fix: trapped particle flux
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README.md
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README.md
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@ -137,7 +137,7 @@ $$
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<div align=center><img src="docs/ExFit-trapped-electron.png" style="max-width: 80%;"><br /></div>
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2. 质子
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与电子保持一致，额外考虑幂律平移模型$j=j_0(E-\beta)^{-\alpha}$，同电子进行`BIC test`，最终选用幂律平移模型$j_0=559.76377,\ \alpha=2.40873,\ \beta=-1.53424$。
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与电子保持一致，幂律模型修改为$j=j_0(E-\beta)^{-\alpha}$，进行`BIC test`，最终选用幂律模型$j_0=559.76377,\ \alpha=2.40873,\ \beta=-1.53424$。
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<div align=center>
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@ -151,19 +151,19 @@ $$
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<div align=center><img src="docs/ExFit-trapped-proton.png" style="max-width: 80%;"><br /></div>
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## 辐射源设置
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使用`Geant4`的`General Particle Source`（`GPS`）生成源，考虑在`World`球面上均匀随机发射粒子（各向同性），保证入射方向为球内，则球面上的总通量为：
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使用`Geant4`的`General Particle Source`（`GPS`）生成源，考虑在`World`球面上均匀随机发射粒子（各向同性），保证入射方向为球内，则球面上的计数率为：
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$$
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F = A\int_{E_a}^{E_b} \phi(E)\mathrm{d}E,\ A=4\pi R^2
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$$
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`GCR`的单位为$\mathrm{m^{-2}sr^{-1}s^{-1}}$，乘以$4\pi A$即可得到通量；俘获辐射的单位为$\mathrm{cm^{-2}s^{-1}}$，乘以$A$即可得到通量，最终结果如下表所述。
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`GCR`的单位为$\mathrm{m^{-2}sr^{-1}s^{-1}}$，乘以$4\pi A$即可得到计数率；俘获辐射的单位为$\mathrm{cm^{-2}s^{-1}}$，乘以$A$即可得到计数率。经过检验，模型中使用的外壳（3层，2mm 铝 + 10mm 芳纶 + 5mm 铝）能够抵挡能量在$50\ \mathrm{MeV}$以下的质子和能量在$100\ \mathrm{keV}$以下的电子，最终结果如下表所述。
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<div align=center>
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| Partical | Model | $E_{min}(\mathrm{MeV})$ | $E_{max}(\mathrm{MeV})$ | Flux($\mathrm{s^{-1}}$) |
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|:--------:|:--------------------------------------------------------------------:|:-----------------------:|:-----------------------:|:-----------------------:|
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| $e^{-}$ | $j=j_0e^{-\frac{E}{E_0}}$ | 0.04 | 10 | 1.91227E+12 |
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| `p` | $j=j_0(E-\beta)^{-\alpha}$ | 0.1 | 1000 | 5623595363 |
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| $e^{-}$ | $j=j_0e^{-\frac{E}{E_0}}$ | 0.1 | 10 | 9.23242E+11 |
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| `p` | $j=j_0(E-\beta)^{-\alpha}$ | 50 | 1000 | 42853994.15 |
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| `H` | $\frac{C_1\beta^{\alpha-1}}{pc}\left(\frac{pc}{pc+C_2}\right)^{C_3}$ | 200 | 100000 | 12854310.92 |
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| `He` | $C_1e^{-C_2E}(1-e^{-C_3E+C_4})$ | 200 | 100000 | 1718828.12 |
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| `Li` | $C_1e^{-C_2E}(1-e^{-C_3E+C_5})$ | 200 | 100000 | 12982.36284 |
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@ -195,6 +195,41 @@ $$
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</div>
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考虑到`GCR`和俘获辐射计数率相差太大，分为两部分分别进行模拟，同时按比例进行放缩。
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### GCR
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电子计数率与质子计数率之比约为`21544`，设置质子的源强为`1`，模拟`923285`个入射事件（数值上为$F\times10^{-6}\ \mathrm{s}$），因此最终的剂量需要乘以$10^6\ \mathrm{s^{-1}}\times30\ \mathrm{d}\times86400\ \mathrm{s/d}$倍。
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```macro
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/gps/source/add 21544
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/gps/particle e-
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/gps/pos/type Surface
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/gps/pos/shape Sphere
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/gps/pos/radius 15 m
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/gps/ene/type Exp
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/gps/ene/min 100 keV
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/gps/ene/max 10 MeV
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/gps/ene/ezero 0.0824
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/gps/ang/type iso
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/gps/ang/maxtheta 90 deg
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/gps/source/add 1
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/gps/particle proton
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/gps/pos/type Surface
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/gps/pos/shape Sphere
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/gps/pos/radius 15 m
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/gps/ene/type Pow
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/gps/ene/min 200 MeV
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/gps/ene/max 100 GeV
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/gps/ene/alpha 2.40873
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/gps/ang/type iso
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/gps/ang/maxtheta 90 deg
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/run/beamOn 923285
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```
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### 俘获辐射
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假定`Co`的计数率为1，设定其他粒子的计数率，模拟`707013`个入射事件，因此最终的剂量需要乘以$20.9\ \mathrm{s^{-1}}\times30\ \mathrm{d}\times86400\ \mathrm{s/d}$倍。
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## 空间站建模
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1. 尺寸与分区[^6]
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<div align=center><img src="docs/size.webp" style="max-width: 50%;"></div>
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@ -0,0 +1,28 @@
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# 多线程设置
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/run/numberOfThreads 1
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# verbose
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/control/verbose 1
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/run/verbose 0
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/event/verbose 0
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/tracking/verbose 0
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/gps/verbose 0
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# 初始化
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/run/initialize
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# 电子射程
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/gps/particle e-
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/gps/energy 100 keV
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/gps/position 0 0 5 m
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/gps/ang/type iso
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/gps/ang/maxphi 60 deg
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/gps/ang/maxtheta 20 deg
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# 质子射程
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/gps/particle proton
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/gps/energy 50 MeV
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/gps/position 0 0 5 m
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/gps/ang/type iso
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/gps/ang/maxphi 60 deg
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/gps/ang/maxtheta 20 deg
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18
electron.mac
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electron.mac
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@ -13,7 +13,7 @@
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/gps/source/clear
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# Trapped electron
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/gps/source/add 1
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/gps/source/add 21544
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/gps/particle e-
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/gps/pos/type Surface
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/gps/pos/shape Sphere
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@ -25,5 +25,19 @@
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/gps/ang/type iso
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/gps/ang/maxtheta 90 deg
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/gps/source/add 1
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/gps/particle proton
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/gps/pos/type Surface
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/gps/pos/shape Sphere
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/gps/pos/radius 15 m
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/gps/ene/type Pow
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/gps/ene/min 200 MeV
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/gps/ene/max 100 GeV
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/gps/ene/alpha 2.40873
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/gps/ang/type iso
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/gps/ang/maxtheta 90 deg
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/run/beamOn 923285
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# list
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/gps/source/list
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/gps/source/list
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@ -229,6 +229,19 @@ G4VPhysicalVolume* DetectorConstruction::Construct() {
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G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld, G4Material::GetMaterial("Vacuum"), "World");
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G4VPhysicalVolume* physicsWorld = new G4PVPlacement(0, G4ThreeVector(), logicWorld, "World", 0, false, 0, true);
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// Debug for particle range
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// G4Box* solidPlane1 = new G4Box("Plane1", 10 * m, 10 * m, 2 * mm);
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// G4LogicalVolume* logicPlane1 = new G4LogicalVolume(solidPlane1, G4Material::GetMaterial("AluminumAlloySeries5"), "Plane1");
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// new G4PVPlacement(0, G4ThreeVector(), logicPlane1, "Plane1", logicWorld, false, 0, true);
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// G4Box* solidPlane2 = new G4Box("Plane2", 10 * m, 10 * m, 10 * mm);
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// G4LogicalVolume* logicPlane2 = new G4LogicalVolume(solidPlane2, G4Material::GetMaterial("Taparan"), "Plane2");
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// new G4PVPlacement(0, G4ThreeVector(0, 0, -6), logicPlane2, "Plane2", logicWorld, false, 0, true);
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// G4Box* solidPlane3 = new G4Box("Plane3", 10 * m, 10 * m, 5 * mm);
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// G4LogicalVolume* logicPlane3 = new G4LogicalVolume(solidPlane3, G4Material::GetMaterial("AluminumAlloySeries5"), "Plane3");
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// new G4PVPlacement(0, G4ThreeVector(0, 0, -14.5), logicPlane3, "Plane3", logicWorld, false, 0, true);
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// 节点舱
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ConstructSectionSphere(logicWorld, (5.18 + 0.33) * m);
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// 过渡段 1
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