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The use of high‐order TM0m0 modes of a resonant cavity for magnetized plasma density measurements

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4 Author(s)
Paris, P.J. ; Centre de Recherches en Physique des Plasmas, Association Euratom, Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, 21, Av. des Bains, CH‐1007 Lausanne, Switzerland ; Sawley, M.L. ; Tran, M.Q. ; Voser, K.

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A study of the application of high‐order TM0m0 modes of a cylindrical cavity to the measurement of the density of a magnetized plasma column is presented. It is shown theoretically that judiciously chosen high‐order modes have the potential advantages of both a wide operational range of densities, and a wide range for which a simple perturbation theory is valid. Furthermore, an experiment is described which shows that the TM060 mode can be excited with a sufficiently high Q value to allow accurate determination of the resonant frequencies, and hence plasma density. Favorable comparison between densities in the range 1010–1012 cm-3 measured by means of the resonant cavity technique and microwave interferometry is presented.

Published in:

Journal of Applied Physics  (Volume:67 ,  Issue: 1 )