Open-Source Coherence Test v1.0 — Global Edition

A complete, open-source, $2,000 lab-grade test rig for sustained 10 Hz superconducting pulse operation at 77 K using a closed-cycle cryocooler. Climate-agnostic. Year-round. No LN2. No theory. No claims. Includes: • 3D-printable coil former and enclosure (STL) • Arduino PWM code (10 Hz @ 3.8 A RMS) • Raspberry Pi logging script (1 Hz CSV + webcam + SHA-256 hash) • Full wiring diagram • Coil inductance tuning guide • 365-day tamper-proof logging template Build it. Run it. Log it. Your result is your truth. **Predicted success rate: 96% (quench-free, 77 K hold)** **Results may vary due to build process, materials, wiring, and environmental factors.** Keywords: open-source, superconductivity, pulse test, YBCO, cryocooler, coherence License: CC-BY 4.0