Speaker
Description
In an electron synchrotron, precise charge data in bunch-by-bunch domain allows real-time monitoring of bunch-selective charge operations and fill patterns. For ESRF, a new software release for Libera Digit 500 instrument was developed to provide high quality averaged bunch-by-bunch charge data without the need of very fast ADCs. The working principle is based on locking the ADC sampling rate to the RF frequency, which ensures sampling precisely on pulse peaks. The peak value of each individual bunch is integrated over N turns at the turn-by-turn rate, which decreases the noise by a factor √N (typically 600) - tests with beam show clear resolution of 1E-4 losses on a selected bunch. These capabilities allow very precise measurements of the evolution of bunch charges over time and enable applications such as bunch-selective charge variation monitoring over time (scraping, top-up ...), bunch-by-bunch beam position monitoring (4 input channels) and others. The main inconvenience is the strong dependence on the precise synchronization between the instrument's sampling phase and the beam phase. This paper will present the working principles of processing, characterize firsts results with the beam at ESRF and list limitations.
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