Making a fusion machine work as one system: software roles in ITER's control integration

Fusion work is not limited to manufacturing magnets or vacuum vessels. It also includes connecting equipment made by different companies so that it can function as one operating system. ITER's central control system, CODAC, provides an introduction to the links between development, testing and handover that software and controls companies need to understand.

A handbook defining equipment and control design rules and a common software environment support that integration. I&C means instrumentation and control: receiving sensor values, sending commands to equipment and displaying its condition.

However, central control is not responsible for everything. Equipment-protection interlocks and personnel and nuclear safety systems operate independently of CODAC. When considering a contract scope, first establish the boundary between operational control and protection or safety. Architecture and division of roles

Developers use mini-CODAC, an environment providing operator interfaces, alarms and data archiving in place of central facilities. The official March 2026 overview describes its use in development and testing, including factory acceptance tests, with the resulting configuration data reused in the final installation. Development-environment overview

Controls also require buildings for computers and space for cabling. ITER's May 9, 2022 report introduced the Control Building under construction and the server room accommodating connections between control cubicles. Control Building construction record

For a supplier, delivering an interface does not finish the job. Test configurations and delivered configurations need to correspond, changes must be traceable, and site personnel must be able to maintain the system. This is a practical inference from the documented development process.

The article describes separating central computers and services by system to reduce the spread of changes to other equipment. Delivered control cubicles also need to meet local electrical standards and environmental conditions, in addition to connecting power and communications.

The opportunity is not limited to writing an entire fusion-specific software system from scratch. Connecting equipment to an existing common platform, defining signal semantics and testing additions or updates can also create a role. The computing facilities in the lead photograph are part of the infrastructure for handling information generated by the machine.

A separate May 9, 2023 article illustrated the distinction between permission to monitor equipment and permission to operate it. Operating authority depends on the user's qualifications and the location responsible for commissioning. Centralization of controls and permissions

These are historical records of installation and operational preparation. The photographs show those periods, not the current status of every system. They nevertheless demonstrate the difference between delivering an interface and handing over a system ready for operation.

A common platform does not mean unconditional access to distribution or support. Official guidance requires registration by institutions and contractors participating in ITER development. For each opportunity, check participation conditions, the scope of source-code and configuration handover, maintenance duration and the selected software version.

Value in fusion controls lies in connecting individual equipment performance with other systems and human work. Companies supplying manufacturing controls and software may be able to apply their experience to that task.