pdnkit: CavityModel uses HJ roughness#52
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CavityConfig gains conductor_roughness_rq_m. When > 0, the cavity impedance routine augments the dielectric loss tangent at each frequency with K_HJ * (delta_s / d), the standard parallel-plate surface-loss term scaled by Hammerstad-Jensen roughness. Default 0 = smooth, preserves the bit-for-bit old behavior. Typical values: 0.4 um (smooth ED foil), 1 um (standard rolled), 2-5 um (black-oxide-treated). Effect is biggest at high frequency and near resonances where Q matters. 3 tests in [cavity-hj][validation]: * rq = 0 matches the old result bit-for-bit * rq = 5 um damps the cavity peak at the analytic TM10 freq * off-resonance change is small (< 5 percent)
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CavityConfiggainsconductor_roughness_rq_m. When > 0, the cavity routine augments the dielectric loss tangent at each frequency withK_HJ * (delta_s / d)-- the parallel-plate surface-loss term scaled by Hammerstad-Jensen roughness.Default 0 keeps the existing behavior bit-for-bit. Typical Rq:
Effect concentrates near resonances (where Q matters) and at high frequency (where δ_s shrinks toward Rq).
3 tests in
[cavity-hj][validation]: zero roughness identical to old; 5 µm Rq damps the analytic TM10 peak; off-resonance change is small (< 5%).