Measurement of the lower hybrid wave using RF magnetic probes on the TST-2 spherical tokamak

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

doi:10.1585/PFR.14.3402107

Measurement of the lower hybrid wave using RF magnetic probes on the TST-2 spherical tokamak

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

^*Corresponding author for this work

Biochemistry and Molecular Genetics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Polarization-resolved spatial distribution of waves in the lower hybrid frequency range was measured using radio frequency magnetic probes (RFMPs) in the TST-2 spherical tokamak. Thirteen RFMPs were installed inside of the vacuum vessel, eight on the inboard-side, three on the outboard-side and two on the bottom-side. In TST-2, the lower hybrid wave (LHW) is excited by the outboard-launch antenna and the top-launch antenna. Higher plasma currents can be achieved using the top-launch antenna. Bottom-launch can be simulated by reversing the direction of the toroidal magnetic field. Propagation and absorption of the LHW were investigated numerically for outboard-, top-, and simulated bottom-launch at low and high plasma currents. Results of the wave measurement revealed different propagation characteristics for different launching, which agree partially with the results of numerical calculation.

Original language	English (US)
Article number	3402107
Journal	Plasma and Fusion Research
Volume	14
DOIs	https://doi.org/10.1585/PFR.14.3402107
State	Published - 2019

Funding

This work is supported by Grant-in-Aid for Scientific Research (S) (21226021), by National Institute for Fusion Science Collaboration Research Programs NIFS14KOCR001, NIFS18KOAR022 and NIFS12KUTR078. This work is also supported in part by Japan/US Cooperation in Fusion Research and Development and US DoE Cooperative Agreement DE-FC02-04ER54698. This work is supported by Grant-in-Aid for Scientific Research (S) (21226021), by National Institute for Fusion Science Collaboration Research Programs NIFS14KOCR001, NIFS18KOAR022 and NIFS12KUTR078. This work is also supported in part by Japan/US Cooperation in Fusion Research and Development and US DoE Cooperative Agreement DE-FC02-04ER54698

Keywords

Lower hybrid wave
Magnetic probe
Spherical tokamak

ASJC Scopus subject areas

Condensed Matter Physics

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1585/PFR.14.3402107

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Ko, Y., Tsujii, N., Yajima, S., Takase, Y., Ejiri, A., Watanabe, O., Yamazaki, H., Moeller, C. P., Yoshimura, Y., Yoshida, Y., Iida, Y., Iwasaki, K., Kawamata, Y., Sakamoto, S., Aoi, Y., Oishi, T., Matsuzaki, K., & Rice, J. (2019). Measurement of the lower hybrid wave using RF magnetic probes on the TST-2 spherical tokamak. Plasma and Fusion Research, 14, Article 3402107. https://doi.org/10.1585/PFR.14.3402107

@article{dba2fd660eb049ed8154b89da278e5c3,

title = "Measurement of the lower hybrid wave using RF magnetic probes on the TST-2 spherical tokamak",

abstract = "Polarization-resolved spatial distribution of waves in the lower hybrid frequency range was measured using radio frequency magnetic probes (RFMPs) in the TST-2 spherical tokamak. Thirteen RFMPs were installed inside of the vacuum vessel, eight on the inboard-side, three on the outboard-side and two on the bottom-side. In TST-2, the lower hybrid wave (LHW) is excited by the outboard-launch antenna and the top-launch antenna. Higher plasma currents can be achieved using the top-launch antenna. Bottom-launch can be simulated by reversing the direction of the toroidal magnetic field. Propagation and absorption of the LHW were investigated numerically for outboard-, top-, and simulated bottom-launch at low and high plasma currents. Results of the wave measurement revealed different propagation characteristics for different launching, which agree partially with the results of numerical calculation.",

keywords = "Lower hybrid wave, Magnetic probe, Spherical tokamak",

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

note = "Publisher Copyright: {\textcopyright} 2019 The Japan Society of Plasma.",

year = "2019",

doi = "10.1585/PFR.14.3402107",

language = "English (US)",

volume = "14",

journal = "Plasma and Fusion Research",

issn = "1880-6821",

publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

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Ko, Y, Tsujii, N, Yajima, S, Takase, Y, Ejiri, A, Watanabe, O, Yamazaki, H, Moeller, CP, Yoshimura, Y, Yoshida, Y, Iida, Y, Iwasaki, K, Kawamata, Y, Sakamoto, S, Aoi, Y, Oishi, T, Matsuzaki, K & Rice, J 2019, 'Measurement of the lower hybrid wave using RF magnetic probes on the TST-2 spherical tokamak', Plasma and Fusion Research, vol. 14, 3402107. https://doi.org/10.1585/PFR.14.3402107

TY - JOUR

T1 - Measurement of the lower hybrid wave using RF magnetic probes on the TST-2 spherical tokamak

AU - Ko, Yongtae

AU - Tsujii, Naoto

AU - Yajima, Satoru

AU - Takase, Yuichi

AU - Ejiri, Akira

AU - Watanabe, Osamu

AU - Yamazaki, Hibiki

AU - Moeller, Charles P.

AU - Yoshimura, Yasuo

AU - Yoshida, Yusuke

AU - Iida, Yusuke

AU - Iwasaki, Kotaro

AU - Kawamata, Yuya

AU - Sakamoto, Sho

AU - Aoi, Yuki

AU - Oishi, Teruki

AU - Matsuzaki, Kyohei

AU - Rice, James

PY - 2019

Y1 - 2019

N2 - Polarization-resolved spatial distribution of waves in the lower hybrid frequency range was measured using radio frequency magnetic probes (RFMPs) in the TST-2 spherical tokamak. Thirteen RFMPs were installed inside of the vacuum vessel, eight on the inboard-side, three on the outboard-side and two on the bottom-side. In TST-2, the lower hybrid wave (LHW) is excited by the outboard-launch antenna and the top-launch antenna. Higher plasma currents can be achieved using the top-launch antenna. Bottom-launch can be simulated by reversing the direction of the toroidal magnetic field. Propagation and absorption of the LHW were investigated numerically for outboard-, top-, and simulated bottom-launch at low and high plasma currents. Results of the wave measurement revealed different propagation characteristics for different launching, which agree partially with the results of numerical calculation.

AB - Polarization-resolved spatial distribution of waves in the lower hybrid frequency range was measured using radio frequency magnetic probes (RFMPs) in the TST-2 spherical tokamak. Thirteen RFMPs were installed inside of the vacuum vessel, eight on the inboard-side, three on the outboard-side and two on the bottom-side. In TST-2, the lower hybrid wave (LHW) is excited by the outboard-launch antenna and the top-launch antenna. Higher plasma currents can be achieved using the top-launch antenna. Bottom-launch can be simulated by reversing the direction of the toroidal magnetic field. Propagation and absorption of the LHW were investigated numerically for outboard-, top-, and simulated bottom-launch at low and high plasma currents. Results of the wave measurement revealed different propagation characteristics for different launching, which agree partially with the results of numerical calculation.

KW - Lower hybrid wave

KW - Magnetic probe

KW - Spherical tokamak

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Measurement of the lower hybrid wave using RF magnetic probes on the TST-2 spherical tokamak

Abstract

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

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