Measurement of temporal evolution of wavenumber spectrum of plasma turbulence

• Project/Area Number: 15K14283
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: Kyushu University
• Principal Investigator: INAGAKI SHIGERU 九州大学, 応用力学研究所, 教授 (60300729)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: プラズマ乱流 / マイクロ波工学 / リモートセンシング / マイクロ波散乱 / 周波数コム

Outline of Final Research Achievements

We have developed a microwave frequency comb scattering measurement to observe temporal behavior of wavenumber spectrum of turburent fluctuation in magnetized plasma. We have applied this method to density fluctuation measurement in the linear magnetized plasma device (PANTA) in Kyushu University. Here multi-wavenumber measurement is realized by using ultra-fast digital storage oscilloscope and digital Fourier transform technique instead of the frequency filter-bank. We have succeeded to observe a temporal evolution of wave-number resolved scattered signal in PANTA. This method is expected to be applied in various microwave sensing techniques for plasma diagnostics.

Research Products

• [Int'l Joint Research] Southwestern Institute of Physics(中国)
• [Journal Article] Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas (2017)
  • Author(s): Kobayashi T.、Ida K.、Inagaki S.、Tsuchiya H.、Tamura N.、Choe G.H.、Yun G.S.、Park H.K.、Ko W.H.、Evans T.E.、Austin M.E.、Shafer M.W.、Ono M.、L?pez-bruna D.、Ochando M.A.、Estrada T.、Hidalgo C.、Moon C.、Igami H.、Yoshimura Y.、Tsujimura T.Ii.、Itoh S.-I.、Itoh K.
  • Journal Title: Nucl. Fusion Volume: 57 Pages: 076013-076013
  • DOI: 10.1088/1741-4326/aa6f1f
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Method for Estimating Harmonic Frequency Dependence of Diffusion Coefficient and Convective Velocity in Heat Pulse Propagation Experiment (2017)
  • Author(s): Tatsuya Kobayashi, Kimitaka Itoh, Katsumi Ida, Shigeru Inagaki, Sanae-I. Itoh
  • Journal Title: J. Phys. Soc. Jpn. Volume: 86 Issue: 7 Pages: 074501-074501
  • DOI: 10.7566/jpsj.86.074501
  • NAID: 40021254128
  • ISSN: 0031-9015, 1347-4073
  • Peer Reviewed
• [Journal Article] Hysteresis and fast timescales in transport relations of toroidal plasmas (2017)
  • Author(s): K. Itoh, S.-I. Itoh, K. Ida, S. Inagaki, Y. Kamada, K. Kamiya, J. Dong, C. Hidalgo, T. Evans, W. Ko, H. Park, T. Tokuzawa, S. Kubo, T. Kobayashi, Y. Kosuga, M. Sasaki, G. Yun, S. Song, N. Kasuya, Y. Nagashima, C. Moon, M. Yoshinuma, R. Makino, T. Tsujimura, H. Tsuchiya, U. Stroth
  • Journal Title: Nucl. Fusion Volume: 57 Pages: 1020211-7
  • DOI: 10.1088/1741-4326/aa796a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Phenomenological classification of turbulence states in linear magnetized plasma PANTA (2017)
  • Author(s): T. Kobayashi, S. Inagaki, M. Sasaki, Y. Kosuga, H. Arakawa, F. Kin, T. Yamada, Y. Nagashima, N. Kasuya, A. Fujisawa, S.-I. Itoh, K. Itoh
  • Journal Title: Plasma and Fusion Researc Volume: in press
  • NAID: 130006897725
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Response of plasma toroidal flow to the transition between nested and stochastic magnetic field in LHD (2017)
  • Author(s): K. Ida, M. Yoshinuma, H. Tsuchiya, T. Kobayashi, C. Suzuki, M. Yokoyama, A. Shimizu, K. Nagaoka, S. Inagaki, K. Itoh
  • Journal Title: Nuclear Fusion Volume: in press
  • Peer Reviewed
• [Journal Article] Distorted magnetic island formation during slowing down to mode locking in helical plasmas (2017)
  • Author(s): T. Tokuzawa, Y. Takemura, K. Y. Watanabe, S. Sakakibara, Y. Narushima, H. Tsuchiya, Y. Nagayama, S. Inagaki, K. Ida, M. Yoshinuma, K. Tanaka, Y. Suzuki, I. Yamada
  • Journal Title: Nuclear Fusion Volume: in press
  • Peer Reviewed
• [Journal Article] Reconstruction of high temporal resolution Thomson scattering data during a modulated electron cyclotron resonance heating using conditional averaging (2016)
  • Author(s): T. Kobayashi, K. Ida, K. Itoh, M. Yoshinuma, C. Moon, S. Inagaki, I. Yamada, H. Funaba, R. Yasuhara, S. Ohdachi, Y. Yoshimura, H. Igami, T. Shimozuma, S. Kubo, T. I. Tsujimura and LHD experiment group
  • Journal Title: Review of Scientific Instruments Volume: 87 Pages: 043505-043505
  • DOI: 10.1063/1.4945258
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Tomography as a promising diagnostic tool for plasma turbulence (2016)
  • Author(s): A. Fujisawa, Y. Nagashima, S. Inagaki, T. Onchi, S. Ohshima, A. Shimizu
  • Journal Title: Plasma Physics and Controlled Fusion Volume: 58 Pages: 025005-025005
  • DOI: 10.1088/0741-3335/58/2/025005
  • Peer Reviewed
• [Journal Article] On the Study of Higher Harmonics of Heat Pulse Propagation in the Modulated-Heating Experiments (2016)
  • Author(s): K. Itoh, S.-I. Itoh, S. Inagaki, N. Kasuya, A. Fujisawa
  • Journal Title: J. Phys. Soc. Jpn. Volume: 85 Issue: 1 Pages: 014501-014501
  • DOI: 10.7566/jpsj.85.014501
  • NAID: 210000133799
  • ISSN: 0031-9015, 1347-4073
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Strong Destabilization of Stable Modes with a Half- Frequency Associated with Chirping Geodesic Acoustic Modes in the Large Helical Device (2016)
  • Author(s): T. Ido, K. Itoh, M. Osakabe, M. Lesur, A. Shimizu, K. Ogawa, K. Toi, M. Nishiura, S. Kato, M. Sasaki, K. Ida, S. Inagaki, S.-I. Itoh, and the LHD Experiment Group
  • Journal Title: Phys. Rev. Lett. Volume: 116 Pages: 015002-015002
  • DOI: 10.1103/physrevlett.116.015002
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Observation of Parallel Force Balance for Drift Wave Fluctuation by a Fast Voltage Sweeping Method in a Linear Plasma (2015)
  • Author(s): Yoshihiko Nagashima, Shigeru Inagaki, Akihide Fujisawa, Hiroyuki Arakawa, Takuma Yamada, Yudai Miwa, Tatsuya Kobayashi, Sanae-I. Itoh, and Kimitaka Itoh
  • Journal Title: J. Phys. Soc. Jpn. Volume: 84 Issue: 6 Pages: 063501-063501
  • DOI: 10.7566/jpsj.84.063501
  • NAID: 210000133566
  • ISSN: 0031-9015, 1347-4073
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Experimental Study of Perturbative Particle Transport in the HL-2A Tokamak (2017)
  • Author(s): B. Y. Zhang, S. Inagaki, Z. B. Shi, W. L. Zhong, X. L. Zou, M. Jiang, Z. C. Yang, P. W. Shi, C. Y. Chen, G. L. Xiao, B. B. Feng, X. M. Song
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪大学
  • Year and Date: 2017-03-17
• [Presentation] Experimental study of turbulence and instabilities with comb microwave reflectometer in PANTA (2017)
  • Author(s): Z. Boyu, S. Inagaki, et. al.,
  • Organizer: 1st Asia-Pacific Conference on Plasma Physics
  • Int'l Joint Research
• [Presentation] Measurement of electron density profile and turbulence with comb microwave reflectometer in PANTA (2017)
  • Author(s): Z. Boyu, S. Inagaki, et. al.,
  • Organizer: 7th Asia-Pacific Transport Working Group Meeting
  • Int'l Joint Research
• [Presentation] Measurement of Azimuthal Velocity Fluctuation by a Microwave Frequency Comb Doppler Backscattering in PANTA (2016)
  • Author(s): R. Minato, S. Inagaki, T. Mizokami, F. Kin, T. Tokuzawa, Y. Nagashima, T. Yamada, A. Fujisawa, N. Kasuya, S.-I. Itoh, K. Itoh
  • Organizer: プラズマ核融合学会九州沖縄山口支部支部会
  • Place of Presentation: 九州大学
  • Year and Date: 2016-12-17
• [Presentation] Influence of Neutral Particle on Plasma Flow in PANTA (2016)
  • Author(s): H. Taguma, S. Inagaki, F. Kin, M. Sasaki, Y. Kosuga, K. hasamada, T. Kanzaki, R. Minato, I. Fukuda
  • Organizer: プラズマ核融合学会九州沖縄山口支部支部会
  • Place of Presentation: 九州大学
  • Year and Date: 2016-12-17
• [Presentation] Measurement of Azimuthal Velocity with a Microwave Frequency Comb Doppler Backscattering in PANTA (2016)
  • Author(s): R. Minato, S. Inagaki, T. Mizokami, F. Kin, T. Tokuzawa, Y. Nagashima, T. Yamada, A. Fujisawa, N. Kasuya, S.-I. Itoh, K. Itoh
  • Organizer: 第33回プラズマ核融合学会年会
  • Place of Presentation: 東北大学
  • Year and Date: 2016-11-29
• [Presentation] Cross-Scale Coupling in Magnetized Turbulent Plasma (2016)
  • Author(s): S. Inagaki
  • Organizer: 日本物理学会2016年春季大会
  • Place of Presentation: 東北学院大
  • Year and Date: 2016-03-19
• [Presentation] Measurement by a Microwave Frequency Comb Reflectometer in PANTA (2015)
  • Author(s): T. Mizokami, S. Inagaki, R. Minato, T. Tokuzawa, Y. Nagashima, T. Yamada, H. Arakawa, N. Kasuya, A. Fujisawa, M. Sasaki, Y. Kosuga, K. Itoh, S.-I. Itoh
  • Organizer: The 17th Cross Straits Symposium on Energy and Environmental Science and Technology
  • Place of Presentation: 九州大学
  • Year and Date: 2015-12-02
  • Int'l Joint Research
• [Presentation] 核融合研究における主幹プロジェクトの現状と小型炉への要望 (2015)
  • Author(s): S. Inagaki
  • Organizer: 第32回プラズマ核融合学会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2015-11-24
• [Presentation] Evaluation of flow velocity with a frequency comb Doppler Backscattering in PANTA (2015)
  • Author(s): R. Minato, S. Inagaki, T. Mizokami, T. Yamada, Y. Nagashima, T. Tokuzawa, Y. Miwa, F. Kin, A. Fujisawa, N. Kasuya, K. Itoh, S.-I. Itoh
  • Organizer: 25th International Toki Conference
  • Place of Presentation: 土岐
  • Year and Date: 2015-11-03
  • Int'l Joint Research