Experimental study on chorus emission in an artificial magnetosphere

Autor: Haruhiko Saitoh, Masaki Nishiura, Naoki Kenmochi, Zensho Yoshida

Publikováno v: Nature Communications, Vol 15, Iss 1, Pp 1-11 (2024)

Abstract Wave particle interaction plays an important role in geospace and space weather phenomena. Whistler mode chorus emissions, characterized by non-linear growth and frequency chirping, are common in planetary magnetospheres. They are regarded a

Externí odkaz: https://doaj.org/article/8f0dee4684aa4768894a2241b65ef4df

Calibration of coherence imaging spectroscopy using spectral line sources

Autor: Masaki Nishiura, Kaori Nakamura, Kenji Ueda, Naoki Kenmochi, Zensho Yoshida

Publikováno v: Review of Scientific Instruments 92, 073501 (2021); https://doi.org/10.1063/5.0043875

Coherence imaging spectroscopy (CIS) measures the two-dimensional profiles of both ion temperature and ion velocity in plasmas. The interferometric technique is realized by a certain relation between the phase and the wavelength of light emerging fro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6bf1cf2c04ea4fa2bcbfed8ac09ea0a
https://pubmed.ncbi.nlm.nih.gov/34340462

Collective Thomson scattering diagnostic with in situ calibration system for velocity space analysis in large helical device

Autor: Masaki Nishiura, Shun Adachi, Kenji Tanaka, Shin Kubo, Naoki Kenmochi, Takashi Shimozuma, Ryoma Yanai, Teruo Saito, Hideo Nuga, Ryosuke Seki

Publikováno v: Masaki Nishiura, Shun Adachi, Kenji Tanaka, Shin Kubo, Naoki Kenmochi, Takashi Shimozuma, Ryoma Yanai, Teruo Saito, Hideo Nuga, and Ryosuke Seki, "Collective Thomson scattering diagnostic with in situ calibration system for velocity space analysis in large helical device", Review of Scientific Instruments 93, 053501 (2022) https://doi.org/10.1063/5.0079296

A collective Thomson scattering (CTS) diagnostic with a ±3 GHz band around a 77 GHz gyrotron probe beam was developed to measure the velocity distribution of bulk and fast ions in high-temperature plasmas. We propose a new in situ calibration method

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::adfa0a9e35ce565d947529d30e526f4e
https://doi.org/10.1063/5.0079296

Development of a 56 GHz ECH system for deuterium plasma experiments of a low magnetic field in LHD

Autor: T. Ii Tsujimura, Hiroto Takahashi, R. Yanai, Masaki Nishiura, Shin Kubo, Y. Yoshimura, Hiroe Igami, Shintaro Ito, Yoshinori Mizuno, Naoki Kenmochi, Tadashi Takeuchi, Tomohiro Morisaki, Masaki Osakabe, Takashi Shimozuma

Publikováno v: R. Yanai, T. Ii Tsujimura, S. Kubo, Y. Yoshimura, T. Takeuchi, S. Ito, Y. Mizuno, M. Nishiura, H. Igami, N. Kenmochi, H. Takahashi, T. Shimozuma, M. Osakabe, T. Morisaki, Development of a 56 GHz ECH system for deuterium plasma experiments of a low magnetic field in LHD, Fusion Engineering and Design, Volume 173, 2021, 112862, ISSN 0920-3796, https://doi.org/10.1016/j.fusengdes.2021.112862.

We have completed establishing a 56 GHz electron cyclotron heating (ECH) system with a new gyrotron to realize high β plasma experiments with pure deuterium gas in the Large Helical Device (LHD). This new ECH system made it possible to conduct the r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49f29696f417100704a29c8ecb7abcda
http://hdl.handle.net/10655/00013010

Upgrading LHDGauss Code by Including Obliquely Propagating Wave Absorption Effect for ECH

Autor: Yasuo Yoshimura, Shin Kubo, Hiroe Igami, R. Yanai, Toru Ii Tsujimura, Masaki Nishiura, Hiromi Takahashi, Takashi Shimozuma, Ryota Yoneda

Publikováno v: Plasma and Fusion Research. 16(Special Issue 1):2402084

LHDGauss is a multi-ray tracing code to calculate microwave beam propagation and power deposition of electron cyclotron heating (ECH) using the electron density and electron temperature profiles in the Large Helical Device (LHD) plasma. LHDGauss also

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39ad54c0b53936b8c3f133c85d74ea72
http://hdl.handle.net/10655/00013040