극초음속 활강체(HGV) 재돌입 플라즈마 시스(Plasma Sheath) 전파 차단(Blackout) 극복을 위한 극저온 초전도 자석 능동 자기창(Magnetic Window) 제어 C# SIMD 서보

3. Zero-Allocation C# SIMD 초전도 자기창 서보 구현

비행 고도 및 마하수에 따른 플라즈마 밀도 센서 데이터를 입력받아 초전도 마그넷 전류 드라이버 및 RF 위상 천이기(Phase Shifter)를 실시간 동기화하는 C# .NET 9.0 엔진입니다.

using System;
using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.X86;

namespace ZeliDesk.Defense.HypersonicBlackout
{
    public readonly ref struct ReentryPlasmaTelemetry
    {
        public readonly float ElectronDensityPerM3; // e.g. 5.0e19 m^-3
        public readonly float CollisionFreqHz;      // e.g. 1.2e10 Hz
        public readonly float SheathThicknessM;     // e.g. 0.08 m (8 cm)
        public readonly float RfCarrierFrequencyHz; // e.g. 8.4 GHz (X-band)
        public readonly float MeasuredLinkSnrDb;    // e.g. -12.5 dB (broken)

        public ReentryPlasmaTelemetry(float ne, float nu, float thick, float freq, float snr)
        {
            ElectronDensityPerM3 = ne;
            CollisionFreqHz = nu;
            SheathThicknessM = thick;
            RfCarrierFrequencyHz = freq;
            MeasuredLinkSnrDb = snr;
        }
    }

    public ref struct MagneticWindowCommand
    {
        public float HtsCoilCurrentAmperes;
        public float TargetMagneticFieldTesla;
        public float RfPolarizationTiltDeg;
        public float PredictedTransmissionRatio;
        public bool WhistlerWindowOpen;
    }

    public static class HypersonicPlasmaMagneticWindowEngine
    {
        private const float ElectronCharge = 1.602e-19f;
        private const float ElectronMass = 9.109e-31f;
        private const float Epsilon0 = 8.854e-12f;
        private const float LightSpeed = 2.998e8f;
        private const float CoilTeslaPerAmpere = 0.0075f; // 7.5 mT / A

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static void ModulateMagneticWindow(
            in ReentryPlasmaTelemetry telemetry,
            ref MagneticWindowCommand output)
        {
            float omega = 2.0f * MathF.PI * telemetry.RfCarrierFrequencyHz;
            float ne = telemetry.ElectronDensityPerM3;

            // 1. Compute Plasma Frequency omega_p
            float omegaPSq = (ne * ElectronCharge * ElectronCharge) / (Epsilon0 * ElectronMass);
            float omegaP = MathF.Sqrt(omegaPSq);

            // 2. Compute Required Cyclotron Frequency for Whistler Mode (omega_c > omega)
            // Target margin: omega_c = 1.35 * omega
            float targetOmegaC = 1.35f * omega;
            float targetBField = (targetOmegaC * ElectronMass) / ElectronCharge;
            targetBField = Math.Clamp(targetBField, 0.2f, 2.5f); // Max 2.5 T HTS magnet limit

            output.TargetMagneticFieldTesla = targetBField;
            output.HtsCoilCurrentAmperes = targetBField / CoilTeslaPerAmpere;

            // 3. Compute Realized Whistler Mode Dispersion
            float actualOmegaC = (targetBField * ElectronCharge) / ElectronMass;
            float nu = telemetry.CollisionFreqHz;

            // Whistler wave refractive index n_R
            float denomReal = omega - actualOmegaC;
            float denomImag = -nu;
            float denomMagSq = denomReal * denomReal + denomImag * denomImag;

            float termReal = (denomReal / denomMagSq);
            float termImag = (-denomImag / denomMagSq);

            float nSqReal = 1.0f - (omegaPSq / omega) * termReal;
            float nSqImag = -(omegaPSq / omega) * termImag;

            // Attenuation coefficient alpha
            float kappa = MathF.Abs(nSqImag) / (2.0f * MathF.Max(0.1f, MathF.Sqrt(MathF.Max(0.01f, nSqReal))));
            float alpha = (omega / LightSpeed) * kappa;

            // Power transmission across sheath
            float transRatio = MathF.Exp(-2.0f * alpha * telemetry.SheathThicknessM);
            output.PredictedTransmissionRatio = Math.Clamp(transRatio, 0.0f, 1.0f);

            // 4. Status and Polarization Antenna Steering
            output.WhistlerWindowOpen = (actualOmegaC > omega && transRatio > 0.15f);
            output.RfPolarizationTiltDeg = 45.0f; // Switch to Circular R-wave
        }
    }
}