First multi-cavity magnetrons were built in NII-9, Leningrad, during the spring of 1937 PIC simulations of the first 4-cavity S-band CW magnetron

First solid-anode hole-and-slot magnetrons operating in the centimeter band were built in Leningrad, USSR, by N.F. Alekseev and D.E. Malyarov under the supervision of M.A. Bonch-Bruevich who was the scientific director of the NII-9 and who actually developed the original concept of the multi-cavity magnetrons and made first drafts of those devices. The first 4-cavity magnetron operating at ~9 cm was able to produce about 300 W of CW microwave power with efficiency of ~20%. Operational parameters of this magnetron are simulated with modern computer codes using geometrical dimensions published in the first and the only paper “Generation of high-power oscillations with a magnetron in the centimeter band”, which describes the work that was “done during the years 1936 and 1937 for the purpose of producing high-power oscillations in the centimeter-wave band by the use of magnetrons”. The dispersion characteristic showing “cold” resonance frequencies of this magnetron is analyzed using the SUPERFISH code. The operational domain showing both the Hartree and the Hull thresholds voltages of this magnetron is calculated using the “cold” frequencies of the magnetron operation. The PIC simulations of the virtual proto-type of the magnetron are performed using the MAGIC code and optimal anode voltages and magnetic fields determined by the operational domain of the magnetron. Results of the simulations show some inherent features of the first four-cavity solid-anode S-band CW magnetron operation.