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10 results on '"James H.P. Rice"'

1. Langmuir Probe Measurements of Scrape-Off Layer Conditions in RF-Driven Plasmas in TST-2

Author

Hibiki Yamazaki, Naoto Tsujii, James H.P. Rice, Yuki Aoi, Yongtae Ko, Yi Peng, Kyohei Matsuzaki, Yuki Osawa, Osamu Watanabe, Yuichi Takase, Akira Ejiri, and Kotaro Iwasaki

Subjects
symbols.namesake, Materials science, symbols, 20299 Atomic, Molecular, Nuclear, Particle and Plasma Physics not elsewhere classified, Langmuir probe, FOS: Physical sciences, Plasma, Atomic physics, 20199 Astronomical and Space Sciences not elsewhere classified, Condensed Matter Physics, Layer (electronics)
Abstract

No description supplied

Published
2023
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3. Modification of the magneto-hydrodynamic equilibrium by the lower-hybrid wave driven fast electrons on the TST-2 spherical tokamak

Author

Kotaro Iwasaki, Yi Peng, Osamu Watanabe, Akira Ejiri, Yongtae Ko, Hibiki Yamazaki, Charles P. Moeller, Yuichi Takase, Yuki Aoi, Kyohei Matsuzaki, James H.P. Rice, Yuki Osawa, Yasuo Yoshimura, and Naoto Tsujii

Subjects
Physics, Nuclear and High Energy Physics, Toroid, Tokamak, Thomson scattering, Electron, Plasma, Spherical tokamak, Condensed Matter Physics, Lower hybrid oscillation, Computational physics, law.invention, Physics::Plasma Physics, law, Physics::Space Physics, Magnetohydrodynamics
Abstract

Presence of a large population of fast particles may qualitatively modify the tokamak equilibrium from the one that can be described by the standard magneto-hydrodynamics (MHD). The kinetic modification of the MHD equilibrium was studied for a lower-hybrid wave driven plasma on the TST-2 spherical tokamak. The analysis was performed using an equilibrium reconstruction method based on an extended MHD model that considers a two-component plasma of bulk MHD fluid and kinetic fast electrons. Scrape-off-layer current appeared naturally in the extended MHD analysis because of the finite electron orbit excursion from the flux surfaces. This reduced the bulk pressure contribution to the toroidal current substantially. The resulting poloidal flux profile was more consistent with that inferred from the Thomson scattering measurement.

Published
2021
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4. Optimization of Poloidal Field Configuration for Electron Cyclotron Wave Assisted Low Voltage Ohmic Start-Up in TST-2

Author

Yuki Osawa, Yuichi Takase, Yi Peng, Hibiki Yamazaki, Takuma Wakatsuki, Osamu Watanabe, James H.P. Rice, Kotaro Iwasaki, Hajime Urano, Akira Ejiri, Yongtae Ko, Maiko Yoshida, and Naoto Tsujii

Subjects
Physics, law, Cyclotron, Poloidal field, Electron, Atomic physics, Condensed Matter Physics, Start up, Ohmic contact, Low voltage, law.invention
Published
2021
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6. Erratum: 'Langmuir Probe Measurements of Scrape-Off Layer Conditions in RF-Driven Plasmas in TST-2' [Plasma Fusion Res. 15, 2402009 (2020)]

Author

Kyohei Matsuzaki, James H.P. Rice, Yuichi Takase, Yongtae Ko, Yuki Aoi, Akira Ejiri, Yi Peng, Osamu Watanabe, Yuki Osawa, Naoto Tsujii, Kotaro Iwasaki, and Hibiki Yamazaki

Subjects
symbols.namesake, Materials science, symbols, Langmuir probe, Plasma, Atomic physics, Condensed Matter Physics, Plasma fusion, Layer (electronics)
Published
2020
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7. Development of a Compact Hard X-Ray Camera on the TST-2 Spherical Tokamak

Author

Hibiki Yamazaki, Naoto Tsujii, James H.P. Rice, Yi Peng, Osamu Watanabe, Yongtae Ko, Yasuo Yoshimura, Yuichi Takase, Yuki Aoi, Kyohei Matsuzaki, Yuki Osawa, Kotaro Iwasaki, and Akira Ejiri

Subjects
Physics, Optics, hard X-ray measurement, business.industry, X-ray, Development (differential geometry), spherical tokamak, Spherical tokamak, Condensed Matter Physics, business, lower hybrid wave, pinhole camera, LYSO scintillator
Abstract

A compact hard X-ray camera has been developed to study the behavior of fast electrons accelerated by lower hybrid waves in the TST-2 spherical tokamak. The camera consists of a pinhole made of tungsten alloy, a thin resin window, a thin LYSO scintillator disk, 5 fiber optic light guides and 5 photomultiplier tubes and shields. The camera is installed on a tangential port, and two-dimensional images are obtained by rotating the system around the axis of the port on a shot by shot basis. The typical energy range is 10 - 250 keV, and the energy resolution is about 100% (FWHM) at 100 keV. The measured images of a lower hybrid wave driven plasma show bright region at the inboard side (i.e., high field side).

Published
2020
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9. Observation of Parametric Decay Instability on TST-2 Lower Hybrid Wave Driven Plasma

Author

Kyohei Matsuzaki, Naoto Tsujii, James H.P. Rice, Yuki Osawa, Yuki Aoi, Osamu Watanabe, Kotaro Iwasaki, Yi Peng, Yuichi Takase, Akira Ejiri, Hibiki Yamazaki, Charles P. Moeller, Yongtae Ko, and Yasuo Yoshimura

Subjects
Materials science, Isotope, Deuterium, Hydrogen, chemistry, Stable isotope ratio, chemistry.chemical_element, Plasma, Atomic physics, Condensed Matter Physics, Lower hybrid oscillation, Instability, Magnetic field
Published
2020
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10. Measurement of the Lower Hybrid Wave Using RF Magnetic Probes on the TST-2 Spherical Tokamak

Author

Sho Sakamoto, Yongtae Ko, Yuya Kawamata, Yusuke Iida, Yuki Aoi, Yasuo Yoshimura, Osamu Watanabe, Teruki Oishi, Naoto Tsujii, S. Yajima, Charles P. Moeller, Kyohei Matsuzaki, Akira Ejiri, Kotaro Iwasaki, Yusuke Yoshida, Yuichi Takase, James H.P. Rice, and Hibiki Yamazaki

Subjects
Electric cables, Optics, business.industry, Electrical equipment, Numerical analysis, Spherical tokamak, Condensed Matter Physics, Polarization (waves), business, Lower hybrid oscillation, Electrical conductor, Magnetic field
Published
2019
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