Abstract
The applications of magnetrons to high power proton and cw electron linacs are discussed. An experiment is described where a 2.45 GHz magnetron has been used to drive a single cell superconducting cavity. With the magnetron injection locked, a modest phase control accuracy of 0.95\ifmmode^\circ\else\textdegree\fi{} rms has been demonstrated. Factors limiting performance have been identified.
Highlights
This paper describes the potential application of magnetron rf power sources to proton or electron linacs and describes a proof of principle experiment
One notes that the relative heights of the 60 Hz peak and its harmonics are marginally increased with respect to Fig. 5 while the microphonics peak at 30 Hz is marginally reduced by 1 dB
This paper has suggested a method for employing magnetrons as sources of long pulse or continuous wave rf power in order to individually drive accelerator cavities along a beam line where accurate relative phase synchronization and accurate amplitude control is required
Summary
This paper describes the potential application of magnetron rf power sources to proton or electron linacs and describes a proof of principle experiment. For the experimental work presented here, the magnetron is operated as an amplifier in a feedback loop and the cathode heater power is adjusted to allow the magnetron to operate in a relatively low noise state In this mode of operation, the performance of the magnetron was sufficient for the phase of a high Q superconducting cavity to be controlled to better than 1 in the presence of cavity microphonics. Continuous wave (cw) superconducting electron linacs are under development, for example CHESS at CESR [3], or being upgraded, for example CEBAF to 12 GeV [4] Key issues for such constructions, their operation, and lifetime maintenance are cost and efficient rf generation. Before the consideration of rf sources for accelerators, phase locked magnetrons had been investigated for radar applications [18]
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