A New Orbit System for the CERN Antiproton Decelerator

This contribution will describe the new orbit system foreseen for the Antiproton Decelerator (AD) located at CERN. The AD decelerates antiprotons from 3.57 GeV/c down to 100 MeV/c, with an intensity ranging from 1×107 to 5×107 particles. The orbit system developed is based on 34 horizontal and 29 vertical electrostatic beam position monitors (BPMs) fitted with existing low noise front-end amplifiers. After amplification, the BPM signals will be digitized and down-mixed to baseband, decimated and filtered before computation to extract the position. The digital acquisition part of the orbit measurement system is based on the VME Switched Serial (VXS) enhancement of the VME64x standard and includes VITA57 standard FPGA Mezzanine Cards (FMC). The system is foreseen to measure complete orbits every 2.5 ms with a resolution of 0.1 mm.