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DIELECTRIC RF RESONATORS WITH OPEN BOUNDARIES FOR STUDYING RADIATION EFFECT ON ELECTRODYNAMIC CHARACTERISTICS OF SOLID DIELECTRICS

The use of dielectric materials in the charged particles accelerators requires investigation of changes in the electrodynamic properties of these materials under the influence of ionizing radiation. First of all it is necessary to study the effect of radiation on the complex dielectric permittivity (ꜫ and tgδ) of these materials. The actual task is to measure very small relative changes in the dielectric constant, for example, ∆ꜫ/ꜫ~10-4. Such accuracy can be provided by resonator methods. In the present work results of theoretical and experimental research of microwave dielectric resonators with open boundaries are given. It is shown, that they can be used to measure dielectrics during irradiation by gamma radiation or charged particles beam. The analysis of factors that affect the accuracy of measurements is carried out.