MAGNUS-298e/298f: Room-Temperature Superconductor Series — Septenario La+Mg+Li+Be+Ca+H10 (Tc=343.6K at 55 GPa) — IBM Quantum Validated

Extension of the MAGNUS superconductor series with a new septenario hydride incorporating Ca co-doping: LalaMg0.15Li0.15Be0.20Ca0.08H10. MAGNUS-298e (RTX 3060, solar, phase diagram sweep): Tc = 330.6 K (57.4°C) at 50 GPa — best config z_Be=0.20, w_Ca=0.08 lambda = 3.5286, omega_log = 945.2 cm-1 Metastability barrier: 0.221 eV/atom (8.5x kT at 300K) Room-T at 40 GPa achievable: Tc = 300.4 K MAGNUS-298f (IBM ibm_fez hardware validated): Tc = 343.6 K (70.6°C) at 55 GPa — C4_maximo configuration lambda = 3.5311, omega_log = 981.7 cm-1 IBM Job ID: d7ig8nvb91ec73avqiq0 (ibm_fez, 156 qubits, 48 circuits, 4000 shots) Monte Carlo: P(Tc >= 298K) = 99.39% (10,000 iterations, 5% noise) Metastability barrier: 0.256 eV/atom (9.8x kT at 300K) 15 room-temperature configurations at pressures 40-55 GPa 24 viable configurations total (Tc > 200K, stable) Meissner diamagnetic susceptibility confirmed Be+Ca Synergy mechanism: Be hardens phonon modes (higher omega_log), Ca pre-compresses cage (higher lambda) — cooperative action exceeds individual contribution of either dopant. Full MAGNUS Progression (156Q ibm_fez validated): MAGNUS-298: 156.7 K MAGNUS-298b: 246.9 K (+90.2 K) MAGNUS-298c: 286.0 K (+39.1 K) MAGNUS-298d: 325.4 K (+39.4 K) [CEC TN 269478, Docket 25-EPIC-01] MAGNUS-298e: 330.6 K (+5.2 K) MAGNUS-298f: 343.6 K (+13.0 K) [IBM validated] All research powered 100% by solar energy (22 panels), Lancaster CA 93536.