Development of electronics and instrumentation for a versatile, scalable and cost-effective control system for a 1.7 MV electrostatic ion accelerator

Abstract

This paper presents the indigenous design and development details of electronics and instrumentation for a versatile, scalable and cost-effective control and monitoring system for a 1.7 MV electrostatic ion accelerator. The personal computer (PC) based control and monitoring system was developed using fiber-optic communication to provide complete electrical isolation, ensuring noise immunity, high-voltage isolation, and reliable high-speed data transfer. The PC based control system enables fast response (1–20 ms), reliable operation, and efficient tuning of stable light- and heavy-ion beams through user-friendly control of numerous accelerator parameters. It features a modular, scalable, and vendor-independent architecture for easy maintenance, upgrades, and integration with beam diagnostics and experimental systems. The control system developed demonstrated high control accuracy (within 0.1 %), low offset errors (2–5 mV), analog update rates of 25–28 Hz, long-term stability, and rapid response for status updates, control signal transfer, and interlock operation (Gate Valve/Faraday cup status update: 0.16 ms, digital control signal transfer: ∼1.5 ms, interlock response: 2.5–3 ms). A high-resolution embedded controller provides 0.002 % control and 0.02 % monitoring resolution for critical accelerator parameters, while an independent PLC-based interlock system ensures continuous safety supervision and automatic fault protection. It also incorporates continuous vacuum health monitoring, expandable subsystem integration, advanced LabVIEW-based software for automation and fault management, and enhanced safety through multi-level authentication, hardware key switches, uninterrupted power supply (UPS)-backed operation, and automatic safe-state transitions during power failures. The developed control system demonstrated high precision, accuracy, and reliability for accelerator operation, ion implantation, and ion beam characterization experiments ranging from milliseconds to several days. Automation of startup, shutdown, and beam tuning procedures reduced experimental setup time from hours to minutes, significantly lowering operator workload while increasing throughput, efficiency, and performance for both single-sample and batch experiments. Implemented using low-cost, off-the-shelf components and LabVIEW-based virtual instrumentation, the control system avoids dependence on proprietary hardware and software while providing flexibility, scalability, ease of debugging and maintenance, standalone operation, and cross-platform portability.