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Calibrated microwave power and phase measurements are presented for the first recirculating planar magnetron prototype consisting of two coupled six-cavity 1-GHz planar cavity arrays. The results are presented for a solid cathode and two mode-control cathodes (MCCs) with aluminum or velvet electron emitters. The measurements were conducted using a prototype coaxial microwave power extraction scheme. The experimental operating parameters included: pulsed cathode voltages between −250 and −300 kV, voltage pulselengths of 200-600 µs, axial magnetic fields of 0.1-0.32 T, and entrance currents of 1-10 kA. The results showed improved oscillator frequency locking for the MCCs and increases in power and efficiency using the velvet electron emitter. Index Terms-Cavity magnetron, frequency locking, high-power microwaves (HPMs), recirculating planar magnetron (RPM), vacuum electronics.

An analytic solution of the time‐dependent diffusion equation for point defects in the stress field of a straight edge dislocation is given taking into account the elastic interaction due to the first‐order size‐effect. Modified Bessel functions determine the steady‐state contribution to the defect concentration whereas the time‐dependent part is governed by modified Mathieu functions. The results are applied to the calculation of the dislocation bias for interstitial absorption playing an important role with regard to void swelling and irradiation‐induced creep in metals. This reveals that the definition of a constant bias as conveniently used in steady‐state theories has to be extended to a bias function depending on radius and time.

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