Phase and synchronous detector theory as applied to beam position and intensity measurements
A popular signal processing technique for beam position measurements uses the principle of amplitude-modulation-to-phase-modulation (AM/PM) conversion and phase detection. This technique processes position-sensitive beam-image-current probe-signals into output signals that are proportional to the beam's position. These same probe signals may be summed and processed in a different fashion to provide output signals that are proportional to the peak beam current. This paper derives the transfer functions for the AM/PM beam position and peak beam current processors.
Beam position monitoring
Beam monitoring in accelerators is reviewed, with emphasis on the engineering aspects of the problem. Guidelines for monitor design are given. Advantages and disadvantages of various electrode designs and signal processing methods are reviewed. (AIP)
Beam Signal Processing for the Fermilab Longitudinal and Transverse Beam Damping Systems
A beam signal processor is used to secure the position of each charged bunch in the Fermilab main synchrotron. The signal processor operates at 317 MHz, 6 times the fundamental beam component and utilizes an amplitude-to-phase converter/hard limiter combination to obtain a normalized position signal. The normalization process is complete in less than 10 ns and is effective over a 23 dB intensity range. The methods used to sample and process the 2 ns beam signal are discussed and the principle parameters of the device listed. The processor outputs the derived position data to elements in a closed-loop beam damping system.