Single-side-band heterodyne differential-phase reflectometry in QUEST

Author

Idei, H. ; Dono, K. ; Wataya, Y. ; Nagata, K. ; Kawasaki, S. ; Zushi, H. ; Hanada, K. ; Sato, K.N. ; Nakamura, K. ; Sakamoto, M. ; Hasegawa, M. ; Higashizono, Y. ; Takase, Y. ; Maekawa, T. ; Mitarai, O. ; Kishimoto, Y. ; Nakashima, H. ; Higashijima, A.

Author_Institution

Res. Inst. for Appl. Mech., Kyushu Univ., Kasuga, Japan

fYear

2009

fDate

21-25 Sept. 2009

Firstpage

1

Lastpage

2

Abstract

In a spherical tokamak (ST), an operating frequency of the reflectometry is low due to the low magnetic field of the device. In the large ST, the reflected wave signal level is weak in the large propagating length, and a direct coupling between the launching and receiving antennae may become comparable level to the reflected signal due to the diffraction effect in the low operating frequency at the ST. New single-side-band heterodyne differential-phase reflectometry is proposed on a large ST device of the QUEST, to remove the direct coupling effect in an amplitude modulation reflectometry.

Keywords

Tokamak devices; amplitude modulation; electromagnetic wave diffraction; microwave reflectometry; receiving antennas; QUEST; amplitude modulation reflectometry; diffraction effect; direct coupling effect; microwave reflectometry; receiving antenna; single-side-band heterodyne differential-phase reflectometry; spherical tokamak; Density measurement; Electrons; Frequency; Phase measurement; Plasma density; Plasma devices; Plasma measurements; Plasma waves; Reflectometry; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on

Conference_Location

Busan

Print_ISBN

978-1-4244-5416-7

Electronic_ISBN

978-1-4244-5417-4

Type

conf

DOI

10.1109/ICIMW.2009.5324785

Filename

5324785