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Author

  • Akihide Fujisawa
Article

A calibration of setting of mach probes by observing GAM oscillations

Itoh, K., Zhao, K., Dong, J., Itoh, S. I., Fujisawa, A., Inagaki, S., Sasaki, M., Nagashima, Y., Kosuga, Y., Cheng, J. & Kobayashi, T., Jan 1 2016, In : Plasma and Fusion Research. 11, 1402002.

Research output: Contribution to journalArticle

2 Citations (Scopus)

A Concept of Cross-Ferroic Plasma Turbulence

Inagaki, S., Kobayashi, T., Kosuga, Y., Itoh, S. I., Mitsuzono, T., Nagashima, Y., Arakawa, H., Yamada, T., Miwa, Y., Kasuya, N., Sasaki, M., Lesur, M., Fujisawa, A. & Itoh, K., Feb 26 2016, In : Scientific reports. 6, 22189.

Research output: Contribution to journalArticle

45 Citations (Scopus)

Adaptive-Array electron cyclotron emission diagnostics using data streaming in a software defined radio system

Idei, H., Mishra, K., Yamamoto, M. K., Hamasaki, M., Fujisawa, A., Nagashima, Y., Hayashi, Y., Onchi, T., Hanada, K. & Zushi, H., Apr 14 2016, In : Journal of Instrumentation. 11, 4, C04010.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Analysis of plasma equilibrium based on orbit-driven current density profile in steady-state plasma 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., Jan 1 2016, In : Fusion Engineering and Design. 109-111, p. 1528-1533 6 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Analysis of PWI footprint traces and material damage on the first walls of the spherical tokamak QUEST

Sharma, S. K., Zushi, H., Yoshida, N., Watanabe, H., Osakabe, M., Takeri, Y., Hasegawa, M., Tanabe, T., Tokunaga, K., Hanada, K., Idei, H., Sakamoto, M., Nakamura, K., Fujisawa, A., Ishiguro, M. & Tashima, S., Jan 1 2012, In : Fusion Engineering and Design. 87, 1, p. 77-86 10 p.

Research output: Contribution to journalArticle

16 Citations (Scopus)

Analytical solution of high βp equilibria with natural inboard poloidal null configuration obtained in the spherical tokamak QUEST

QUEST Team, Jan 1 2014, In : Plasma and Fusion Research. 9, SpecialIssue2, 3402093.

Research output: Contribution to journalArticle

4 Citations (Scopus)

An assessment of limit cycle oscillation dynamics prior to L-H transition

Itoh, K., Itoh, S. I. & Fujisawa, A., Jan 1 2013, In : Plasma and Fusion Research. 8, 1102168.

Research output: Contribution to journalArticle

17 Citations (Scopus)

A plasma shape identification with magnetic analysis for the real-time control on QUEST

Hasegawa, M., Nakamura, K., Tokunaga, K., Zushi, H., Hanada, K., fujisawa, A., Idei, H., Kawasaki, S., Nakashima, H. & Higashijima, A., Oct 5 2012, In : IEEJ Transactions on Fundamentals and Materials. 132, 7

Research output: Contribution to journalArticle

13 Citations (Scopus)
7 Citations (Scopus)

A prototype diagnostics system to detect ultraviolet emission for plasma turbulence

Onchi, T., Fujisawa, A. & Sanpei, A., Nov 1 2014, In : Review of Scientific Instruments. 85, 11, 113502.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Azimuthal inhomogeneity of turbulence structure and its impact on intermittent particle transport in linear magnetized plasmas

Kobayashi, T., Inagaki, S., Sasaki, M., Kosuga, Y., Arakawa, H., Yamada, T., Nagashima, Y., Miwa, Y., Kasuya, N., Fujisawa, A., Itoh, S. I. & Itoh, K., Nov 2015, In : Physics of Plasmas. 22, 11, 112301.

Research output: Contribution to journalArticle

6 Citations (Scopus)

Bi-coherence analysis of fluctuations with long distance correlation in toroidal plasmas

Shigeru, I., Kobayashi, T., Itoh, K., Tokuzawa, T., Itoh, S., Ida, K., Tamura, N., Kasuya, N., fujisawa, A., Kubo, S., Shimozuma, T., Yagi, M., Tanaka, K., Nagayama, Y., Kawahata, K. & Yamada, H., Mar 1 2012, In : journal of the physical society of japan. 81, 3, 034501.

Research output: Contribution to journalArticle

6 Citations (Scopus)

Changes of particle flux during end-plate biasing experiment in PANTA

Kin, F., Yamada, T., Inagaki, S., Nagashima, Y., Arakawa, H., Kobayashi, T., Miwa, Y., Kasuya, N., Sasaki, M., Kosuga, Y., Fujisawa, A., Itoh, K. & Itoh, S. I., Sep 15 2016, In : journal of the physical society of japan. 85, 9, 093501.

Research output: Contribution to journalArticle

2 Citations (Scopus)

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)

Comparative studies of inner and outer divertor discharges and a fueling study in QUEST

QUEST group, Jan 1 2016, In : Fusion Engineering and Design. 109-111, p. 1365-1370 6 p.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Comparison between non-inductive plasma current start-up using ECRH with and without fundamental resonance on QUEST

Miura, H., Hanada, K., Zushi, H., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Hasegawa, M., Nakashima, H., Kawasaki, S., Higashijima, A., Mitarai, O., Fukuyama, A. & Takase, Y., 2015, In : Plasma and Fusion Research. 10, 3402066.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Comparison of current density profiles based on particle orbit-driven current in steady-state plasma on QUEST

Alam, M. M., Nakamura, K., Xia, F., Mitarai, O., Hasegawa, M., Tokunaga, K., Araki, K., Zushi, H., Hanada, K., Fujisawa, A., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H., Higashijima, A. & Nagata, T., Jan 1 2016, In : Fusion Engineering and Design. 109-111, p. 1624-1630 7 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Configuration of flows in a cylindrical plasma device

Oldenbürger, S., Uriu, K., Kobayashi, T., Inagaki, S., Sasaki, M., Nagashima, Y., Yamada, T., Fujisawa, A., Itoh, S. I. & Itoh, K., Dec 1 2012, In : Plasma and Fusion Research. 7, SPL.ISS.1, 2401146.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Cross-field motion of plasma blob-filaments and related particle flux in an open magnetic field line configuration on QUEST

Liu, H. Q., Hanada, K., Nishino, N., Ogata, R., Ishiguro, M., Gao, X., Zushi, H., Nakamura, K., Fujisawa, A., Idei, H. & Hasegawa, M., Jan 1 2013, In : Journal of Nuclear Materials. 438, SUPPL, p. S513-S517

Research output: Contribution to journalArticle

2 Citations (Scopus)

Current status and prospect of plasma control system for steady-state operation on QUEST

Hasegawa, M., Nakamura, K., Zushi, H., Hanada, K., Fujisawa, A., Tokunaga, K., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H. & Higashijima, A., Nov 15 2016, In : Fusion Engineering and Design. 112, p. 699-702 4 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)

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)

Design and Implementation of DC Pulsed Power Supply Employing Self-Excited Induction Generators and Flywheels for Toroidal Field Coils of a Tokamak Device, PLATO

Murayama, M., Kato, S., Fujisawa, A., Matsuoka, K., Tsutsui, H., Tsuji-Iio, S. & Shimada, R., Jun 2020, In : IEEE Transactions on Applied Superconductivity. 30, 4, 9042294.

Research output: Contribution to journalArticle

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
5 Citations (Scopus)

Development of a high-performance control system by decentralization with reflective memory on QUEST

Hasegawa, M., Nakamura, K., Zushi, H., Hanada, K., Fujisawa, A., Mitarai, O., Tokunaga, K., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H. & Higashijima, A., Oct 1 2015, In : Fusion Engineering and Design. 96-97, p. 629-632 4 p.

Research output: Contribution to journalArticle

6 Citations (Scopus)

Development of a plasma control system for steady-state operation on QUEST

Hasegwa, M., Nakamura, K., Zushi, H., Hanada, K., Fujisawa, A., Matsuoka, K., Idei, H., Nagashima, Y., Tokunaga, K., Kawasaki, S., Nakashima, H. & Higashijima, A., Jan 1 2014, In : Journal of the Korean Physical Society. 65, 8, p. 1191-1195 5 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Development of plasma control system for divertor configuration on QUEST

Hasegawa, M., Nakamura, K., Zushi, H., Hanada, K., Fujisawa, A., Matsuoka, K., Mitarai, O., Idei, H., Nagashima, Y., Tokunaga, K., Kawasaki, S., Nakashima, H. & Higashijima, A., Apr 10 2013, In : Fusion Engineering and Design. 88, 6-8, p. 1074-1077 4 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Development of radially movable multichannel Reynolds stress probe system for a cylindrical laboratory plasma

Nagashima, Y., Inagaki, S., Kamakaki, K., Arakawa, H., Yamada, T., Shinohara, S., Kawai, Y., Yagi, M., Fujisawa, A., Itoh, S. I., Itoh, K. & Takase, Y., Mar 1 2011, In : Review of Scientific Instruments. 82, 3, 033503.

Research output: Contribution to journalArticle

10 Citations (Scopus)

Direct measurement of energetic electron flow in Q-shu University experiment with steady-state spherical tokamak

Ishiguro, M., Hanada, K., Liu, H., Zushi, H., Yoshida, N., Tokunaga, T., Nakamura, K., Fujisawa, A., Idei, H., Sakamoto, M., Hasegawa, M., Tashima, S., Takase, Y., Maekawa, T., Kishimoto, Y., Mitarai, O., Kawasaki, S., Nakashima, H. & Higashijima, A., Nov 1 2011, In : Review of Scientific Instruments. 82, 11, 113509.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Dynamical programming based turbulence velocimetry for fast visible imaging of tokamak plasma

Banerjee, S., Zushi, H., Nishino, N., Mishra, K., Onchi, T., Kuzmin, A., Nagashima, Y., Hanada, K., Nakamura, K., Idei, H., Hasegawa, M. & Fujisawa, A., Mar 1 2015, In : Review of Scientific Instruments. 86, 3, 033505.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Dynamic interaction between a solitary drift wave structure and zonal flows in a linear cylindrical device

Arakawa, H., Kobayashi, T., Shigeru, I., Kasuya, N., Oldenbürger, S., Nagashima, Y., Yamada, T., Yagi, M., fujisawa, A., Itoh, K. & Itoh, S., Nov 1 2011, In : Plasma Physics and Controlled Fusion. 53, 11, 115009.

Research output: Contribution to journalArticle

14 Citations (Scopus)

Dynamics of edge limit cycle oscillation in the JFT-2M Tokamak

Kobayashi, T., Itoh, K., Ido, T., Kamiya, K., Itoh, S. I., Miura, Y., Nagashima, Y., Fujisawa, A., Inagaki, S., Ida, K., Kasuya, N. & Hoshino, K., Jul 2014, In : Nuclear Fusion. 54, 7, 073017.

Research output: Contribution to journalArticle

19 Citations (Scopus)

Dynamics of particle flux in a cylindrical magnetized plasma

Oldenbürger, S., Inagaki, S., Kobayashi, T., Arakawa, H., Ohyama, N., Kawashima, K., Tobimatsu, Y., Fujisawa, A., Itoh, K. & Itoh, S. I., May 1 2012, In : Plasma Physics and Controlled Fusion. 54, 5, 055002.

Research output: Contribution to journalArticle

26 Citations (Scopus)

ECW/EBW heating and current drive experiment results and prospects for CW operation in QUEST

Idei, H., Zushi, H., Hanada, K., Kalinnikova, E., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Matsuoka, K., Kariya, T., Imai, T., Minami, R., Yoshida, N., Sakamoto, M., Watanabe, H., Tokunaga, K., Ejiri, A., Sakaguchi, M., Ishiguro, M., Tashima, S. & 15 others, Fukuyama, A., Igami, H., Kubo, S., Isobe, M., Nagaoka, K., Nakanishi, H., Nishino, N., Kawasaki, S., Nakashima, H., Higashijima, A., Takase, Y., Maekawa, T., Mitarai, O., Kikuchi, M. & Toi, K., Dec 1 2012, In : Plasma and Fusion Research. 7, SPL.ISS.1, 2402112.

Research output: Contribution to journalArticle

10 Citations (Scopus)

Eddy, drift wave and zonal flow dynamics in a linear magnetized plasma

Arakawa, H., Inagaki, S., Sasaki, M., Kosuga, Y., Kobayashi, T., Kasuya, N., Nagashima, Y., Yamada, T., Lesur, M., Fujisawa, A., Itoh, K. & Itoh, S. I., Sep 15 2016, In : Scientific reports. 6, 33371.

Research output: Contribution to journalArticle

14 Citations (Scopus)

Eddy current-adjusted plasma shape reconstruction by Cauchy condition surface method on QUEST

Nakamura, K., Jiang, Y., Liu, X. L., Mitarai, O., Kurihara, K., Kawamata, Y., Sueoka, M., Hasegawa, M., Tokunaga, K., Zushi, H., Hanada, K., Fujisawa, A., Sakamoto, M., Idei, H., Kawasaki, S., Nakashima, H., Higashijima, A. & Araki, K., Oct 1 2011, In : Fusion Engineering and Design. 86, 6-8, p. 1080-1084 5 p.

Research output: Contribution to journalArticle

6 Citations (Scopus)

Edge plasma dynamics during L-H transition in the 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., Jun 1 2015, In : Nuclear Fusion. 55, 6, 063009.

Research output: Contribution to journalArticle

6 Citations (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

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., 2020, In : Nuclear Fusion. 60, 1, 016030.

Research output: Contribution to journalArticle

1 Citation (Scopus)

End plate biasing experiments in linear magnetized plasmas

Yamada, T., Shigeru, I., Kobayashi, T., Nagashima, Y., Mitsuzono, T., Miwa, Y., Nakanishi, K., Fujino, H., Sasaki, M., Kasuya, N., Lesur, M., Kosuga, Y., fujisawa, A., Itoh, S. & Itoh, K., Nov 1 2014, In : Nuclear Fusion. 54, 11, 114010.

Research output: Contribution to journalArticle

7 Citations (Scopus)

Evaluation of electron temperature fluctuations using a conditional technique

Yamada, S., Inagaki, S., Oldenbürger, S., Kobayashi, T., Kawashima, K., Ohyama, N., Tobimatsu, Y., Arakawa, H., Nagashima, Y., Yamada, T., Sasaki, M., Yagi, M., Kasuya, N., Fujisawa, A., Itoh, S. I. & Itoh, K., Dec 1 2012, In : Plasma and Fusion Research. 7, SPL.ISS.1, 2401133.

Research output: Contribution to journalArticle

Evaluation of electron temperature fluctuations using two different probe techniques in Plasma Assembly for Nonlinear Turbulence Analysis (PANTA)

Kawashima, K., Miyoshi, Y., Oldenbürger, S., Inagaki, S., Arakawa, H., Nagashima, Y., Yamada, T., Sasaki, M., Kobayashi, T., Uriu, K., Sugita, S., Yagi, M., Kasuya, N., Fujisawa, A., Itoh, S. I. & Itoh, K., Jan 1 2011, In : Plasma and Fusion Research. 6, 2406118.

Research output: Contribution to journalArticle

9 Citations (Scopus)

Evaluation of electron temperature fluctuations using two different probe techniques in Plasma Assembly For Nonlinear Turbulence Analysis (PANTA)

Kawashima, K., Miyoshi, Y., Oldenbürger, S., Shigeru, I., Arakawa, H., Nagashima, Y., Yamada, T., Sasaki, M., Kobayashi, T., Uriu, K., Sugita, S., Yagi, M., Kasuya, N., fujisawa, A., Itoh, S. I. & Itoh, K., Dec 1 2011, In : Plasma and Fusion Research. 6, 1 SPECIAL ISSUE, 2402118.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Evaluation of excitation conditions of ITG modes in the PANTA

Miwa, Y., Kasuya, N., Sasaki, M., Inagaki, S., Itoh, K., Yagi, M., Fujisawa, A., Nagashima, Y., Lesur, M., Kobayashi, T., Yamada, S., Yamashita, T., Otsubo, S., Kakigawa, S., Mitsuzono, T., Fujino, H. & Itoh, S. I., Jan 1 2013, In : Plasma and Fusion Research. 8, 2403133.

Research output: Contribution to journalArticle

5 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

Evaluation of non-linear mode coupling during end-plate biasing experiment in PANTA

Kin, F., Yamada, T., Inagaki, S., Arakawa, H., Nagashima, Y., Kasuya, N., Fujisawa, A., Nakanishi, K., Kono, H., Mizokami, T., Sasaki, M., Lesur, M., Kosuga, Y., Itoh, K. & Itoh, S. I., Jan 1 2015, In : Plasma and Fusion Research. 10, 3401043.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Experimental Identification of Electric Field Excitation Mechanisms in a Structural Transition of Tokamak Plasmas

Kobayashi, T., Itoh, K., Ido, T., Kamiya, K., Itoh, S. I., Miura, Y., Nagashima, Y., Fujisawa, A., Inagaki, S., Ida, K. & Hoshino, K., Aug 4 2016, In : Scientific reports. 6, 30720.

Research output: Contribution to journalArticle

12 Citations (Scopus)
12 Citations (Scopus)

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)

Fast algorithm for tomographic reconstruction for plasma emission

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

Research output: Contribution to journalArticle

2 Citations (Scopus)

Fast visible imaging and edge turbulence analysis in QUEST

Banerjee, S., Zushi, H., Nishino, N., Nagashima, Y., Hanada, K., Ishiguro, M., Ryoukai, T., Tashima, S., Inoue, T., Nakamura, K., Idei, H., Hasegawa, M., Fujisawa, A. & Matsuoka, K., Oct 1 2012, In : Review of Scientific Instruments. 83, 10, 10E524.

Research output: Contribution to journalArticle

7 Citations (Scopus)