Bridging the Gap Between Modern UX Design and Particle Accelerator Control Room Interfaces

Accelerator control systems often represent relatively complex and safety-sensitive human-machine interfaces within process control industries. These systems are technically robust and reflect the cumulative integration of solutions built and adapted across decades. One of the regular, unfortunate casualties of provisional accelerator control system updates is their human-system interfaces (HSIs) which often lag behind modern usability and design standards. An additional challenge is that although there is a multitude of established human factors (HF), and user experience (UX) principles for everyday digital applications, there are very few (if any) established principles for complex and safety-critical applications for an accelerator. This paper argues for the importance of established HF and UX principles (herein referred to as human-centered design principles) into the development of accelerator HSIs, emphasizing the need for clarity, consistency, responsiveness, and cognitive accessibility. Drawing from HF/UX best practices and human-centered design, this paper discusses how these approaches can enhance operator performance, reduce human error, and improve accelerator personnel collaboration. Case studies from Accelerator Control Operations Research Network (ACORN) at Fermilab are explored to demonstrate how interfaces built with human-centered design principles can scale with system complexity while remaining intuitive and efficient for diverse user roles including operators, machine experts, and engineers. By bridging the gap between traditional control system design and modern human-centered design methods, this paper provides a roadmap for evolving accelerator HSIs into more usable, maintainable, and effective tools.

💡 Research Summary

The paper addresses a critical gap in the evolution of particle accelerator control systems: the widening discrepancy between technically robust backend control logic and outdated, fragmented Human-System Interfaces (HSIs). While legacy systems like ACNET have maintained functional integrity for decades, their user interfaces have become casualties of incremental updates, leading to high cognitive loads, inconsistent layouts, and increased risks of human error in safety-critical environments.

To bridge this gap, the authors propose integrating established Human Factors (HF) and User Experience (UX) principles directly into the development of accelerator HSIs. The paper identifies four fundamental design pillars:

1. Clarity and Visual Hierarchy: Utilizing color, size, and spatial positioning to prioritize critical beam parameters and alarms, thereby enhancing situational awareness.
2. Consistency: Standardizing layouts, icons, and interaction patterns across the entire system to minimize the cognitive switching costs associated with navigating fragmented interfaces.
3. Responsiveness: Implementing real-time data updates and immediate system feedback (e.g., progress bars, confirmation pop-ups) to ensure operators can trust the instantaneous state of the machine.
4. Cognitive Accessibility: Simplifying complex workflows through visualization and implementing error-prevention mechanisms, such as input validation and autocomplete, to mitigate the risk of human error.

A key highlight of the paper is the implementation strategy demonstrated through the ACORN project at Fermilab. The authors introduce the concept of a “Style Guide” as a “living document” that evolves through continuous field feedback, encompassing typography, color palettes, and interaction patterns. This is supported by a “Design Library” containing reusable UI components (e.g., buttons, charts, alarm panels), which allows for the rapid and consistent deployment of new subsystems, ensuring scalability and reducing the long-term costs of system maintenance.

Furthermore, the paper emphasizes the importance of “early user involvement,” aligned with ISO 9241-112:2025 standards. By utilizing interviews, observations, and task analysis, the design process incorporates the direct needs of operators, machine experts, and engineers, fostering a “Design Champion” network. This participatory approach significantly reduces training periods and minimizes resistance to new system implementations. Ultimately, the paper argues that modern human-centered design is not merely an aesthetic enhancement but a vital engineering strategy to transform accelerator interfaces from passive data displays into active, reliable “work partners” that promote safety, efficiency, and collaborative excellence.