Abstract
The system used for sensing and controlling the timing of the bunched ion beam in the ATLAS accelerator has been modified to improve its beam detection capability through the addition of a secondary phase modulation to the reference signal. Exciting a resonant structure with this reference and the bunched ion beam generates a vector sum of the two signals containing phase and beam signal strength information as amplitude modulation components. A linear relationship between one of the modulation components and the average beam current is used in generating a beam monitor signal. The resulting system exhibits sensitivity to beams of 0.3 nA (electrical), dynamic range of 104, beam phase jitter of less than 20 ps at the subharmonic buncher, and is insensitive to environmental changes.
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