Measurement of ICRF wave propagation using a microwave reflectometer with fast antenna switching on GAMMA 10

Ryuya Ikezoe, M. Ichimura, J. Itagaki, M. Hirata, S. Sumida, S. Jang, K. Izumi, A. Tanaka, R. Sekine, Y. Kubota, Y. Shima, J. Kohagura, M. Yoshikawa, M. Sakamoto, Y. Nakashima

Research output: Contribution to journalArticle

Abstract

Slow Alfvén wave in ion cyclotron range of frequency (ICRF) is a powerful tool to heat ions confined in a mirror field. In spite of its efficient heating effect that has been attained in the central cell of GAMMA 10, there are still unknown characteristics concerning boundary condition, transient variation of heating effect, exact picture of cyclotron damping, and so on. To study these characteristics in detail, a multi-point measurement of the waves inside the hot plasma has been recently developed by using a microwave reflectometer. In addition to a radial profile measurement that is available by a usual reflectometer, an axial measurement has been achieved by arraying transmitting and receiving horn antennas in the axial direction, which are repeatedly switched in time during a discharge with PIN diode switches. Another transmitting and receiving horn antenna pair was newly added to the system and probing at five cross sections was achieved in a single discharge with time resolution of about 1 ms at each antenna pair position. With the upgraded reflectometer system, axial and radial distributions of wave-induced fluctuations and those temporal behavior were clearly observed, offering valuable data on wave physics in a hot mirror plasma.

Original languageEnglish
Article numberC12017
JournalJournal of Instrumentation
Volume12
Issue number12
DOIs
Publication statusPublished - Dec 11 2017
Externally publishedYes

Fingerprint

microwave reflectometers
Reflectometers
Cyclotrons
Wave propagation
Wave Propagation
Microwave
cyclotrons
Antenna
wave propagation
antennas
Microwaves
Antennas
horn antennas
Horn antennas
Receiving antennas
reflectometers
Ions
Range of data
Heating
Mirror

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Mathematical Physics

Cite this

Measurement of ICRF wave propagation using a microwave reflectometer with fast antenna switching on GAMMA 10. / Ikezoe, Ryuya; Ichimura, M.; Itagaki, J.; Hirata, M.; Sumida, S.; Jang, S.; Izumi, K.; Tanaka, A.; Sekine, R.; Kubota, Y.; Shima, Y.; Kohagura, J.; Yoshikawa, M.; Sakamoto, M.; Nakashima, Y.

In: Journal of Instrumentation, Vol. 12, No. 12, C12017, 11.12.2017.

Research output: Contribution to journalArticle

Ikezoe, R, Ichimura, M, Itagaki, J, Hirata, M, Sumida, S, Jang, S, Izumi, K, Tanaka, A, Sekine, R, Kubota, Y, Shima, Y, Kohagura, J, Yoshikawa, M, Sakamoto, M & Nakashima, Y 2017, 'Measurement of ICRF wave propagation using a microwave reflectometer with fast antenna switching on GAMMA 10', Journal of Instrumentation, vol. 12, no. 12, C12017. https://doi.org/10.1088/1748-0221/12/12/C12017
Ikezoe, Ryuya ; Ichimura, M. ; Itagaki, J. ; Hirata, M. ; Sumida, S. ; Jang, S. ; Izumi, K. ; Tanaka, A. ; Sekine, R. ; Kubota, Y. ; Shima, Y. ; Kohagura, J. ; Yoshikawa, M. ; Sakamoto, M. ; Nakashima, Y. / Measurement of ICRF wave propagation using a microwave reflectometer with fast antenna switching on GAMMA 10. In: Journal of Instrumentation. 2017 ; Vol. 12, No. 12.
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