Speaker
Description
This research focuses on making compact cyclotrons genuinely reconfigurable without hardware changes (matchbox) with digitally timed, wide-range RF/voltage source.
We propose a concept that introduces a digitally agile acceleration-voltage source that replaces an analogue sinusoidal RF drive with a programmable, soft-edged square-pulse waveform. The Digital Soft Square Wave Generator (DISWAG) approach utilizes an FPGA-driven logic unit and a high-frequency Class-D power stage to generate precisely timed voltage pulses, leveraging Zero-Voltage Switching (ZVS) to minimize switching losses alongside a custom-made transformer. This concept allows for the generation of a nearby rectangular signal which further optimizes the performance.
Key design targets include operation in the low MHz range (around 2-4 MHz acceleration frequency) and kilovolt-level output to match the needs of multi-keV compact cyclotrons. Initial simulations and GaN transistor tests have affirmed the feasibility of this approach, demonstrating stable MHz switching with lower thermal losses. The digital waveform can be retuned during functionality to accommodate different isotopes and beam conditions.
Funding Agency
Bayerisches Staatsministerium für Wissenschaft und Kunst
