TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 61 (No. 6), pp. 765-778, 2009

A new instrument for the study of wave-particle interactions in space: One-chip Wave-Particle Interaction Analyzer

Hajime Fukuhara1, Hirotsugu Kojima2, Yoshikatsu Ueda2, Yoshiharu Omura2, Yuto Katoh3, and Hiroshi Yamakawa2

1Graduate School of Engineering, Kyoto University, Kyotodaigaku-katsura, Kyoto 615-8510, Japan
2Research Institute for Sustainable Humanosphere, Kyoto university, Gokasho, Uji, Kyoto 611-0011, Japan
3Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan

(Received September 2, 2008; Revised December 7, 2008; Accepted December 7, 2008; Online published July 27, 2009)

Abstract: Wave-particle interactions in a collisionless plasma have been analyzed in several past space science missions but direct and quantitative measurement of the interactions has not been conducted. We here introduce the Wave-Particle Interaction Analyzer (WPIA) to observe wave-particle interactions directly by calculating the inner product between the electric field of plasma waves and of plasma particles. The WPIA has four fundamental functions: waveform calibration, coordinate transformation, time correction, and interaction calculation. We demonstrate the feasibility of One-chip WPIA (O-WPIA) using a Field Programmable Gate Array (FPGA) as a test model for future science missions. The O-WPIA is capable of real-time processing with low power consumption. We validate the performance of the O-WPIA including determination of errors in the calibration and power consumption.
Key words: Wave-particle interaction, plasma waves, collisionless plasma, FPGA.

Corresponding author E-mail: fukuhara@rish.kyoto-u.ac.jp

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