Bio‑Quantum Dual‑Channel Sensor for Edge‑Plasma Diagnostics

Summary.An open, dual-channel diagnostic that correlates magnetic-field transients (OPM/NV magnetometer) with surface ROS activity (graphene-FET) near plasma edges. The instrument uses a single time-base with shared TTL triggers, bandwidth-aligned analysis (10–100 Hz decimation of the B-channel) and event-aligned averaging around dB/dt peaks. It is engineered to operate outside UHV (near-port), with realistic sensitivity/latency targets, a staged roadmap P0→P3, and a Zenodo-ready data schema for replication. Context (Aug 2025).Recent high-field HTS magnet progress (SPARC-class, ~12 T on-axis) compresses device size while increasing power densities and materials stress at the edge/divertor. This strengthens—not replaces—the need for near-port edge diagnostics. Our instrument provides coherent B↔ROS measurements to support PMI/process optimization without invasive in-vessel hardware. What’s in this release (v5.1.1). Adds explicit high-field context and clarifies OPM selection by site (prefer scalar OPM unless full field-nulling for SERF is available). Reiterates outside-UHV, near-port operation and the P0→P3 plan. No hardware schema changes vs v5.1; editorial + metadata only. System at a glance. Magnetic channel: commercial OPM (preferred for v5.1.1) or NV-diamond (upgrade path). ROS channel: GFET with either boronate or HRP-mimetic chemistry; optional bench-only reference (amperometric or Amplex Red) to validate LOD/drift. Analysis: magnitude-squared coherence C(f) (1–10 s windows), xcorr(t), and event-aligned averaging. Engineering: heat-pipe/water base, shielded DAQ, μ-metal where needed; < 45 °C at heads (acceptance