Direct measurement of density oscillation induced by a radio-frequency wave

T. Yamada, A. Ejiri, Y. Shimada, T. Oosako, J. Tsujimura, Y. Takase, H. Kasahara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

An O-mode reflectometer at a frequency of 25.85 GHz was applied to plasmas heated by the high harmonic fast wave (21 MHz) in the TST-2 spherical tokamak. An oscillation in the phase of the reflected microwave in the rf range was observed directly for the first time. In TST-2, the rf (250 kW) induced density oscillation depends mainly on the poloidal rf electric field, which is estimated to be about 0.2 kVm rms by the reflectometer measurement. Sideband peaks separated in frequency by ion cyclotron harmonics from 21 MHz, and peaks at ion cyclotron harmonics which are suggested to be quasimodes generated by parametric decay, were detected.

Original languageEnglish
Article number083502
JournalReview of Scientific Instruments
Volume78
Issue number8
DOIs
Publication statusPublished - Sep 7 2007

Fingerprint

Reflectometers
Cyclotrons
radio frequencies
reflectometers
harmonics
oscillations
cyclotrons
Ions
Microwaves
Electric fields
sidebands
Plasmas
ions
microwaves
electric fields
decay

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Yamada, T., Ejiri, A., Shimada, Y., Oosako, T., Tsujimura, J., Takase, Y., & Kasahara, H. (2007). Direct measurement of density oscillation induced by a radio-frequency wave. Review of Scientific Instruments, 78(8), [083502]. https://doi.org/10.1063/1.2769351

Direct measurement of density oscillation induced by a radio-frequency wave. / Yamada, T.; Ejiri, A.; Shimada, Y.; Oosako, T.; Tsujimura, J.; Takase, Y.; Kasahara, H.

In: Review of Scientific Instruments, Vol. 78, No. 8, 083502, 07.09.2007.

Research output: Contribution to journalArticle

Yamada, T, Ejiri, A, Shimada, Y, Oosako, T, Tsujimura, J, Takase, Y & Kasahara, H 2007, 'Direct measurement of density oscillation induced by a radio-frequency wave', Review of Scientific Instruments, vol. 78, no. 8, 083502. https://doi.org/10.1063/1.2769351
Yamada, T. ; Ejiri, A. ; Shimada, Y. ; Oosako, T. ; Tsujimura, J. ; Takase, Y. ; Kasahara, H. / Direct measurement of density oscillation induced by a radio-frequency wave. In: Review of Scientific Instruments. 2007 ; Vol. 78, No. 8.
@article{2d166111d6a346228ca0957f98acf1c4,
title = "Direct measurement of density oscillation induced by a radio-frequency wave",
abstract = "An O-mode reflectometer at a frequency of 25.85 GHz was applied to plasmas heated by the high harmonic fast wave (21 MHz) in the TST-2 spherical tokamak. An oscillation in the phase of the reflected microwave in the rf range was observed directly for the first time. In TST-2, the rf (250 kW) induced density oscillation depends mainly on the poloidal rf electric field, which is estimated to be about 0.2 kVm rms by the reflectometer measurement. Sideband peaks separated in frequency by ion cyclotron harmonics from 21 MHz, and peaks at ion cyclotron harmonics which are suggested to be quasimodes generated by parametric decay, were detected.",
author = "T. Yamada and A. Ejiri and Y. Shimada and T. Oosako and J. Tsujimura and Y. Takase and H. Kasahara",
year = "2007",
month = "9",
day = "7",
doi = "10.1063/1.2769351",
language = "English",
volume = "78",
journal = "Review of Scientific Instruments",
issn = "0034-6748",
publisher = "American Institute of Physics Publising LLC",
number = "8",

}

TY - JOUR

T1 - Direct measurement of density oscillation induced by a radio-frequency wave

AU - Yamada, T.

AU - Ejiri, A.

AU - Shimada, Y.

AU - Oosako, T.

AU - Tsujimura, J.

AU - Takase, Y.

AU - Kasahara, H.

PY - 2007/9/7

Y1 - 2007/9/7

N2 - An O-mode reflectometer at a frequency of 25.85 GHz was applied to plasmas heated by the high harmonic fast wave (21 MHz) in the TST-2 spherical tokamak. An oscillation in the phase of the reflected microwave in the rf range was observed directly for the first time. In TST-2, the rf (250 kW) induced density oscillation depends mainly on the poloidal rf electric field, which is estimated to be about 0.2 kVm rms by the reflectometer measurement. Sideband peaks separated in frequency by ion cyclotron harmonics from 21 MHz, and peaks at ion cyclotron harmonics which are suggested to be quasimodes generated by parametric decay, were detected.

AB - An O-mode reflectometer at a frequency of 25.85 GHz was applied to plasmas heated by the high harmonic fast wave (21 MHz) in the TST-2 spherical tokamak. An oscillation in the phase of the reflected microwave in the rf range was observed directly for the first time. In TST-2, the rf (250 kW) induced density oscillation depends mainly on the poloidal rf electric field, which is estimated to be about 0.2 kVm rms by the reflectometer measurement. Sideband peaks separated in frequency by ion cyclotron harmonics from 21 MHz, and peaks at ion cyclotron harmonics which are suggested to be quasimodes generated by parametric decay, were detected.

UR - http://www.scopus.com/inward/record.url?scp=34548391889&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34548391889&partnerID=8YFLogxK

U2 - 10.1063/1.2769351

DO - 10.1063/1.2769351

M3 - Article

C2 - 17764321

AN - SCOPUS:34548391889

VL - 78

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

SN - 0034-6748

IS - 8

M1 - 083502

ER -