Sensor edge to guarded trigger

Pulsed FRC reactors hit fusion temperatures, but the control loop must preempt macroscopic instabilities before they breach confinement. SCPN-MIF-Core moves the critical-path intervention from software toward combinatorial logic on FPGA fabric.

The merging equation

Whether two compressed plasmoids lock into one stable object or tear apart is a synchronisation problem in an accelerating frame:

Doppler-Kuramoto merge model
$$\dot\theta_i \;=\; \omega_i(t) \;+\; \sum_{j} K_{ij}\,\sin\!\left(\theta_j - \theta_i - \alpha\right), \qquad \omega_i(t) = \omega_{i0} + \dot\omega_i\, t$$

A time-varying natural frequency $\omega_i(t)$ captures the accelerating merge frame; phase-lag $\alpha$ and coupling $K_{ij}$ set the interaction. RK4 integrates against the closed-form $\theta(t)=\theta_0+\omega_{i0}t+\tfrac12\dot\omega_i t^2$; the merge-window monitor decides fire / no-fire before confinement is lost.

Engineering boundary: the sub-50 ns sensor-to-actuator path is the engineering target. The delivered formal bound is expressed in clock cycles (timing:cycle-budget-formal); named-device post-route and measured nanosecond evidence remain timing:post-route-hardware-gated and timing:e2e-hil-hardware-gated.

Signal chain
B-dot + AER
ADC normalisation, spike-rate quantisation, buffer decoding, and replay from the B-dot / Hall / flux front end.
Moving frame
Doppler-Kuramoto synchronisation and UPDE remapping for the pulsed FRC motion against the compression field.
Merge window
Lifecycle scheduling, capacitor-bank dynamics, safety checks, and Petri-net control around the lock window.
Trigger fabric
Clocked debounced single-shot logic (MIF-008) with a registerless fast-veto lane. Two trigger lanes: debounced safety-qualified and combinational fast-veto.
Evidence
Python/Verilator cosimulation, SymbiYosys safety/liveness proofs, and content-addressed manifests.
Multi-language acceleration chain

Kuramoto kinematic-merging equations compile into bit-true Q8.8 SystemVerilog through the sibling sc-neurocore engine. Native hot paths use a fastest-measured dispatch with a transparent pure-Python fallback.

# Rust dispatch backend with pure-Python reference fallback
pip install "scpn-mif-core[accelerated]"
Sibling contracts

SCPN-MIF-Core consumes accepted FRC equilibrium, Hall/flux, compression, MRTI, tilt, and compression-coupled recovery surfaces from scpn-fusion-core through explicit contract tests. FUSION-owned physics kernels are detected through contracts, not silently reimplemented or dispatched locally.