東京支部茨城支所研究発表会, 11 Dec. 2021
20211211, 20211211

パルスパワー排水処理におけるパルス幅の最適化　　　　　　　　　　　　　　　
齊藤 勇燈、横瀬 太陽、柳平 丈志
第29回電気学会東京支部茨城支所研究発表会, 11 Dec. 2021
20211211, 20211211

生物処理と両立したパルスパワー排水処理処理の運転方法の検討　　　　　　　　　　　　　　　
藤田 寿哉、柳平 丈志
第29回電気学会東京支部茨城支所研究発表会, 11 Dec. 2021
20211211, 20211211

MOSトランジスタ並列駆動における百ナノ秒領域のパルス電流分担の改善　　　　　　　　　　　　　　　
岩佐 葵、柳平 丈志
第29回電気学会東京支部茨城支所研究発表会, 11 Dec. 2021
20211211, 20211211

Impact of wastewater treatment with high voltage pulsed discharge on growth rate of freshwater diatoms　　　　　　　　　　　　　　　
Takeshi Yanagidaira
令和２年度電気学会東京支部茨城支所研究発表会予稿集, 06 Feb. 2021

パルス沿面放電による排水処理が淡水の一次生産者 に及ぼす影響　　　　　　　　　　　　　　　
柳平丈志、日吉泰貴
令和元年度 電気学会東京支部茨城支所研究発表会, 07 Dec. 2019, 電気学会

高電圧パルス沿面放電が従属栄養細菌の生菌数に及ぼす影響　　　　　　　　　　　　　　　
柳平丈志; 松林裕士
平成３０年度電気学会東京支部茨城支所研究発表会, 17 Nov. 2018, 電気学会東京支部茨城支所

投げ込み式放電リアクタによる難分解性物質の分解と細菌数の変動　　　　　　　　　　　　　　　
松林 裕士; 柳平 丈志
第17回世界湖沼会議, Oct. 2018

気液境界のパルス沿面放電が微生物の酸素消費に及ぼす影響　　　　　　　　　　　　　　　
柳平 丈志; 松林 裕士
平成 29 年度 電気学会東京支部茨城支所研究発表会, Nov. 2017

回転電極による気液沿面パルス放電の発生　　　　　　　　　　　　　　　
松林 裕士; 柳平 丈志
平成 29 年度 電気学会東京支部茨城支所研究発表会, Nov. 2017

Proposal and investigation of novel portable degradation diagnosis system for PV module in actual operation　　　　　　　　　　　　　　　
T. Tanaka; T. Nagayama; T. Hayashi; T. Yanagidaira; Y. Inui
33rd European Photovoltaic solar energy conference and exhibition (EUPVSEC2017), 2017

回転式リアクターを用いたパルスパワー排水処理　　　　　　　　　　　　　　　
平野貴広; 佐藤秀斗; 松林裕士; 柳平丈志
電気学会東京支部茨城支所 研究発表会, Dec. 2016

A MODULAR PULSE GENERATOR WITH CAPABILITY OF CAPACITIVE ENERGY RECOVERY　　　　　　　　　　　　　　　
Takeshi Yanagidaira; Takehiro Kikuchi and Kei Higashiyama
The 4th Euro-Asian Pulsed Power Conference and the 19th International Conference on High-Power Particle Beams 2012 (EAPPC/BEAMS 2012), 01 Oct. 2012, Karlsruhe Institute of Technology (KIT) and the IEEE Nuclear and Plasma Science Society

AN INSULATED PULSE GENERATOR WITH PULSE CELLS POWERED BY ELECTROMAGNETIC INDUCTION　　　　　　　　　　　　　　　
Takeshi Yanagidaira; Tsutomu Yamada and Masato Orihara
The 4th Euro-Asian Pulsed Power Conference and the 19th International Conference on High-Power Particle Beams 2012 (EAPPC/BEAMS 2012), 01 Oct. 2012, Karlsruhe Institute of Technology (KIT) and the IEEE Nuclear and Plasma Science Society

ＭＯＳトランジスタのパルス駆動における電流分担の改善に関する研究　　　　　　　　　　　　　　　
高木 元; 柳平丈志
平成23年 電気学会 基礎・材料・共通部門大会, 21 Sep. 2011

MOSトランジスタの直列運転のための磁気的な連鎖結合によるゲート駆動回路　　　　　　　　　　　　　　　
海野 聡平; 金高 崇; 岩瀬 千克; 柳平 丈志; 鶴田 浩一
平成20年 電気学会 基礎・材料・共通部門大会, 22 Aug. 2008

小型伝送線路トランスの使用による高繰り返しパルス発生回路　　　　　　　　　　　　　　　
中野 恵介; 矢吹 隆雄; 高木 元; 王 爽; 柳平 丈志; 鶴田 浩一
平成20年 電気学会 基礎・材料・共通部門大会, 22 Aug. 2008

Control of Plasma Motion by the Effect of Magnetic Field in Low Current DC Vacuum Arcs　　　　　　　　　　　　　　　
W.M.R.R. Wanninayake; K. Kobayashi; T. Yanagidaira and K. Tsuruta
平成20年 電気学会 基礎・材料・共通部門大会, 21 Aug. 2008

Development of a Plasma Source for a Vacuum Arc Thruster Controlled by a Microcontroller　　　　　　　　　　　　　　　
S. Shibata; T. Yanagidaira and K. Tsuruta
Proc. XXIInd Int. Symp. on Discharges and Electrical Insulation in Vacuum, 25 Sep. 2006

Effect of Magnetic Field for Sustaining Low Current DC Vacuum Arcs　　　　　　　　　　　　　　　
Koichi Tsuruta; K. Yanagi; Satoru Shibata; Takeshi Yanagidaira and Takashi Ikehata
Proc. XXIInd Int. Symp. on Discharges and Electrical Insulation in Vacuum, 25 Sep. 2006

Expanding Characteristics of Vacuum Arc Plasma in Radial and Axial Direction　　　　　　　　　　　　　　　
M. Ouchi; T. Yanagidaira and K. Tsuruta
Proc. XXIInd Int. Symp. on Discharges and Electrical Insulation in Vacuum, 25 Sep. 2006

Ion Electrostatic Acceleration in a Pulsed Micro Plasma　　　　　　　　　　　　　　　
Takeshi Yanagidaira; Satoshi Kawahara and Koichi Tsuruta
Proc. XXIInd Int. Symp. on Discharges and Electrical Insulation in Vacuum, 25 Sep. 2006

大気圧高周波パルス放電特性の駆動電圧スルーレート依存性
佐藤 直幸; 藤田 佳正; 柳平 丈志; 池畑 隆
電気学会研究会資料. PPT, パルスパワー研究会, 29 Jun. 2006

マイコンにより制御された真空アークスラスター用プラズマ源の開発
柴田 智; 本柳 立太; 柳平 丈志; 鶴田 浩一
電気学会研究会資料. PST, プラズマ研究会, 12 Jan. 2006

Temporal evolution of micro-plasma in a repetitive vacuum arc soft x-ray source　　　　　　　　　　　　　　　
Takeshi Yanagidaira; W. Kotake; H. Miura and K. Tsuruta
Proceedings of XXIth International Symposium on Discharges and Electrical Insulation in Vacuum, 27 Sep. 2004

Effect of Magnetic Field on Sustainment of Low-Current DC Vacuum Arcs　　　　　　　　　　　　　　　
Koichi Tsuruta; M. Nakajima; M. Kitaura and Takeshi Yanagidaira
Proceedings of XXIth International Symposium on Discharges and Electrical Insulation in Vacuum, 27 Sep. 2004

25pA44P スナバを使用しないMOSFET式誘導性パルスパワー電源の検討(プラズマ基礎, (社) プラズマ・核融合学会第21回年会)
元木 聡; 川原 悟史; 木下 正通; 柳平 丈志; 鶴田 浩一
プラズマ・核融合学会年会予稿集, 2004, プラズマ・核融合学会

Soft X-ray Generation after Arc Extinction of a Low-Current, Repetitive Discharge　　　　　　　　　　　　　　　
T. Yanagidaira; H. Abiko; H. Miura and K. Tsuruta
2003 IEEE Int. Conf. Plasma Sci., IEEE Conference Record - Abstracts, Jun. 2003

Improvement of the TOF Measurement for Impulse Vacuum Arc Metal Ions　　　　　　　　　　　　　　　
K. Tsuruta; Y. Manabe and T. Yanagidaira
2003 IEEE Int. Conf. Plasma Sci., IEEE Conference Record - Abstracts, Jun. 2003

26aB27P 高繰り返し真空アーク軟X線源の陰極点プラズマの時間進展(プラズマ基礎・応用)
三浦 弘道; 小竹 航; 柳平 丈志; 鶴田 浩一
プラズマ・核融合学会年会予稿集, 2003, プラズマ・核融合学会

Experimental Characterization of Vacuum Arc Instabilities for Different Electrode Material　　　　　　　　　　　　　　　
K. Tsuruta; N. Tanaka; K. Takano; M. Nakajima and T. Yanagidaira
Proc. 20th Inter. Symp. on Discharges and Electrical Insulation in Vacuum, Jul. 2002

Soft X-ray Emission in a Low-Current, Repetitive Vacuum Arc　　　　　　　　　　　　　　　
T. Yanagidaira; D. Nose; H. Abiko; H. Miura and K. Tsuruta
Proc. 20th Inter. Symp. on Discharges and Electrical Insulation in Vacuum, Jul. 2002

Soft X-Ray Emission from a Low-Current, Pulsed Vacuum Arc　　　　　　　　　　　　　　　
T. Yanagidaira; D. Nose and K. Tsuruta
Proc. of Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering, Nov. 2001

Influence of Electrode Material on Instability of DC Vacuum Arc　　　　　　　　　　　　　　　
K. Tsuruta; M. Nakajima; N. Tanaka and T. Yanagidaira
Proc. of Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering, Nov. 2001

真空小電流間欠アーク放電における軟X線の観測
野瀬 大樹; 柳平 丈志; 鶴田 浩一
電気学会研究会資料. ED, 放電研究会, 25 Oct. 2001

電気学会

プラズマ核融合学会

浄化槽に適用可能な水中放電型促進酸化リアクタの開発
Grant-in-Aid for Scientific Research (C)
Ibaraki University
Apr. 2023 - Mar. 2026

Investigation on recycle of positive electrode of Li-ion battery using pulse discharge with high voltage at atmospheric pressure
Grant-in-Aid for Scientific Research (C)
Ibaraki University
Apr. 2020 - Mar. 2023

特許第5737750号, 特願2011-039632, 交流電力測定装置

4448965, 2005329777, 2004-148586, 電気鉄道におけるアーク放電抑制装置
鶴田浩一, 柳平丈志, 大沢猛, 天津牧人

平成２７年度 ものづくり中核人材育成講座 「電気回路設計基礎」講師（社会人向け講座）　　　　　　　　　　　　　　
lecturer
Sep. 2015

平成２６年度 ものづくり中核人材育成講座 「電気回路設計基礎」講師（社会人向け講座）　　　　　　　　　　　　　　
lecturer
Sep. 2014

平成２５年度 ものづくり中核人材育成講座 「電気回路設計基礎」講師（社会人向け講座）　　　　　　　　　　　　　　
lecturer
Sep. 2013