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Schematic of (a) pressurized waveguide/horn and vacuum apparatus and (b) the shape of the dipole initiators of length . Polarization of the microwave field is parallel to the long dimension of the initiator.
Present breakdown-field data (solid triangles) vs pressure for an off-resonant dipole of and data of Ref. 9 (open squares) at and . The upper solid curve is the breakdown curve for the no-initiator case and the lower solid curve is the initiator model of Ref. 7 for .
Measurements (triangles) of electric field required for breakdown at of air for a dipole length . The model of Ref. 7 is shown by the solid curve.
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