Structural Health Monitoring Loop
Strain, vibration, and thermal sensors across the vessel and cocoon feed L1 and L3 so structural limits are respected in real time and over the machine's life.
Watching the structure
The breeder's CrMoNbV vessel, the carbon-fiber cocoon, and the magnet support structure carry large, cyclic electromagnetic and thermal loads. Kronos instruments them with strain gauges, accelerometers, and thermal sensors, and L1 monitors these so that a structural limit is treated as an operating constraint in real time, not just a design-book number.
Fast vs slow
Structural health spans timescales. Fast: a sudden strain step or vibration signature — a conductor motion, a support slip — is a real-time cue that can arm the quench detector or trigger a protective response. Slow: strain and thermal cycling trend over pulses and campaigns, feeding fatigue and remaining-life estimates in the L3 twin's thermomechanics module.
What L1 provides
- Real-time strain envelope checks on the vessel and magnet structure.
- Vibration monitoring for mechanical anomalies.
- Thermal-gradient monitoring across the cocoon and vessel.
- Fast flags to protection; slow trends to structural-health analytics.
The REBCO strain and ICE-PISTON preload loops are the magnet-specific members of this monitoring family; the vessel and cocoon add the surrounding structure. Together they give a complete picture of the machine's mechanical state each cycle.
From monitoring to action
When a fast structural signal crosses a limit, L1 acts within its deterministic window — the same discipline as thermal or quench protection. When a slow trend approaches a fatigue limit, the twin flags it for maintenance scheduling and operating-envelope adjustment. Structural health is thus both an immediate interlock input and a long-horizon planning input, spanning the L1/L3 boundary.