Measurement of electrostatic potential fluctuation using heavy ion beam probe in large helical device

Takeshi Ido; Akihiro Shimizu; Masaki Nishiura; Haruhisa Nakano; Shinsuke Ohshima; Shinji Kato; Yasuji Hamada; Yasuo Yoshimura; Shin Kubo; Takashi Shimozuma; Hiroe Igami; Hiromi Takahashi; Kazuo Toi; Fumitake Watanabe

doi:10.1063/1.2971207

Measurement of electrostatic potential fluctuation using heavy ion beam probe in large helical device

Takeshi Ido, Akihiro Shimizu, Masaki Nishiura, Haruhisa Nakano, Shinsuke Ohshima, Shinji Kato, Yasuji Hamada, Yasuo Yoshimura, Shin Kubo, Takashi Shimozuma, Hiroe Igami, Hiromi Takahashi, Kazuo Toi, Fumitake Watanabe

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

9 Citations (Scopus)

Abstract

Heavy ion beam probe (HIBP) for large helical device (LHD) has been improved to measure the potential fluctuation in high-temperature plasmas. The spatial resolution is improved to about 10 mm by controlling the focus of a probe beam. The HIBP is applied to measure the potential fluctuation in plasmas where the rotational transform is controlled by electron cyclotron current drive. The fluctuations whose frequencies change with the time constant of a few hundreds of milliseconds and that with a constant frequency are observed. The characteristics of the latter fluctuation are similar to those of the geodesic acoustic mode oscillation. The spatial profiles of the fluctuations are also obtained.

Original language	English
Article number	10F318
Journal	Review of Scientific Instruments
Volume	79
Issue number	10
DOIs	https://doi.org/10.1063/1.2971207
Publication status	Published - 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.2971207

Cite this

@article{45df3f6fa0664d12b2b61daf000b4fe3,

title = "Measurement of electrostatic potential fluctuation using heavy ion beam probe in large helical device",

abstract = "Heavy ion beam probe (HIBP) for large helical device (LHD) has been improved to measure the potential fluctuation in high-temperature plasmas. The spatial resolution is improved to about 10 mm by controlling the focus of a probe beam. The HIBP is applied to measure the potential fluctuation in plasmas where the rotational transform is controlled by electron cyclotron current drive. The fluctuations whose frequencies change with the time constant of a few hundreds of milliseconds and that with a constant frequency are observed. The characteristics of the latter fluctuation are similar to those of the geodesic acoustic mode oscillation. The spatial profiles of the fluctuations are also obtained.",

author = "Takeshi Ido and Akihiro Shimizu and Masaki Nishiura and Haruhisa Nakano and Shinsuke Ohshima and Shinji Kato and Yasuji Hamada and Yasuo Yoshimura and Shin Kubo and Takashi Shimozuma and Hiroe Igami and Hiromi Takahashi and Kazuo Toi and Fumitake Watanabe",

note = "Funding Information: We are grateful to Dr. A. Fujisawa, Dr. A. V. Melnikov, and members of the LHD experimental group for fruitful discussion. We thank Professor O. Motojima and Professor S. Sudo for their continuous encouragement. This work was supported by MEXT Japan under Grant-in-Aid for Young Scientists (Nos. 16760674 and 18760640), by the NIFS/NINS under the project of Formation of International Network for Scientific Collaborations, and by NIFS under NIFS07ULBB505, 514, and 515.",

year = "2008",

doi = "10.1063/1.2971207",

language = "English",

volume = "79",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics Publising LLC",

number = "10",

}

TY - JOUR

T1 - Measurement of electrostatic potential fluctuation using heavy ion beam probe in large helical device

AU - Ido, Takeshi

AU - Shimizu, Akihiro

AU - Nishiura, Masaki

AU - Nakano, Haruhisa

AU - Ohshima, Shinsuke

AU - Kato, Shinji

AU - Hamada, Yasuji

AU - Yoshimura, Yasuo

AU - Kubo, Shin

AU - Shimozuma, Takashi

AU - Igami, Hiroe

AU - Takahashi, Hiromi

AU - Toi, Kazuo

AU - Watanabe, Fumitake

N1 - Funding Information: We are grateful to Dr. A. Fujisawa, Dr. A. V. Melnikov, and members of the LHD experimental group for fruitful discussion. We thank Professor O. Motojima and Professor S. Sudo for their continuous encouragement. This work was supported by MEXT Japan under Grant-in-Aid for Young Scientists (Nos. 16760674 and 18760640), by the NIFS/NINS under the project of Formation of International Network for Scientific Collaborations, and by NIFS under NIFS07ULBB505, 514, and 515.

PY - 2008

Y1 - 2008

N2 - Heavy ion beam probe (HIBP) for large helical device (LHD) has been improved to measure the potential fluctuation in high-temperature plasmas. The spatial resolution is improved to about 10 mm by controlling the focus of a probe beam. The HIBP is applied to measure the potential fluctuation in plasmas where the rotational transform is controlled by electron cyclotron current drive. The fluctuations whose frequencies change with the time constant of a few hundreds of milliseconds and that with a constant frequency are observed. The characteristics of the latter fluctuation are similar to those of the geodesic acoustic mode oscillation. The spatial profiles of the fluctuations are also obtained.

AB - Heavy ion beam probe (HIBP) for large helical device (LHD) has been improved to measure the potential fluctuation in high-temperature plasmas. The spatial resolution is improved to about 10 mm by controlling the focus of a probe beam. The HIBP is applied to measure the potential fluctuation in plasmas where the rotational transform is controlled by electron cyclotron current drive. The fluctuations whose frequencies change with the time constant of a few hundreds of milliseconds and that with a constant frequency are observed. The characteristics of the latter fluctuation are similar to those of the geodesic acoustic mode oscillation. The spatial profiles of the fluctuations are also obtained.

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U2 - 10.1063/1.2971207

DO - 10.1063/1.2971207

M3 - Article

C2 - 19044631

AN - SCOPUS:55349105872

SN - 0034-6748

VL - 79

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

M1 - 10F318

ER -

Measurement of electrostatic potential fluctuation using heavy ion beam probe in large helical device

Abstract

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