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The Behavior of Antennas in Plasma as a Function of the Frequency of Excitation: Summary Report
Author(s) -
Bachynski M. P.
Publication year - 1972
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs007i008p00777
Subject(s) - dipole , physics , quadrupole , excitation , plasma , debye length , debye , dipole antenna , antenna (radio) , atomic physics , computational physics , condensed matter physics , quantum mechanics , telecommunications , computer science
A feature of the session on the behavior of antennas in a plasma as a function of frequency of excitation was the variety of antenna configurations which was being investigated by various research groups. The emphasis by the Groupe de Recherches Ionosphériques du Centre National d'Etudes de Télécommunications (France) was on quadrupole probes. L. R. O. Storey and J.‐M. Chasseriaux reported on theoretical studies of plasma probes based on the mutual electrical coupling between pairs of dipole antennas. Two types of antennas were analysed, Hertzian dipoles which are short compared with the Debye‐length and double‐sphere dipoles which are long compared with the Debye‐length. In both cases the complete probe is formed by two such antennas separated by a distance much larger than a Debye‐length. The mode of operation of these quadrupole probes can be either active (by driving a current in one dipole and measuring the open circuit potential difference induced on the other) or passive (by measuring the cross‐spectrum of the fluctuating potential differences induced on the two dipoles by the plasma microfield). The quadrupole probes can be applied to the measurement of plasma resonant frequencies, collision frequencies, and the velocity of motion with respect to the probes.