Beams Document 4324-v1

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A High-Power Magnetron Transmitter for Superconducting Intensity Frontier Linacs

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Fernanda G Garcia
Updated by:
Fernanda G Garcia
Document Created:
26 Mar 2013, 14:24
Contents Revised:
26 Mar 2013, 14:24
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26 Mar 2013, 14:24
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A high-power magnetron transmitter based on two 2-cascade injection-locked Continuous Wave (CW) magnetrons with outputs combined by a 3-dB hybrid has been proposed. In such a scheme, power control is achieved by varying the phase difference between the two magnetrons, while phase control is provided by the simultaneous variation of phase in both the magnetrons. This allows a fast and precise control of phase and output power, required for individual powering of the intensity-frontier Superconducting RF (SRF) cavities of GeV-scale proton/ion linacs like the Project X CW and pulsed linacs or linacs for ADS projects. The transmitter utilizes vector addition of the signals of the two injection-locked CW magnetrons; operation of the injection-locked CW magnetrons in a 2-cascade scheme allows a large decrease of the locking power necessary for operation within the wide-band control loop. The transmitter is intended to operate within a fast and precise control loop in phase and amplitude. The concept of the transmitter has been verified in experiments with commercial, low-power, 2.45 GHz, CW magnetrons operating in pulsed mode with large pulse duration. The capabilities of the CW injection-locked magnetrons operating within the fast control loop have been verified by measurements of the transfer functions of the magnetrons at the phase control and simulation of the closed loop performance. The measurements and simulation demonstrated capability of the proposed magnetron transmitter to suppress parasitic modulation of the accelerating field in the SRF cavities caused by mechanical noises, low-frequency ripples of the magnetron power supplies and phase noise of the injection-locked magnetrons.
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