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Journal Articles

Full-image operation of fast charge exchange recombination spectroscopy with high-spatial and high-wavelength resolutions in large helical device

T. Kobayashi, M. Yoshinuma, K. Ida
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 96, 033502 (2025)
https://doi.org/10.1063/5.0251924
Published: March 2025
View articletitled, Full-image operation of fast charge exchange recombination spectroscopy with high-spatial and high-wavelength resolutions in large helical device
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Journal Articles

Visible core spectroscopy at Wendelstein 7-X

O. P. Ford, A. Langenberg, T. Romba, P. Pölöskei, M. Zanini, S. Bannmann, T. Gonda, K. Ida, R. Lopez Cansino, N. Pablant, J. de la Riva Villen, C. Swee, M. Yoshinuma, A. Alonso, B. Geiger, V. Perseo, E. Viezzer, W7-X Team
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 95, 083526 (2024)
https://doi.org/10.1063/5.0219469
Published: August 2024
View articletitled, Visible core spectroscopy at Wendelstein 7-X
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Journal Articles

MHD stability trends and improved performance of LHD inward-shifted configurations: The role of the neutral beam current drive and thermal plasma density

J. Varela, K. Nagaoka, Y. Takemura, K. Y. Watanabe, K. Ida, M. Yoshinuma, K. Nagasaki, A. Cappa, S. Sharapov, D. A. Spong, L. Garcia, Y. Ghai, J. Ortiz
Journal: Physics of Plasmas
Phys. Plasmas 31, 082504 (2024)
https://doi.org/10.1063/5.0206400
Published: August 2024
View articletitled, MHD stability trends and improved performance of LHD inward-shifted configurations: The role of the neutral beam current drive and thermal plasma density
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Journal Articles

Core density profile control by energetic ion anisotropy in LHD

Editor’s Pick
M. Nishiura, A. Shimizu, T. Ido, S. Satake, M. Yoshinuma, R. Yanai, M. Nunami, H. Yamaguchi, H. Nuga, R. Seki, K. Fujita, M. Salewski
Journal: Physics of Plasmas
Phys. Plasmas 31, 062505 (2024)
https://doi.org/10.1063/5.0201440
Published: June 2024
View articletitled, Core density profile control by energetic ion anisotropy in LHD
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Journal Articles

Phase-space tomography in magnetically confined plasmas

T. Kobayashi, M. Yoshinuma, W. Hu, K. Ida
Journal: Physics of Plasmas
Phys. Plasmas 30, 052303 (2023)
https://doi.org/10.1063/5.0146602
Published: May 2023
View articletitled, Phase-space tomography in magnetically confined plasmas
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Journal Articles

Receiver circuit improvement of dual frequency-comb ka-band Doppler backscattering system in the large helical device (LHD)

T. Nasu, T. Tokuzawa, T. I. Tsujimura, K. Ida, M. Yoshinuma, T. Kobayashi, K. Tanaka, M. Emoto, S. Inagaki, A. Ejiri, J. Kohagura
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 93, 113518 (2022)
https://doi.org/10.1063/5.0101588
Published: November 2022
View articletitled, Receiver circuit improvement of dual frequency-comb ka-band Doppler backscattering system in the large helical device (LHD)
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Journal Articles

Charge exchange spectroscopy using spatial heterodyne spectrometer in the large helical device

F. J. Arellano, M. Yoshinuma, K. Ida
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 93, 033503 (2022)
https://doi.org/10.1063/5.0078417
Published: March 2022
View articletitled, Charge exchange spectroscopy using spatial heterodyne spectrometer in the large helical device
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Journal Articles

Direct observation of the non-locality of non-diffusive counter-gradient electron thermal transport during the formation of hollow electron-temperature profiles in the Large Helical Device

T. I. Tsujimura, T. Kobayashi, K. Tanaka, K. Ida, K. Nagaoka, M. Yoshinuma, I. Yamada, H. Funaba, R. Seki, S. Satake, T. Kinoshita, T. Tokuzawa, N. Kenmochi, H. Igami, K. Mukai, M. Goto, Y. Kawamoto
Journal: Physics of Plasmas
Phys. Plasmas 29, 032504 (2022)
https://doi.org/10.1063/5.0074351
Published: March 2022
View articletitled, Direct observation of the non-locality of non-diffusive counter-gradient electron thermal transport during the formation of hollow electron-temperature profiles in the Large Helical Device
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Journal Articles

Effects of electron cyclotron heating on the toroidal flow in LHD plasmas

Y. Yamamoto, S. Murakami, C. C. Chang, H. Takahashi, K. Ida, M. Yoshinuma, W. H. Ko
Journal: Physics of Plasmas
Phys. Plasmas 28, 102501 (2021)
https://doi.org/10.1063/5.0057344
Published: October 2021
View articletitled, Effects of electron cyclotron heating on the toroidal flow in LHD plasmas
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Journal Articles

A new multi-tracer pellet injection for a simultaneous study of low- and mid/high-Z impurities in high-temperature plasmas

N. Tamura, M. Yoshinuma, X. Yin, K. Ida, C. Suzuki, M. Shoji, K. Mukai, H. Funaba
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 92, 063516 (2021)
https://doi.org/10.1063/5.0043495
Published: June 2021
View articletitled, A new multi-tracer pellet injection for a simultaneous study of low- and mid/high-Z impurities in high-temperature plasmas
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Journal Articles

Measurements of radial profile of isotope density ratio using bulk charge exchange spectroscopy

M. Yoshinuma, K. Ida, K. Yamasaki, J. Chen, I. Murakami
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 92, 063509 (2021)
https://doi.org/10.1063/5.0043607
Published: June 2021
View articletitled, Measurements of radial profile of isotope density ratio using bulk charge exchange spectroscopy
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Journal Articles

Analysis of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profile in the Large Helical Device

M. Sanders, K. Ida, M. Yoshinuma, C. Suzuki, Y. Yoshimura, R. Seki, M. Emoto, M. Yoshida, T. Kobayashi
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 92, 053503 (2021)
https://doi.org/10.1063/5.0018859
Published: May 2021
View articletitled, Analysis of the Motional Stark Effect (MSE) diagnostic to measure the rotational transform and current profile in the Large Helical Device
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Journal Articles

W-band millimeter-wave back-scattering system for high wavenumber turbulence measurements in LHD

T. Tokuzawa, K. Tanaka, T. Tsujimura, S. Kubo, M. Emoto, S. Inagaki, K. Ida, M. Yoshinuma, K. Y. Watanabe, H. Tsuchiya, A. Ejiri, T. Saito, K. Yamamoto, LHD Experiment Group
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 92, 043536 (2021)
https://doi.org/10.1063/5.0043474
Published: April 2021
View articletitled, W-band millimeter-wave back-scattering system for high wavenumber turbulence measurements in LHD
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Journal Articles

Effect of the Pfirsch–Schlüter flow on the inboard/outboard asymmetry of the toroidal flow in LHD

Y. Yamamoto, S. Murakami, H. Takahashi, K. Ida, M. Yoshinuma, J. Chen
Journal: Physics of Plasmas
Phys. Plasmas 27, 042514 (2020)
https://doi.org/10.1063/1.5126526
Published: April 2020
View articletitled, Effect of the Pfirsch–Schlüter flow on the inboard/outboard asymmetry of the toroidal flow in LHD
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Journal Articles

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

C. Moon, T. Kobayashi, K. Ida, T. Tokuzawa, C. Hidalgo, M. Yoshinuma, K. Ogawa, K. Itoh, A. Fujisawa, LHD Experiment Group
Journal: Physics of Plasmas
Phys. Plasmas 26, 092302 (2019)
https://doi.org/10.1063/1.5098954
Published: September 2019
View articletitled, Spatial structure of low-frequency fluctuations throughout the transition of poloidal flow velocity in edge plasmas of LHD
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Journal Articles

Measurements of radial profile of hydrogen and deuterium density in isotope mixture plasmas using bulk charge exchange spectroscopy

K. Ida, M. Yoshinuma, K. Yamasaki, T. Kobayashi, Y. Fujiwara, J. Chen, I. Murakami, S. Satake, Y. Yamamoto, S. Murakami, M. Kobayashi
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 90, 093503 (2019)
https://doi.org/10.1063/1.5097030
Published: September 2019
View articletitled, Measurements of radial profile of hydrogen and deuterium density in isotope mixture plasmas using bulk charge exchange spectroscopy
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Journal Articles

Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase

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R. C. Wolf, A. Alonso, S. Äkäslompolo, J. Baldzuhn, M. Beurskens, C. D. Beidler, C. Biedermann, H.-S. Bosch, S. Bozhenkov, R. Brakel, H. Braune, S. Brezinsek, K.-J. Brunner, H. Damm, A. Dinklage, P. Drewelow, F. Effenberg, Y. Feng, O. Ford, G. Fuchert, Y. Gao, J. Geiger, O. Grulke, N. Harder, D. Hartmann, P. Helander, B. Heinemann, M. Hirsch, U. Höfel, C. Hopf, K. Ida, M. Isobe, M. W. Jakubowski, Y. O. Kazakov, C. Killer, T. Klinger, J. Knauer, R. König, M. Krychowiak, A. Langenberg, H. P. Laqua, S. Lazerson, P. McNeely, S. Marsen, N. Marushchenko, R. Nocentini, K. Ogawa, G. Orozco, M. Osakabe, M. Otte, N. Pablant, E. Pasch, A. Pavone, M. Porkolab, A. Puig Sitjes, K. Rahbarnia, R. Riedl, N. Rust, E. Scott, J. Schilling, R. Schroeder, T. Stange, A. von Stechow, E. Strumberger, T. Sunn Pedersen, J. Svensson, H. Thomson, Y. Turkin, L. Vano, T. Wauters, G. Wurden, M. Yoshinuma, M. Zanini, D. Zhang, the Wendelstein 7-X Team
Journal: Physics of Plasmas
Phys. Plasmas 26, 082504 (2019)
https://doi.org/10.1063/1.5098761
Published: August 2019
View articletitled, Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase
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Journal Articles

Observation of distorted Maxwell-Boltzmann distribution of epithermal ions in LHD

K. Ida, T. Kobayashi, M. Yoshinuma, T. Akiyama, T. Tokuzawa, H. Tsuchiya, K. Itoh, LHD Experiment Group
Journal: Physics of Plasmas
Phys. Plasmas 24, 122502 (2017)
https://doi.org/10.1063/1.4999644
Published: December 2017
View articletitled, Observation of distorted Maxwell-Boltzmann distribution of epithermal ions in LHD
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Journal Articles

A motional Stark effect diagnostic analysis routine for improved resolution of iota in the core of the large helical device

T. J. Dobbins, K. Ida, C. Suzuki, M. Yoshinuma, T. Kobayashi, Y. Suzuki, M. Yoshida
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 88, 093518 (2017)
https://doi.org/10.1063/1.4995808
Published: September 2017
View articletitled, A motional Stark effect diagnostic analysis routine for improved resolution of iota in the core of the large helical device
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Journal Articles

Novel analysis technique for measuring edge density fluctuation profiles with reflectometry in the Large Helical Device

A. J. Creely, K. Ida, M. Yoshinuma, T. Tokuzawa, T. Tsujimura, T. Akiyama, R. Sakamoto, M. Emoto, K. Tanaka, C. A. Michael
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 88, 073509 (2017)
https://doi.org/10.1063/1.4993437
Published: July 2017
View articletitled, Novel analysis technique for measuring edge density fluctuation profiles with reflectometry in the Large Helical Device
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