Researcher Profile and Settings

Affiliation

• ＜Faculty / Graduate School / Others＞

  Graduate School of Engineering / Department of Electrical and Electronic Engineering

• ＜Related Faculty / Graduate School / Others＞

  Faculty of Engineering / Department of Electrical and Electronic Engineering

Teaching

• Office for the Promotion of International Exchange, 2022, Introduction to Computer Literacy

  Link to Kobe Univ. syllabus

Research Activities

Research Interests

• nuclear fusion science
• electric propulsion
• plasma science and technology

Research Areas

• Aerospace, marine, and maritime Engineering / Aerospace engineering
• Energy / Basic plasma science / plasma propulsion

Awards

• Nov. 2018 Association of Asia Pacific Physical Societies (AAPPS), 2018 AAPPS-DPP Poster Prize

  Furukawa Takeru, Kaichi Shimura, Daisuke Kuwahara, Shunjiro Shinohara

Published Papers

• Convergent neutral gas injection using supersonic gas puffing (SSGP) method for propellant feeding system in RF electric propulsion

  Takeru Furukawa, Yuichi Ishigami, Daisuke Kuwahara, Jyunichi Miyazawa, Shunjiro Shinohara

  A convergent gas feeding method is proposed to alleviate neutral gas depletion near the central plasma region in typical electrodeless radio-frequency (RF)/helicon plasma thrusters. To achieve further performance improvement, the SuperSonic Gas Puffing (SSGP) system is one of the methods that is expected to overcome the above-mentioned depletion and the density limit. This study discovered that the spatiotemporal profiles of the neutral pressure and the estimated gas diffusion angle vary depending on the SSGP gas feeding condition, i.e., the nozzle size, filling pressure, and the valve opening time. Convergent gas feeding is successfully conducted using the SSGP method in a vacuum. As a preliminary study, high-density plasma is also obtained in the vicinity of the gas injection region using the developed SSGP system. The effects of the gas feeding position and an external divergent magnetic field on the plasma density are investigated. A suitable gas feeding position/region exists for plasma generation using the RF/helicon plasma thruster.

  AIP Publishing, 01 Aug. 2022, Review of Scientific Instruments, 93 (8), 083501 - 083501, English

  [Refereed]

  Scientific journal

• Measurement of plasma flow and electron energy probability function in radio frequency plasma thruster with a magnetic cusp

  T. Furukawa, Y. Yarita, H. Aoyagi, H. Nishida

  The use of a cusp magnetic field is studied to improve the thrust performance of small electrodeless radio frequency (RF) plasma thrusters based on a theoretical analysis of a magnetized inductively coupled plasma. In this type of thruster, electrons play a critical role in determining the thrust performance. The electron energy probability function (EEPF) and two-dimensional profiles of the plasma parameters in the cusp-type magnetic field RF thruster are investigated to characterize the plasma flow. Non-Maxwellian EEPFs were obtained, which correspond to the pressure and plasma potential profiles in the plasma plume. In addition, the axial ion velocity was measured, and the presence of ion flux in the downstream direction is revealed, indicating ideal ion acceleration.

  AIP Publishing, 07 May 2022, Journal of Applied Physics, 131 (17), 173302 - 173302, English

  [Refereed]

  Scientific journal

• Numerical analysis of RF discharge in a nonuniform magnetic field

  Xiang Ma, Hiroyuki Nishida, Yuya Oshio, Takeru Furukawa

  The radio-frequency (RF) plasma thruster has been studied to overcome the issue of a reduced lifetime of plasma thrusters due to electrode erosion, and it has been reported that a nonuniform magnetic field near the RF antenna improves the thrust performance. In this study, to obtain knowledge for optimizing the configuration of the thruster and the magnetic field, the RF discharge in a nonuniform magnetic field is numerically investigated focusing on RF power absorption and plasma generation, and the effect of the positional relation between the magnetic cusp and the RF antenna on the RF discharge is discussed. We adopt the two-fluid plasma model considering ions and electrons and confirm the qualitative validity of the simulation by comparing the simulation results with the results of a laboratory experiment. The simulation reveals that the energy transport due to the [Formula: see text] drift from the region of RF power absorption near the RF antenna determines the distributions of the plasma generation and temperature. Therefore, the plasma distribution changes depending on the RF antenna position and the phase of the RF period because the [Formula: see text] drift direction changes depending on the directions of the electric and magnetic fields. In addition, we find that it is important to place the antenna in a strong magnetic field for effective power absorption because this increases the azimuthal diamagnetic current.

  AIP Publishing, 28 Feb. 2022, Journal of Applied Physics, 131 (8), 083302 - 083302, English

  [Refereed]

  Scientific journal

• Spatial characteristics of rotating magnetic field (RMF) plasma acceleration method in open magnetic field configuration under partial RMF penetration

  T. Furukawa, D. Kuwahara, S. Shinohara

  AIP Publishing, Jul. 2021, Physics of Plasmas, 28 (7), 073507 - 073507, English

  [Refereed]

  Scientific journal

• Verification of azimuthal current generation employing a rotating magnetic field plasma acceleration method in an open magnetic field configuration

  T. Furukawa, K. Shimura, D. Kuwahara, S. Shinohara

  AIP Publishing, Mar. 2019, Physics of Plasmas, 26 (3), 033505 - 033505, English

  [Refereed]

  Scientific journal

• Development of featured high-density helicon sources and their application to electrodeless plasma thruster

  Shunjiro Shinohara, Daisuke Kuwahara, Takeru Furukawa, Shuichi Nishimura, Tomoya Yamase, Yuichi Ishigami, Hirotaka Horita, Akihiko Igarashi, Shinichi Nishimoto

  IOP Publishing, 01 Jan. 2019, Plasma Physics and Controlled Fusion, 61 (1), 014017 - 014017, English

  [Refereed]

  Scientific journal

• Spatial measurement in rotating magnetic field plasma acceleration method by using two-dimensional scanning instrument and thrust stand

  T. Furukawa, K. Takizawa, K. Yano, D. Kuwahara, S. Shinohara

  AIP Publishing, Apr. 2018, Review of Scientific Instruments, 89 (4), 043505 - 043505, English

  [Refereed]

  Scientific journal

• Electrodeless plasma acceleration system using rotating magnetic field method

  T. Furukawa, K. Takizawa, D. Kuwahara, S. Shinohara

  We have proposed Rotating Magnetic Field (RMF) acceleration method as one of electrodeless plasma accelerations. In our experimental scheme, plasma generated by an rf (radio frequency) antenna, is accelerated by RMF antennas, which consist of two-pair, opposed, facing coils, and these antennas are outside of a discharge tube. Therefore, there is no wear of electrodes, degrading the propulsion performance. Here, we will introduce our RMF acceleration system developed, including the experimental device, e.g., external antennas, a tapered quartz tube, a vacuum chamber, external magnets, and a pumping system. In addition, we can change RMF operation parameters (RMF applied current I-RMF and RMF current phase difference phi, focusing on RMF current frequency f(RMF)) by adjusting matching conditions of RMF, and investigate the dependencies on plasma parameters (electron density n(e) and ion velocity v(i)); e.g., higher increases of n(e) and v(i) (similar to 360 % and 55 %, respectively) than previous experimental results were obtained by decreasing fRMF from 5 MHz to 0.7 MHz, whose RMF penetration condition was better according to Milroy's expression. Moreover, time-varying component of RMF has been measured directly to survey the penetration condition experimentally. (C) 2017 Author(s).

  AMER INST PHYSICS, Nov. 2017, AIP ADVANCES, 7 (11), English

  [Refereed]

  Scientific journal

• Study on electromagnetic plasma propulsion using rotating magnetic field acceleration scheme

  T. Furukawa, K. Takizawa, D. Kuwahara, S. Shinohara

  As one of the electromagnetic plasma acceleration systems, we have proposed a rotating magnetic field (RMF) acceleration scheme to overcome the present problem of direct plasma-electrode interactions, leading to a short lifetime with a poor plasma performance due to contamination. In this scheme, we generate a plasma by a helicon wave excited by a radio frequency (rf) antenna which has no direct-contact with a plasma. Then, the produced plasma is accelerated by the axial Lorentz force f(z) = j(theta) x B-r (j(theta) is an azimuthal current induced by RMF, and Br is an external radial magnetic field). Erosion of electrodes and contamination are not expected in this total system since RMF coils and an rf antenna do not have contact with the plasma directly. Here, we have measured the plasma parameters (electron density ne and axial ion velocity vi) to demonstrate this RMF acceleration scheme by the use of AC currents in two sets of opposing coils to generate a RMF. The maximum increasing rate Delta(vi) /v(i) was similar to 28% (maximum v(i) of similar to 3 km/s), while the density increasing rate of Delta n(e)/n(e) is similar to 70% in the case of a RMF current frequency f(RMF) of 3 MHz, which showed a better plasma performance than that with f(RMF) = 5MHz. Moreover, thrust characteristics such as a specific impulse and a thrust efficiency were discussed, although a target plasma was not optimized. Published by AIP Publishing.

  AMER INST PHYSICS, Apr. 2017, PHYSICS OF PLASMAS, 24 (4), English

  [Refereed]

  Scientific journal

MISC

• Validation of Electromagnetic Force Enhancement in Electrodeless Electromagnetic Acceleration Thruster

  Takeru Furukawa, Taisuke Torin, Daisuke Kuwahara, Hiroyuki Nishida, Shunjiro Shinohara

  Lead, Nov. 2021, 第65回宇宙科学技術連合講演会, Japanese, Paper_Sample65-1_農工大古川_ver.3.2.pdf, Preprint, Password protected

  Summary national conference

  添付ファイルのURL
• Verification of Dependence on RMF Rotational Frequency in Electrodeless RF Electric Propulsion Using RMF Acceleration Method

  Takeru Furukawa, Daisuke Kuwahara, Shunjiro Shinohara

  Lead, Oct. 2020, 第64回宇宙科学技術連合講演会電気推進・先端推進部門企画OS18「波動推進および将来型宇宙推進（4）」, Japanese, 4_Paper_Sample63m_TFurukawa2020_ver.2.pdf, Preprint, Password protected

  Summary national conference

  添付ファイルのURL
• Electrodeless Plasma Propulsion with Electromagnetic Acceleration Effect by Using Rotating Magnetic Field Current Drive Method

  Takeru Furukawa, Daisuke Kuwahara, Shunjiro Shinohara

  Lead, American Institute of Aeronautics and Astronautics, 24 Aug. 2020, AIAA Propulsion and Energy 2020 Forum, English

  Summary international conference

• Plasma Fluid Simulation of RF Discharge in Non-Uniform Magnetic Field for RF Plasma Thruster

  Xiang Ma, Takeru Furukawa, Yuya Oshio, Hiroyuki Nishida

  American Institute of Aeronautics and Astronautics, 24 Aug. 2020, AIAA Propulsion and Energy 2020 Forum, English

  Summary international conference

• Characteristics of Traveling Magnetic Field Acceleration for Electrodeless RF Plasma Thruster

  Yuya Oshio, Seia Ogasawara, Takeru Furukawa, Hiroyuki Nishida

  American Institute of Aeronautics and Astronautics, 24 Aug. 2020, AIAA Propulsion and Energy 2020 Forum, English

  Summary international conference

• RF Electrodeless Plasma Propulsion Using RMF Additional Acceleration Method

  Takeru Furukawa, Kaichi Shimura, Daisuke Kuwahara, Shunjiro Shinohara

  Lead, Nov. 2019, 第63回宇宙科学技術連合講演会 電気推進・先端推進部門企画OS-07-2「高エネルギー電磁波の宇宙推進への応用」, Japanese, 2_Paper_Sample63m_TFurukawa.pdf, Preprint, Password protected

  Summary national conference

  添付ファイルのURL
• Electrodeless Helicon Plasma Thruster Employing Additional Electromagnetic Acceleration Methods

  Takeru Furukawa, Kaichi Shimura, Syuhei Yamamura, Koji Hachisu, Daisuke Kuwahara, S. Shinohara

  Lead, Sep. 2019, The 36th International Electric Propulsion Conference (IEPC), English, 3_IEPC2019_Furukawa198.pdf, Preprint, No password

  Summary international conference

  添付ファイルのURL
• Two Dimensional Characteristics of Electromagnetic Plasma Acceleration by Using Rotating Magnetic Field

  T. Furukawa, K. Takizawa, D. Kuwahara, S. Shinohara

  Lead, Oct. 2017, The 35th International Electric Propulsion Conference (IEPC), English, 2_20170921_iepc_paper_furukawa1.3 (1).pdf, Preprint, No password

  Summary international conference

  添付ファイルのURL
• Parameter Survey on Rotating Magnetic Field Acceleration Method

  Takeru Furukawa

  Lead, Jun. 2017, 31st International symposium on Space Technology and Science (ISTS), English, 1_20170414_ISTS2017_student session_M1古川final.pdf, Preprint, Password protected

  Summary international conference

  添付ファイルのURL

Presentations

• Evaluation of Electron Energy Probability Function in an RF Plasma Thruster Using a Single Helical Antenna

  Riko YAMAMOTO, Satoshi NAKAMOTO, Takeru FURUKAWA, Hiromasa TAKENO

  The 11th Asian Joint Conference on Propulsion and Power, 17 Mar. 2023, English

  Oral presentation

• 単一ヘリカルアンテナ型電気推進エンジン模擬実験装置におけるプラズマ流内の電子エネルギー評価に関する研究

  山本莉子, 森脇真大, 古川武留, 竹野裕正

  令和4年度電気学会関西連合大会, 26 Nov. 2022, Japanese

  Oral presentation

• Evaluation of ion flow velocity in electrodeless electric propulsion using the rotating magnetic field plasma acceleration

  T. Furukawa, D. Kuwahara, S. Shinohara

  プラズマ・核融合学会第39回年会, 24 Nov. 2022, Japanese

  Poster presentation

• 二次電子放出を利用した高速イオンからのエネルギー回収におけるカスプ磁場による二次電子捕集量向上に関する研究II

  清水龍大, 中本聡, 古川武留, 竹野裕正, 古山雄一, 谷池晃

  プラズマ・核融合学会第39回年会, 24 Nov. 2022, Japanese

  Poster presentation

• ヘリウム3燃料核融合直接発電におけるイオン-イオン分離の模擬実験II

  中西快, 中本聡, 古川武留, 竹野裕正, 宮澤順一, 後藤拓也

  プラズマ・核融合学会第39回年会, 24 Nov. 2022, Japanese

• ダイバータ熱負荷低減模擬実験のためのバイアス型カロリーメータによる熱量測定II

  渋谷正樹, 菅野浩史, 古川武留, 中本聡, 竹野裕正, 松浦寛人, 中嶋洋輔, 平田真史

  プラズマ・核融合学会第39回年会, 24 Nov. 2022, Japanese

  Poster presentation

• Evaluation of Steady-State High-Density Helicon Plasma Source with a Two-Turn Flat Loop Antenna for DEMO Divertor Simulation Plasma Generation

  SETO Takumi, EZUMI Naomichi, MIYAUCHI Reina, SHIGEMATSU Naoki, OKAMOTO Takuma, TAKANASHI Kosuke, TAKAHASHI Satoshi, HIRATA Mafumi, TOGO Satoshi, SAKAMOTO Mizuki, FURUKAWA Takeru, SHINOHARA Shunjiro

  プラズマ・核融合学会第39回年会, 23 Nov. 2022, Japanese

  Poster presentation

• Investigation of ion acceleration in electrodeless plasma thruster using rotating magnetic field acceleration method

  Takeru Furukawa, Daisuke Kuwahara, Shunjiro Shinohara

  The 31st International Toki Conference on Plasma and Fusion Research, 09 Nov. 2022, English

  Poster presentation

• Development of Steady State HighDensity Helicon Plasma Source with 2- turn Flat Loop Antenna for DEMO Divertor Simulation Experiment

  T. Seto, N. Ezumi, R. Miyauchi, N. Shigematsu, T. Okamoto, S. Takahashi, K. Takanashi, M. Hirata, S. Togo, M. Sakamoto, T. Furukawa, S. Shinohara

  The 31st International Toki Conference on Plasma and Fusion Research, 08 Nov. 2022, English

  Poster presentation

• Analysis of deterioration of particle separation performance in a cusp-type direct energy converter simulator

  T. Kunisada, K. Ibata, R. Nakaya, S. Nakamoto, T. Furukawa, H. Takeno

  The 31st International Toki Conference on Plasma and Fusion Research, 08 Nov. 2022, English

  Poster presentation

• Efficiency dependence on deceleration voltage in a simulation experiment of traveling wave direct energy converter

  H. Takeno, K. Shibata, S. Nakamoto, T. Furukawa, Y. Nakashima

  The 31st International Toki Conference on Plasma and Fusion Research, 08 Nov. 2022, English

  Poster presentation

• Heat quantity measurement for a simulation experiment of divertor thermal load reduction by direct energy conversion

  H. Kanno, M. Shibuya, T. Furukawa, S. Nakamoto, H. Takeno, H. Matsuura, Y. Nakashimab, M. Hirata

  The 31st International Toki Conference on Plasma and Fusion Research, 08 Nov. 2022, English

  Poster presentation

• リング型永久磁石のカスプ磁場によるダイバータ熱負荷低減模擬実験II

  菅野浩史, 岸本大輝, 渋谷正樹, 古川武留, 中本聡, 竹野裕正, 松浦寛人, 中嶋洋輔, 平田真史

  第14回核融合エネルギー連合講演会, 07 Jul. 2022, Japanese

  Poster presentation

• Ion Flow Velocimetry in Radio Frequency Plasma Thruster Using Additional Rotating Magnetic Field Acceleration Method

  Takeru Furukawa, Daisuke Kuwahara, Shunjiro Shinohara

  International Electric Propulsion Conference 2022, 23 Jun. 2022, English

  Oral presentation

• Low RF Power Test for Steady State High Density Helicon Plasma Source with Flat Loop Antennas

  T. Seto, A. Kondo, N. Ezumi, M. Hirata, S. Togo, M. Sakamoto, T. Furukawa, S. Shinohara

  The 69th JSAP Spring Meeting 2022, 22 Mar. 2022, Japanese

  Oral presentation

• Dependence of Electromagnetic Force on Applied Current in Electrodeless Plasma Thruster Using m = 0 Half-cycle Acceleration Method

  T. Furukawa, T. Torin, D. Kuwahara, H. Nishida, S. Shinohara

  33rd ISTS, 10th NSAT & 14th IAA LCPM, 03 Mar. 2022, English

  Oral presentation

• Numerical analysis on effect of magnetic cusp on discharge characteristic in RF plasma thruster

  X. Ma, T. Furukawa, H. Nishida

  33rd ISTS, 10th NSAT & 14th IAA LCPM, 03 Mar. 2022, English

  Oral presentation

• Effect of Discahrge Tube Diameter on Thrust Performance in Electrodeless RF Plasma Thruster with Magnetic Cusp

  Hiroto Aoyagi, Akari Itagaki, Takeru Furukawa, Hiroyuki Nishida

  令和3年度宇宙輸送シンポジウム, 14 Jan. 2022, Japanese

  Oral presentation

• Feedback Control of Flow Separation over Airfoil with Deep Reinforcement Learning in Numerical Simulation

  Naoki Takada, Tatsumasa Ishikawa, Takeru Furukawa, Hiroyuki Nishida

  AIAA SCITECH 2022 Forum, 06 Jan. 2022, English

  Oral presentation

• Investigation of electromagnetic acceleration effect in electrodeless electric thruster using m = 0 half-cycle acceleration method

  T. Furukawa, T. Torin, D. Kuwahara, H. Nishida, S. Shinohara

  第38回プラズマ・核融合学会年会, 24 Nov. 2021, Japanese

  Poster presentation

• Deelopment of High Frequency Plasma Source with Flat Loop Antenna for Steady State High Density Divertor Simulation Plasma Generation

  T. Seto, N. Ezumi, A. Kondo, T. Sugiyama, H. Gamo, N. Shigematsu, M. Sakamoto, M. Hirata, S. Togo, S. Shinohara, T. Furukawa

  第38回プラズマ・核融合学会年会, 23 Nov. 2021, Japanese

  Poster presentation

• Dvelopment of geenration and measurement methods for neutral gas beam using supersonic gas puffing

  D. Kuwahara, T. Furukawa, J. Miyazawa, K. Hattori, Y. Nakajima, S. Shinohara

  第38回プラズマ・核融合学会年会, 23 Nov. 2021, Japanese

  Oral presentation

• Spatial Profiles of Ion Flow Accelerated by Using Electromagnetic Plasma Acceleration Method in Electrodeless RF Plasma Thruster

  T. Furukawa, D. Kuwahara, S. Shinohara

  63rd Annual Meeting of the APS Division of Plasma Physics, 09 Nov. 2021, English

  Poster presentation

• Investigation of Electromagnteic Force Enhancement in Electrodeless Acceleration Thruster

  T. Furukawa, T. Torin, D. Kuwahara, H. Nishida, S. Shinohara

  第65回宇宙科学連合講演会, 11 Nov. 2021, Japanese

  Oral presentation

• Generation and measurement methods for neutral gas beam using supersonic gas puffing

  D. Kuwahara, T. Furukawa, J. Miyazawa, K. Hattori, Y. Nakashima, S. Shinohara

  5th Asia-Pacific Conference on Plasma Physics, 01 Oct. 2021, English

  [Invited]

  Invited oral presentation

• The Effect of Wall Surface and Dot Deformation on Density Field Measurement of the Flow Induced by Dielectric Barrier-discharge-plasma Actuator Using the Background-oriented-schlieren Method

  Y. Kaneko, H. Nishida, T. Furukawa, Y. Tagawa

  第53回流力講演会, 02 Jul. 2021, Japanese

  Oral presentation

• RF Plasma generation using Supersonic Gas Puffing (SSGP)

  D. Kuwahara, T. Furukawa, Y. Ishigami, J. Miyazawa, S. Shunjiro

  令和２年度 宇宙輸送シンポジウム, 14 Jan. 2021, Japanese

  Oral presentation

• Investigation of Effect of Rotational Frequency on Plasma Acceleration in Electrodeless Rotating Magnetic Field Method

  T. Furukawa, D. Kuwahara, S. Shinohara

  令和２年度 宇宙輸送シンポジウム, 14 Jan. 2021, Japanese

  Oral presentation

• プラズマアクチュエータを用いた角柱の交流制御において前縁および後縁形状が及ぼす影響

  関根立弓, 西田浩之, 古川武留, 関希美

  第34回数値流体力学シンポジウム, 23 Dec. 2020, Japanese

  Oral presentation

• Investigation of Dependence of Electromagnetic Acceleration Effect on Rotational Frequency by Electrodeless Rotating Magnetic Field Acceleration Method

  T. Furukawa, D. Kuwahra, S. Shinohara

  第37回プラズマ・核融合学会 年会, 01 Dec. 2020, English

  Poster presentation

• 2D Spatial Profiles of Ion Velocity Distribution Functions in Rotating Magnetic Field Plasma Acceleration Method

  T. Furukawa, D. Kuwahara, S. Shinohara

  62nd Annual Meeting of the APS Division of Plasma Physics, Virtual DPP meeting, 11 Nov. 2020, English

  Poster presentation

• Study of advanced gas feeding methods for radio-frequency plasma thruster

  D. Kuwahara, Y. Ishigami, T. Furukawa, J. Miyazawa, T. Mutoh, S. Shinohara

  4th Asia-Pacific Conference on Plasma Physics, 30 Oct. 2020, English

  [Invited]

  Invited oral presentation

• Experimental Study of Additional Plasma Acceleration Method Using Rotating Magnetic Field in Electrodeless Plasma Propulsion

  T. Furukawa, D. Kuwahara, S. Shinohara

  4th Asia-Pacific Conference on Plasma Physics, 27 Oct. 2020, English

  [Invited]

  Invited oral presentation

• Measurement of Ion Energy Distribution of Exhaust Plasma Flow for Cusp Magnetic Field Type RF Plasma Thruster

  H. Aoyagi, K. Shimura, T. Furukawa, Y. Oshio, H. Nishida

  第64回宇宙科学技術連合講演会, 27 Oct. 2020, Japanese

  Oral presentation

• Survey of Dependence on RMF Rotational Frequency in Electrodeless RF Electric Propulsion Using RMF Acceleration Method

  T. Furukawa, D. Kuwahara, S. Shunjiro

  第64回宇宙科学技術連合講演会, 27 Oct. 2020, Japanese

  Oral presentation

• Characteristics of Traveling Magnetic Field Acceleration for Electrodeless RF Plasma Thruster

  Y. Oshio, S. Ogasawara, T. Furukawa, H. Nishida

  AIAA Propulsion and Energy 2020 Forum, 26 Aug. 2020, English

  Oral presentation

• Electrodeless Plasma Propulsion with Electromagnetic Acceleration Effect by Using Rotating Magnetic Field Current Drive Method

  T. Furukawa, D. Kuwahara, S. Shinohara

  AIAA Propulsion and Energy 2020 Forum, 26 Aug. 2020, English

  Oral presentation

• Plasma Fluid Simulation of RF Discharge in Non-Uniform Magnetic Field for RF Plasma Thruster

  X. Ma, T. Furukawa, Y. Oshio, H. Nishida

  AIAA Propulsion and Energy 2020 Forum, 26 Aug. 2020, English

  Oral presentation

• 無電極rfプラズマスラスタにおける回転磁場加速への印加周波数の影響

  古川 武留, 桑原 大介, 篠原 俊二郎

  令和元年度 宇宙輸送シンポジウム, 16 Jan. 2020, Japanese

  Oral presentation

• 無電極RFプラズマスラスタのアンテナとカスプ磁場配位がプラズマ特性に与える影響

  志村開智, 古川 武留, 大塩裕哉, 西田浩之

  令和元年度 宇宙輸送シンポジウム, 16 Jan. 2020, Japanese

  Oral presentation

• 非一様磁場型RFプラズマスラスタの磁場強度がプラズマ流に与える影響

  松島和孝, 大塩裕哉, 古川武留, 西田浩之

  令和元年度 宇宙輸送シンポジウム, 16 Jan. 2020, Japanese

  Oral presentation

• Study of neutral gas feeding position on radio-frequency plasma thruster

  D. Kuwahara, T. Furukawa, Y. Ishigami, S. Shinohara

  36th Annual Meeting of The Japan Society of Plasma Science and Nuclear Fusion Research, 02 Dec. 2019, Japanese, Domestic conference

  Poster presentation

• Investigation of dependence on time-varying magnetic field strength in RMF acceleration method

  T. Furukawa, D. Kuwahara, S. Shinohara

  36th Annual Meeting of The Japan Society of Plasma Science and Nuclear Fusion Research, 30 Nov. 2019, Japanese, Domestic conference

  Oral presentation

• Plasma Characteristics of Electrodeless RF Plasma Thruster Utilizing Non-Uniform Magnetic Field Configuration

  S. Shimura, T. Furukawa, Y. Oshio, H. Nishida

  36th Annual Meeting of The Japan Society of Plasma Science and Nuclear Fusion Research, 29 Nov. 2019, Japanese, Domestic conference

  Poster presentation

• カスプ磁場型RFプラズマスラスタにおけるアンテナ位置がRF放電特性に与える影響

  馬祥, 古川武留, 大塩裕哉, 西田浩之

  第33回数値流体力学シンポジウム, 27 Nov. 2019, Japanese, Domestic conference

  Oral presentation

• 電気推進機の長寿命化を目指した無電極RFプラズマスラスタの研究開発

  古川武留, 小笠原世亜, 志村開智, 松島和孝, 大塩祐哉, 桑原大介, 西田浩之, 篠原俊二郎

  第5回宇宙太陽発電シンポジウム, 22 Nov. 2019, Japanese, Domestic conference

  Oral presentation

• Measurement of Exhaust Plasma and Performance Evaluation in Non-uniform Magnetic Field Type Electrodeless RF Plasma Thruster

  志村開智, 松島和孝, 古川武留, 大塩裕哉, 西田浩之

  第63回宇宙科学技術連合講演会, 08 Nov. 2019, Japanese, Domestic conference

  Invited oral presentation

• RF Electrodeless Plasma Propulsion Using RMF Additional Acceleration Method

  古川武留, 志村開智, 桑原大介, 篠原俊二郎

  第63回宇宙科学技術連合講演会, 08 Nov. 2019, Japanese, Domestic conference

  Invited oral presentation

• Helicon Plasma Thruster Employing Rotating Magnetic Field Plasma Acceleration Method

  T. Furukawa, D. Kuwahara, S. Shinohara

  61st Annual Meeting of the APS (American Physical Society) Division of Plasma Physics 2019,, 23 Oct. 2019, English, International conference

  Poster presentation

• Electrodeless Helicon Plasma Thruster Employing Additional Electromagnetic Acceleration Methods

  T. Furukawa, K. Shimura, S. Yamamura, K. Hachisu, D. Kuwahara, S. Shunjiro

  The 36th International Electric Propulsion Conference (IEPC), 18 Sep. 2019, English, International conference

  Oral presentation

• Studies on Helicon Plasma Thruster and Measurement Methods

  D. Kuwahara, T. Furukawa, K. Amma, Y. Ishigami, H. Horita, S. Shinohara

  The 36th International Electric Propulsion Conference (IEPC), 16 Sep. 2019, English, International conference

  Poster presentation

• Estimation of electromagnetic force in electrodeelss plasma acceleration employing RMF method

  古川武留, 志村開智, 桑原大介, 篠原俊二郎

  平成 30 年度宇宙輸送シンポジウム 非化学推進部門, 17 Jan. 2019, Japanese, Domestic conference

  Oral presentation

• Estimation of Plasma Acceleration in Rotating Magnetic Field Method

  古川武留, 志村開智, 桑原大介, 篠原俊二郎

  35th the Japan Society of Plasma Science and Nuclear Fusion Research Annual Meeting, 05 Dec. 2018, Japanese, Domestic conference

  Poster presentation

• Measurement of Azimuthal Current in Rotating Magnetic Field Plasma Acceleration Method

  T. Furukawa, K. Shimura, D. Kuwahara, S. Shinohara

  The 27th Toki Conference on Plasma and Fusion Research & The 13th Asia Pacific Plasma Theory Conference, 19 Nov. 2018, English, International conference

  Poster presentation

• Study on Helicon Plasma Thruster using Internal Gas Feeding Method

  D. Kuwahara, T. Furukawa, Y. Ishigami, J. Miyazawa, T. Mutoh, S. Shinohara

  2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP 2018), 16 Nov. 2018, English, International conference

  Oral presentation

• High-Dense, Helicon Plasma Acceleration Using Rotating Magnetic Field Method

  T. Furukawa, K. Shimura, D. Kuwahara, S. Shinohara

  2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP 2018), 15 Nov. 2018, English, International conference

  Poster presentation

• Spatially Excited Magnetic Field Profiles in Rotating Magnetic Field Plasma Acceleration Scheme

  T. Furukawa, K. Shimura, D. Kuwahara, S. Shinohara

  60th Annual Meeting of the APS (American Physical Society) Division of Plasma Physics 2018, 06 Nov. 2018, English, International conference

  Poster presentation

• Spatial Magnetic Field Measurement in Electrodeless Plasma Propulsion Scheme Using Rotating Magnetic Field

  T. Furukawa, K. Shimura, D. Kuwahara, S. Shinohara

  19th International Congress on Plasma Physics (ICPP), 05 Jun. 2018, English, International conference

  Poster presentation

• Overview of Helicon Electrodeless Advanced Thruster (HEAT) Project

  S. Shinohara, D. Kuwahara, T. Furukawa, S. Nishimura, T. Yamase

  19th International Congress on Plasma Physics (ICPP), 05 Jun. 2018, English, International conference

  Poster presentation

• Experiment on Electrodeless Plasma Acceleration by RMF Antenna

  古川武留, 志村開智, 桑原大介, 篠原俊二郎

  平成 29 年度宇宙輸送シンポジウム 非化学推進部門, 19 Jan. 2018, Japanese, Domestic conference

  Oral presentation

• Study on Plasma Characteristics Using RMF Plasma Acceleration Method

  T. Furukawa, K. Shimura, D. Kuwahara, S. Shinohara

  26th International Toki Conference and 11th Asia Plasma & Fusion Association Conference, 05 Dec. 2017, English, International conference

  Poster presentation

• Characteristics of Plasma Performance by RMF Acceleration Method

  K. Shimura, T. Furukawa, D. Kuwahara, S. Shinohara

  Plasma Conference 2017, 21 Nov. 2017, English, International conference

  Poster presentation

• ExperimentalPlasma Acceleration by Rotating Magnetic Field Method Using Helicon Source study of Helicon Plasma Thruster using Advanced Acceleration Method

  T. Furukawa, K. Shimura, D. Kuwahara, S. Shinohara

  59th Annual Meeting of the APS (American Physical Society) Division of Plasma Physics 2017, 25 Oct. 2017, English, International conference

  Poster presentation

• Experimental study of Helicon Plasma Thruster using Advanced Acceleration Method

  D. Kuwahara, S. Nishimura, T. Furukawa, T. Yamase, D. Arai, K. Amma, Y. Ishigami, H. Horita, S. Shinohara

  The 35th International Electric Propulsion Conference (IEPC), 09 Oct. 2017, English, International conference

  Poster presentation

• Two Dimensional Characteristics of Electromagnetic Plasma Acceleration by Using Rotating Magnetic Field

  T. Furukawa, K. Takizawa, D. Kuwahara, S. Shinohara

  The 35th International Electric Propulsion Conference (IEPC), 09 Oct. 2017, English, International conference

  Oral presentation

• Parameter survey on Rotating Magnetic Field Acceleration

  T. Furukawa

  31st International symposium on Space Technology and Science (ISTS) 2017, 08 Jun. 2017, English, International conference

  Invited oral presentation

• Characteristics of Helicon Plasma Thruster using Advanced Acceleration Methods

  D. Kuwahara, S. Nishimura, T. Furukawa, T. Yamase, D. Arai, K. Amma, Y. Ishigami, H. Horita, S. Shinohara

  31st International symposium on Space Technology and Science (ISTS) 2017, 07 Jun. 2017, English, International conference

  Poster presentation

• Characteristics of Electrodeless Plasma Acceleration by Rotating Magnetic Field Method (II)

  古川武留, 瀧澤耕平, 桑原大介, 篠原俊二郎

  平成 28 年度宇宙輸送シンポジウム 非化学推進部門, 20 Jan. 2017, Japanese, Domestic conference

  Oral presentation

• Characteristics of Electrodeless Plasma Acceleration by Rotating Magnetic Field Method (I)

  瀧澤耕平, 古川武留, 桑原大介, 篠原俊二郎

  平成 28 年度宇宙輸送シンポジウム 非化学推進部門, 20 Jan. 2017, Japanese, Domestic conference

  Oral presentation

• Two Dimensional Plasma Characteristics by Rotating Magnetic Field Acceleration Method

  古川武留, 瀧澤耕平, 桑原大介, 篠原俊二郎

  33rd the Japan Society of Plasma Science and Nuclear Fusion Research Annual Meeting, 01 Dec. 2016, Japanese, Domestic conference

  Poster presentation

• Experiments on Electrodeless Plasma Acceleration by Rotating Magnetic Field in Divergent Magnetic Field

  瀧澤耕平, 古川武留, 桑原大介, 篠原俊二郎

  33rd the Japan Society of Plasma Science and Nuclear Fusion Research Annual Meeting, 01 Dec. 2016, Japanese, Domestic conference

  Poster presentation

• Study on Electromagnetic Plasma Acceleration Using Rotating Magnetic Field Scheme

  T. Furukawa, K. Takizawa, D. Kuwahara, S. Shinohara

  International Conference on Plasma Physics (ICPP) 2016, 11 Nov. 2016, English, International conference

  Oral presentation

• Electrodeless RF Propulsion by Rotating Magnetic Field Method

  T. Furukawa, K. Takizawa, D. Kuwahara, S. Shinohara

  58th Annual Meeting of the APS (American Physical Society) Division of Plasma Physics, 31 Oct. 2016, English, International conference

  Others

• Experiment on Electrodeless Plasma Acceleration by Rotating Magnetic Field Method

  瀧澤耕平, 古川武留, 西村修一, 桑原大介, 篠原俊二郎

  平成 27 年度宇宙輸送シンポジウム 非化学推進部門, 14 Jan. 2016, Japanese, Domestic conference

  Oral presentation

• Electrodeless Acceleration by Rotating Magnetic Field Method using High Density Helicon Plasma Source

  瀧澤耕平, 古川武留, 西村修一, 大塚修平, 桑原大介, 篠原俊二郎

  32nd the Japan Society of Plasma Science and Nuclear Fusion Research Annual Meeting, 26 Nov. 2015, Japanese, Domestic conference

  Poster presentation

Association Memberships

• THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

• Association of Asia Pacific Physical Societies (AAPPS)

• プラズマ核融合学会

• American Physical Society

Research Projects

• 時空間変動磁場下の微粒子プラズマの物理挙動解明と電磁加速型無電極推進への影響調査

  古川 武留

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists, Grant-in-Aid for Early-Career Scientists, Kobe University, Apr. 2022 - Mar. 2025

• Studies on temporal variation analysis of modulation effect and self-excitation in a traveling wave direct energy converter

  竹野 裕正, 古川 武留, 中本 聡

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2020 - Mar. 2024, Coinvestigator

  令和2年度は，3つの副課題を並行して進めた．進捗状況は８．で説明するが，予測しがたい研究環境の激変があり，それぞれの進捗に影響があった． 1)副課題1：可変径大口径イオン源の製作では，設計と一部部品の調達を行った．構造の概略設計を行い，プラズマ源としてφ100mm，長さ900mmのガラス管を用い，150Aステンレス管で800l/sの排気ポンプと接続する．ガスは，実績のあるピエゾバルブを利用して，パルス的に注入する．排気管には，エネルギー変換部との接続に用いる100Aの枝管を設ける．また，ビーム径は3枚のアパーチャで変化させることとし，同じく排気管を利用して設置する．磁場は7500ATのコイル6個を用い，最大600G以上の一様磁場を長さ50cm以上形成する． 2)副課題2：径方向散乱分析のための模擬実験については，感染症流行への対応で主担当者のエフォートを十分に確保できず，遅れが生じている．また，実験そのものにおいて，十分なビーム電流が得られず，電流増大に向けてイオン源のプラズマ発光強度とビーム電流との相関分析を行ったが，期待した相関を見いだせていない．プラズマ源内の磁場構造の見直しが必要と考えられる． 3)副課題4：模擬実験結果の数値解析では，既存の進行波型直接エネルギー変換器粒子軌道計算コードで粒子の散乱過程を扱える拡張を行う．主担当予定者が他機関へ異動して研究組織を離脱したため，計画に遅れが生じている．現在，元コードを拡張するコーディングの途上にある．

• 先進的無電極プラズマ電磁加速法の電磁加速力に支配的な条件解明に基づく設計理論構築

  古川 武留

  日本学術振興会, 科学研究費助成事業 若手研究, 若手研究, 東京農工大学, 01 Apr. 2020 - 31 Mar. 2022

• 高密度ヘリコンプラズマ源を用いた先進的無電極プラズマ加速法の研究開発

  古川 武留

  日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 特別研究員奨励費, 東京農工大学, 25 Apr. 2018 - 31 Mar. 2020, Principal investigator

  本研究で提案する次世代型無電極プラズマ加速法の一つである回転磁場（Rotating Magnetic Field: RMF）プラズマ加速法の原理実証のため、実験的アプローチにより加速効果の検証、加速メカニズムの解明を行うものである。プラズマ内部にRMFを印加し、非線形効果に起因する周方向電流を駆動する。この電流と外部発散磁場の径方向成分に起因する軸方向ローレンツ力によりプラズマを加速する。本加速スキームでは従来電気推進機にみられる電極損耗がなく、これによる推進効性能の低減、推進機寿命の制限等の問題が無いため、長期的深宇宙探査といった将来型宇宙開発での利用が期待されている。 採用第1年目では、RMFアンテナ領域におけるRMFの時間変動成分の時空間分布計測を行った。これにより、RMFのプラズマ中への浸透評価を実験的に行った。さらに、プラズマの非線形効果（ホール効果）に起因する印加電流周波数の2倍高調波成分を周波数解析により導出した。この2倍高調波成分磁場分布から、RMFアンテナ領域における時間変動周方向電流密度分布を算出した。さらに、RMFアンテナ内部の周方向電流及び軸方向ローレンツ力を評価し、RMF由来の電磁加速効果を確認した。 本研究では2組の対向コイルを用いて回転磁場を発生させるが、この対向コイル間の印加電流位相差を変化させることで、RMFの回転方向および振動方向を変化させることができる。RMF由来の周方向電流駆動実証のアプローチとして、RMFの回転方向を変化させた際の、周方向電流の駆動方向や強度依存を評価した。結果として、正の電磁加速力を発生させる位相差で、最大の周方向電流及び正の推力が得られ、RMF印加におけるプラズマ流れの制御及びRMF加速法による推力制御可能性も示唆された。

  Competitive research funding

• Improvement of completely electrodeless helicon plasma thruster using supersonic gas puffing

  KUWAHARA Daisuke, SHINOHARA shunjiro, FURUKAWA takeru, ISHIGAMI yuichi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), 01 Apr. 2016 - 31 Mar. 2019

  For a neutral particle depletion problem in a helicon plasma thruster, a supersonic gas puffing method and internal gas feeding method has been proposed. The proposed methods supply gas into the inner region of plasma directly. The main objective of these methods are to reduce the depletion of neutral particles in plasma. This phenomenon is considered to limit the increase of electron density. Therefore, the thrust increase, which is proportional to the electron density, is also limited. To address this issue, the proposed methods attempts to supply the neutral particles directly to the generation area of the plasma. In the case of the supersonic gas puffing method, a focusing gas beam can be generated. However, the amount of gas is too large compared to conventional thruster. The other hand, it's revealed that 51% increased reaction force has been obtained at a radio-frequency power of 3 kW and a gas feeding rate of 100 sccm (Ar) using the internal feeding method.