Speaker
Description
Beam diagnostic systems are crucial for the Hefei Ad-vanced Light Facility (HALF), a fourth-generation light source under construction. However, the testing of its key devices—such as Digital Beam Position Monitors (DBPMs), the Fast Orbit Feedback (FOFB) system, and Bunch-by-Bunch (BbB) processors—is limited by the lack of a laboratory signal generator capable of simulat-ing accelerator physics, which hinders comprehensive closed-loop testing prior to installation. To address this, we have developed an FPGA-based hardware simulator featuring two input ports for feedback signals and four output ports with independently adjustable signal ampli-tudes and synchronous triggers. It integrates a simplified physics model to generate realistic, wideband beam sig-nals with a pulse width of approximately 5 ns, enabling low-cost, repeatable testing without an actual beam. The system quantizes real bunch signals, simulates trans-verse/longitudinal oscillations in an FPGA, and outputs specific waveforms upon a set trigger. By modelling beam dynamics, it also produces signals closely resem-bling those expected during actual operation in Hefei Light Source (HLS). This simulator assists in designing and optimizing beam feedback algorithms while reduc-ing development difficulty for DBPM and BbB systems. Crucially, it fulfills application needs by enabling previ-ously impossible lab tests—such as evaluating BbB algo-rithms and measuring FOFB latency/bandwidth—before the beam is ready.
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