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

We propose a pragmatic, modular roadmap for a dual‑channel diagnostic that correlates magnetic field dynamics with reactive‑oxygen‑species (ROS) activity near the edge of plasma devices. Relative to earlier concept notes, v5 replaces unrealistic magneto‑optic targets and radiative‑cooling assumptions with implementable modules: (i) a commercial optically‑pumped magnetometer (OPM) or NV‑diamond magnetometer for sensitivity, and (ii) a graphene‑FET (GFET) biochemical channel calibrated to peroxides/ROS with realistic bandwidth. We detail SNR models, thermal management compatible with lab or facility conditions, a stepwise validation plan (P0–P3), and an initial bill of materials. The goal is to enable open, reproducible correlation studies between magnetic transients and surface chemistry at the plasma boundary.