Physics of stabilization and dynamic control of CW magnetrons for superconducting accelerators

G. Kazakevich; R. P. Johnson; I. Gonin; V. Yakovlev; Ya. Derbenev

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arXiv · 2610.13769

Physics of stabilization and dynamic control of CW magnetrons for superconducting accelerators

G. Kazakevich·R. P. Johnson·I. Gonin·V. Yakovlev·Ya. Derbenev

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Abstract

Powerful CW magnetrons were suggested for feeding RF cavities of superconducting accelerators because they provide higher efficiency and lower RF power cost than the traditionally used klystrons, IOTs, or solid-state amplifiers. RF amplifiers driven by a master oscillator serve as coherent RF sources. CW magnetrons are regenerative RF self-oscillators with a huge regenerative gain. This causes regenerative instability with notable noise when a magnetron operates as a self-oscillator, i.e., with the anode voltage above the threshold of self-excitation. An injection locking by a small signal was proposed for phase stabilization of magnetrons. In this case, CW magnetrons with injection-locked (coherent) oscillations generate a notable level of noise. This may preclude the use of CW magnetrons in this mode in superconducting RF (SRF) accelerators. This work discusses our analytical results, PIC simulations, and previously obtained analytical and experimental data regarding the operation and control of CW magnetrons. These results led to the development of methods which are most suitable for SRF accelerators.

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G. Kazakevich, R. P. Johnson, I. Gonin, V. Yakovlev, Ya. Derbenev. 2026-10-09. Physics of stabilization and dynamic control of CW magnetrons for superconducting accelerators. https://arxiv.org/abs/2610.13769

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