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  • Akihide Fujisawa
2019

Comparison of conditional average using threshold and template methods for quasi-periodic phenomena in plasmas

ASDEX Upgrade Team, Jan 1 2019, In : Plasma and Fusion Research. 14, 1402114.

Research output: Contribution to journalArticle

Open Access
2018

Symmetry-breaking of turbulence structure and position identification in toroidal plasmas

Itoh, K., Itoh, S. I., Nagashima, Y., Yamada, T., Kosuga, Y. & Fujisawa, A., Jan 1 2018, In : Plasma and Fusion Research. 13, 1102113.

Research output: Contribution to journalArticle

Open Access
2019
1 Citation (Scopus)

Roles of solitary eddy and splash in drift wave-zonal flow system in a linear magnetized plasma

Arakawa, H., Sasaki, M., Inagaki, S., Kosuga, Y., Kobayashi, T., Kasuya, N., Yamada, T., Nagashima, Y., Kin, F., Fujisawa, A., Itoh, K. & Itoh, S. I., May 1 2019, In : Physics of Plasmas. 26, 5, 052305.

Research output: Contribution to journalArticle

Open Access
2018

Spatio-temporal dynamics of turbulence trapped in geodesic acoustic modes

Sasaki, M., Kobayashi, T., Itoh, K., Kasuya, N., Kosuga, Y., Fujisawa, A. & Itoh, S. I., Jan 1 2018, In : Physics of Plasmas. 25, 1, 012316.

Research output: Contribution to journalArticle

9 Citations (Scopus)

Evaluation of measurement signal of heavy ion beam probe of energetic-particle driven geodesic acoustic modes

Sasaki, M., Itoh, K., Ido, T., Shimizu, A., Kobayashi, T., Arakawa, H., Kasuya, N., Fujisawa, A. & Itoh, S. I., Jan 1 2018, In : Plasma and Fusion Research. 13, 3403040.

Research output: Contribution to journalArticle

Open Access
2017

Phenomenological classification of turbulence states in linear magnetized plasma PANTA

Kobayashi, T., Inagaki, S., Sasaki, M., Kosuga, Y., Arakawa, H., Kin, F., Yamada, T., Nagashima, Y., Kasuya, N., Fujisawa, A., Itoh, S. I. & Itoh, K., Jan 1 2017, In : Plasma and Fusion Research. 12, 1401019.

Research output: Contribution to journalArticle

8 Citations (Scopus)
2019

Ion temperature measurement by laser-induced fluorescence spectroscopy in panta

Arakawa, H., Inagaki, S., Kosuga, Y., Sasaki, M., Kin, F., Hasamada, K., Yamasaki, K., Kobayashi, T., Yamada, T., Nagashima, Y., Fujisawa, A., Kasuya, N., Itoh, K. & Itoh, S. I., Oct 1 2019, In : IEEJ Transactions on Electrical and Electronic Engineering. 14, 10, p. 1450-1454 5 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)
2017

Measurement of thickness of film deposited on the plasma-facing wall in the QUEST tokamak by colorimetry

Wang, Z., Hanada, K., Yoshida, N., Shimoji, T., Miyamoto, M., Oya, Y., Zushi, H., Idei, H., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Kawasaki, S., Higashijima, A., Nakashima, H., Nagata, T., Kawaguchi, A., Fujiwara, T., Araki, K., Mitarai, O. & 3 others, Fukuyama, A., Takase, Y. & Matsumoto, K., Sep 1 2017, In : Review of Scientific Instruments. 88, 9, 093502.

Research output: Contribution to journalArticle

3 Citations (Scopus)
2018

Nonlinear characteristics of mediator and streamer in linear magnetized plasmas

Kin, F., Fujisawa, A., Itoh, K., Kosuga, Y., Sasaki, M., Yamada, T., Inagaki, S., Itoh, S. I., Kobayashi, T., Nagashima, Y., Kasuya, N., Arakawa, H., Yamasaki, K. & Hasamada, K., Jan 1 2018, 45th EPS Conference on Plasma Physics, EPS 2018. Berndt, J., Coda, S., Lapenta, G., Michaut, C., Weber, S. & Mantsinen, M. (eds.). European Physical Society (EPS), p. 565-568 4 p. (45th EPS Conference on Plasma Physics, EPS 2018; vol. 2018-July).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2020

Electron heating of over-dense plasma with dual-frequency electron cyclotron waves in fully non-inductive plasma ramp-up on the QUEST spherical tokamak

Idei, H., Onchi, T., Mishra, K., Zushi, H., Kariya, T., Imai, T., Watanabe, O., Ikezoe, R., Hanada, K., Ono, M., Ejiri, A., Qian, J., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Matsuoka, K., Fukuyama, A., Kubo, S., Yoshikawa, M. & 6 others, Sakamoto, M., Kawasaki, S., Higashijima, A., Ide, S., Takase, Y. & Murakami, S., Jan 1 2020, In : Nuclear Fusion. 60, 1, 016030.

Research output: Contribution to journalArticle

2018

Quantification of Turbulent Driving Forces for the Geodesic Acoustic Mode in the JFT-2M Tokamak

Kobayashi, T., Sasaki, M., Ido, T., Kamiya, K., Miura, Y., Nagashima, Y., Ida, K., Inagaki, S., Fujisawa, A., Itoh, S. I. & Itoh, K., Jan 26 2018, In : Physical Review Letters. 120, 4, 045002.

Research output: Contribution to journalArticle

8 Citations (Scopus)
2017

Fast algorithm for tomographic reconstruction for plasma emission

Yamasaki, K., Fujisawa, A., Nagashima, Y. & Inagaki, S., Jan 1 2017, In : Plasma and Fusion Research. 12, 1201045.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Spatial distribution of atomic and ion hydrogen flux and its effect on hydrogen recycling in long duration confined and non-confined plasmas

Kuzmin, A., Zushi, H., Takagi, I., Sharma, S. K., Kobayashi, M., Hirooka, Y., Onchi, T., Hanada, K., Yoshida, N., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Hasegawa, M., Mutoh, T., Mishra, K. & Ohwada, H., Aug 2017, In : Nuclear Materials and Energy. 12, p. 627-632 6 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak

Idei, H., Kariya, T., Imai, T., Mishra, K., Onchi, T., Watanabe, O., Zushi, H., Hanada, K., Qian, J., Ejiri, A., Alam, M. M., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Matsuoka, K., Fukuyama, A., Kubo, S., Shimozuma, T., Yoshikawa, M. & 8 others, Sakamoto, M., Kawasaki, S., Nakashima, H., Higashijima, A., Ide, S., Maekawa, T., Takase, Y. & Toi, K., Oct 5 2017, In : Nuclear Fusion. 57, 12, 126045.

Research output: Contribution to journalArticle

13 Citations (Scopus)
6 Citations (Scopus)
2018

Past and present experiments toward PLATO project

Fujisawa, A., Aug 1 2018, Front-runners' Symposium on Plasma Physics in Honor of Professors Kimitaka Itoh and Sanae-I. Itoh. Todo, Y. & Ida, K. (eds.). American Institute of Physics Inc., 020011. (AIP Conference Proceedings; vol. 1993).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)
2019

Study of turbulence intermittency in linear magnetized plasma

Zhang, B., Inagaki, S., Hasamada, K., Yamasaki, K., Kin, F., Nagashima, Y., Yamada, T. & Fujisawa, A., Oct 7 2019, In : Plasma Physics and Controlled Fusion. 61, 11, 115010.

Research output: Contribution to journalArticle

Open Access
2017

Permutation entropy and statistical complexity in characterising low-aspect-ratio reversed-field pinch plasma

Onchi, T., Fujisawa, A., Sanpei, A., Himura, H. & Masamune, S., Apr 6 2017, In : Physica Scripta. 92, 5, 055601.

Research output: Contribution to journalArticle

1 Citation (Scopus)
2018

Density profile measurement with a heavy ion beam probe in a toroidal plasma of the compact helical system

Shimizu, A., Fujisawa, A., Ohshima, S., Nakano, H., Minami, T., Isobe, M., Okamura, S. & Matsuoka, K., Nov 1 2018, In : Review of Scientific Instruments. 89, 11, 113507.

Research output: Contribution to journalArticle

2 Citations (Scopus)
2017

Investigation of hydrogen recycling in long-duration discharges and its modification with a hot wall in the spherical tokamak QUEST

Hanada, K., Yoshida, N., Honda, T., Wang, Z., Kuzmin, A., Takagi, I., Hirata, T., Oya, Y., Miyamoto, M., Zushi, H., Hasegawa, M., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Watanabe, O., Onchi, T., Kuroda, K., Long, H., Watanabe, H. & 7 others, Tokunaga, K., Higashijima, A., Kawasaki, S., Nagata, T., Takase, Y., Fukuyama, A. & Mitarai, O., Oct 26 2017, In : Nuclear Fusion. 57, 12, 126061.

Research output: Contribution to journalArticle

11 Citations (Scopus)
2018

Spatio-temporal dynamics of turbulence coupling with zonal flows

Sasaki, M., Kobayashi, T., Itoh, K., Kasuya, N., Kosuga, Y., Fujisawa, A., Inagaki, S. & Itoh, S. I., Jan 1 2018, 45th EPS Conference on Plasma Physics, EPS 2018. Berndt, J., Coda, S., Lapenta, G., Michaut, C., Weber, S. & Mantsinen, M. (eds.). European Physical Society (EPS), p. 449-452 4 p. (45th EPS Conference on Plasma Physics, EPS 2018; vol. 2018-July).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Effect of magnetic shear on edge turbulence in SOL-like open field line configuration in QUEST

Banerjee, S., Zushi, H., Nishino, N., Hanada, K., Idei, H., Nakamura, K., Hasegawa, M., Fujisawa, A., Nagashima, Y., Mishra, K., Tashima, S., Onchi, T., Kuzmin, A. & Matsuoka, K., Jun 28 2018, In : Plasma Physics and Controlled Fusion. 60, 8, 085014.

Research output: Contribution to journalArticle

2017

Coexistence of driftwaves and d'angelo modes at different position and frequency in linear plasma device

Dupertuis, N., Inagaki, S., Nagashima, Y., Kosuga, Y., Kin, F., Kobayashi, T., Kasuya, N., Sasaki, M., Fujisawa, A., Tran, M. Q., Itoh, S. I. & Itoh, K., Jan 1 2017, In : Plasma and Fusion Research. 12, 1201008.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Plasma equilibrium based on RF-driven current profile without assuming nested magnetic surfaces on QUEST

Nakamura, K., Alam, M. M., Jiang, Y. Z., Mitarai, O., Kurihara, K., Kawamata, Y., Sueoka, M., Takechi, M., Hasegawa, M., Tokunaga, K., Araki, K., Zushi, H., Hanada, K., Fujisawa, A., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H., Higashijima, A., Nagata, T. & 1 others, Fukuyama, A., Nov 2017, In : Fusion Engineering and Design. 123, p. 532-534 3 p.

Research output: Contribution to journalArticle

Temporal-spatial structures of plasmas flows and turbulence around tearing mode islands in the edge tokamak plasmas

Zhao, K. J., Nagashima, Y., Li, F. M., Shi, Y., Diamond, P. H., Dong, J. Q., Itoh, K., Itoh, S. I., Zhuang, G., Liu, H., Chen, Z. P., Cheng, J., Nie, L., Ding, Y. H., Hu, Q. M., Chen, Z. Y., Rao, B., Cheng, Z. F., Gao, L., Zhang, X. Q. & 12 others, Yang, Z. J., Wang, N. C., Wang, L., Jin, W., Yan, W., Xu, J. Q., Wu, Y. F., Yan, L. W., Fujisawa, A., Inagaki, S., Kosuga, Y. & Sasaki, M., Sep 12 2017, In : Nuclear Fusion. 57, 12, 126006.

Research output: Contribution to journalArticle

6 Citations (Scopus)
2018

Extraction of nonlinear waveform in turbulent plasma

Kin, F., Itoh, K., Fujisawa, A., Kosuga, Y., Sasaki, M., Yamada, T., Inagaki, S., Itoh, S. I., Kobayashi, T., Nagashima, Y., Kasuya, N., Arakawa, H., Yamasaki, K. & Hasamada, K., Jun 1 2018, In : Physics of Plasmas. 25, 6, 062304.

Research output: Contribution to journalArticle

5 Citations (Scopus)
2019

Estimation of particle flux driven by coherent mode using of statistical conditional averaging

Kawachi, Y., Inagaki, S., Hasamada, K., Yamasaki, K., Kin, F., Kosuga, Y., Sasaki, M., Nagashima, Y., Kasuya, N., Yamada, T., Zhang, B. & Fujisawa, A., Jan 1 2019, In : Plasma and Fusion Research. 14, 1402090.

Research output: Contribution to journalArticle

Open Access
2017

Turbulent transport reduction induced by transition on radial electric field shear and curvature through amplitude and cross-phase in torus plasma

Kobayashi, T., Itoh, K., Ido, T., Kamiya, K., Itoh, S. I., Miura, Y., Nagashima, Y., Fujisawa, A., Inagaki, S. & Ida, K., Dec 1 2017, In : Scientific reports. 7, 1, 14971.

Research output: Contribution to journalArticle

10 Citations (Scopus)

Model validation for radial electric field excitation during L-H transition in JFT-2M tokamak

Kobayashi, T., Itoh, K., Ido, T., Kamiya, K., Itoh, S. I., Miura, Y., Nagashima, Y., Fujisawa, A., Inagaki, S., Ida, K. & Hoshino, K., Mar 10 2017, In : Nuclear Fusion. 57, 7, 072005.

Research output: Contribution to journalArticle

1 Citation (Scopus)
2018

Determination of spatiotemporal structure of fluctuations by statistical averaging method

Kawachi, Y., Inagaki, S., Tomita, K., Yamasaki, K., Kin, F., Kosuga, Y., Sasaki, M., Nagashima, Y., Kasuya, N., Hasamada, K., Zhang, B. & Fujisawa, A., Jan 1 2018, In : Plasma and Fusion Research. 13, 3401105.

Research output: Contribution to journalArticle

Open Access
3 Citations (Scopus)
2020
2017

Nonlinear coupling of driftwaves and high frequency fluctuation on PANTA

Hasamada, K., Kosuga, Y., Kin, F., Inagaki, S., Nagashima, Y., Kobayashi, T., Sasaki, M., Kasuya, N., Yamasaki, K., Itoh, S. I., Itoh, K. & Fujisawa, A., Jan 1 2017, In : Plasma and Fusion Research. 12, 1201034.

Research output: Contribution to journalArticle

2018

Experimental research plan of nonlinearity of tokamak edge turbulence in plasma turbulence observatory

Nagashima, Y. & Fujisawa, A., Aug 1 2018, Front-runners' Symposium on Plasma Physics in Honor of Professors Kimitaka Itoh and Sanae-I. Itoh. Todo, Y. & Ida, K. (eds.). American Institute of Physics Inc., 020006. (AIP Conference Proceedings; vol. 1993).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2017

Mesoscale electric fluctuations interacting with zonal flows, magnetic fluctuations and turbulence

HL-2A team, Jun 5 2017, In : Nuclear Fusion. 57, 7, 076036.

Research output: Contribution to journalArticle

2019

Spatial structure of low-frequency fluctuations throughout the transition of poloidal flow velocity in edge plasmas of LHD

Moon, C., Kobayashi, T., Ida, K., Tokuzawa, T., Hidalgo, C., Yoshinuma, M., Ogawa, K., Itoh, K. & Fujisawa, A., Sep 1 2019, In : Physics of Plasmas. 26, 9, 092302.

Research output: Contribution to journalArticle

Open Access
2018

Three-dimensional structure of the streamer in linear plasmas

Yamada, T., Inagaki, S., Sasaki, M., Nagashima, Y., Kin, F., Arakawa, H., Kobayashi, T., Yamasaki, K., Kasuya, N., Kosuga, Y., Fujisawa, A., Itoh, K. & Itoh, S. I., Jan 1 2018, In : journal of the physical society of japan. 87, 3, 034501.

Research output: Contribution to journalArticle

1 Citation (Scopus)
2019

Observations of radially elongated particle flux induced by streamer in a linear magnetized plasma

Kin, F., Fujisawa, A., Itoh, K., Kosuga, Y., Sasaki, M., Inagaki, S., Nagashima, Y., Yamada, T., Kasuya, N., Yamasaki, K., Hasamada, K., Zhang, B. Y., Kawachi, Y., Arakawa, H., Kobayashi, T. & Itoh, S. I., Apr 1 2019, In : Physics of Plasmas. 26, 4, 042306.

Research output: Contribution to journalArticle

2 Citations (Scopus)
2017

Topological bifurcation of helical flows in magnetized plasmas with density gradient and parallel flow shear

Sasaki, M., Kasuya, N., Itoh, K., Toda, S., Yamada, T., Kosuga, Y., Nagashima, Y., Kobayashi, T., Arakawa, H., Yamasaki, K., Fujisawa, A., Inagaki, S. & Itoh, S. I., Nov 1 2017, In : Physics of Plasmas. 24, 11, 112103.

Research output: Contribution to journalArticle

10 Citations (Scopus)
2018
3 Citations (Scopus)

Propagation direction of geodesic acoustic modes driven by drift wave turbulence

Sasaki, M., Itoh, K., Kobayashi, T., Kasuya, N., Fujisawa, A. & Itoh, S. I., Oct 3 2018, In : Nuclear Fusion. 58, 11, 112005.

Research output: Contribution to journalArticle

3 Citations (Scopus)
2017

Multiple-instabilities in magnetized plasmas with density gradient and velocity shears

Sasaki, M., Kasuya, N., Toda, S., Yamada, T., Kosuga, Y., Arakawa, H., Kobayashi, T., Inagaki, S., Fujisawa, A., Nagashima, Y., Itoh, K. & Itoh, S. I., Jan 1 2017, In : Plasma and Fusion Research. 12, 1401042.

Research output: Contribution to journalArticle

4 Citations (Scopus)