Timing and Synchronization

A shared, precise clock lets distributed control nodes act together and lets measurements be fused correctly across the system.

Why a common time base matters

A plasma control system is distributed across many nodes: diagnostics, real-time computers, actuator controllers. For them to act as one system, they must agree on time. A shared clock lets a measurement taken on one node be aligned with an action on another, and lets the whole discharge run against one timeline.

Distributing the clock

A timing system distributes a precise clock and synchronizing signals to every node, often over dedicated fiber to avoid the variable delays of a general network. Nodes discipline their local clocks to this reference so that timestamps across the system are consistent to a known, small tolerance.

Triggers and events

Beyond a clock, the timing system broadcasts triggers and events: the moment breakdown should occur, the transition to flat-top, an off-normal event that all nodes must react to. Event distribution lets the whole system change behavior together at a defined instant rather than each node deciding independently.

Consequences of poor synchronization

If clocks drift or timestamps are wrong, fused state estimates are corrupted, because measurements meant to be simultaneous are combined as though they were not. Actions can be mistimed relative to the plasma. Synchronization error therefore directly enters the latency budget and the accuracy of state estimation.

In the Kronos program

Kronos specifies a timing and synchronization system so the fast loops of the Hyperion breeder and the burner generators share a common time base, letting the diagnostic pipeline deliver aligned data to the state estimator and letting event triggers coordinate phase transitions and off-normal responses across nodes. The design is validated in simulation ahead of construction.