Adaptive array technique for differential-phase reflectometry in QUEST

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4891710· OSTI ID:22308928

Hanada, K.; Zushi, H. ^[1]; Nagata, K.; Mishra, K.; Itado, T.; Akimoto, R. ^[2]; Yamamoto, M. K. ^[3]

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1. Research Institute for Applied Mechanics, Kyushu Univ., Kasuga, 816-8560 Japan (Japan)
2. Interdisciplinary Grad. School of Eng. Sci., Kyushu Univ., Kasuga, 816-8580 Japan (Japan)
3. Research Institute for Sustainable Humanosphere, Kyoto Univ., Uji, 611-0011 Japan (Japan)

A Phased Array Antenna (PAA) was considered as launching and receiving antennae in reflectometry to attain good directivity in its applied microwave range. A well-focused beam was obtained in a launching antenna application, and differential-phase evolution was properly measured by using a metal reflector plate in the proof-of-principle experiment at low power test facilities. Differential-phase evolution was also evaluated by using the PAA in the Q-shu University Experiment with Steady State Spherical Tokamak (QUEST). A beam-forming technique was applied in receiving phased-array antenna measurements. In the QUEST device that should be considered as a large oversized cavity, standing wave effect was significantly observed with perturbed phase evolution. A new approach using derivative of measured field on propagating wavenumber was proposed to eliminate the standing wave effect.

• OSTI ID: 22308928
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANTENNAS
BEAM PROFILES
EVALUATION
MEASURING INSTRUMENTS
MICROWAVE RADIATION
REFLECTION
STANDING WAVES
TEST FACILITIES
TESTING
TOKAMAK DEVICES