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Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Radio frequency resonator structure and diagnostic measurements for a laboratory simulation of Auroral Kilometric Radiation

Ronald, K. and Speirs, David and McConville, S.L. and Phelps, A.D.R. and Robertson, C.W. and Whyte, C.G. and He, W. and Gillespie, K.M. and Bingham, Robert (2008) Radio frequency resonator structure and diagnostic measurements for a laboratory simulation of Auroral Kilometric Radiation. Physics of Plasmas, 15 (5). 056503. ISSN 1070-664X

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Abstract

Auroral Kilometric Radiation is emitted from regions of depleted plasma density in the Earth's polar magnetosphere. The radiation frequency is close to the local electron cyclotron frequency, polarized in the X-mode with an efficiency of ∼ 1%, with power up to 1 GW. Kinetic analysis of the instability in the descending auroral flux indicated that the phenomena scaled with the cyclotron frequency. Therefore, an experimental reproduction of the auroral geometry has been created scaled to laboratory dimensions by raising the radiation frequency to the microwave range. The experiment transports a 75-85 keV electron beam through a region of increasing magnetic flux density, with a mirror ratio of up to 30. The experiments measured the mode, spectrum, power, and conversion efficiency of the emitted radiation as a function of the mirror ratio in two resonance regimes, with frequencies of 4.42 and 11.7 GHz. The microwave diagnostics and measurements will be presented in this paper.