1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // |
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28 | /////////////////////////////////////////////////////////////////////////// |
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29 | // |
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30 | // Rough model describing a gamma function distributed radiator of X-ray |
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31 | // transition radiation. XTR is considered to flux after radiator! |
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32 | // Thicknesses of plates and gas gaps are distributed according to gamma |
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33 | // distribution. x are thicknesses of plates or gas gaps: |
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34 | // |
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35 | // p(x) = (alpha/<x>)^alpha * x^(alpha-1) * std::exp(-alpha*x/<x>) / G(alpha) |
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36 | // |
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37 | // G(alpha) is Euler's gamma function. |
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38 | // Plates have mean <x> = fPlateThick > 0 and power alpha = fAlphaPlate > 0 : |
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39 | // Gas gaps have mean <x> = fGasThick > 0 and power alpha = fAlphaGas > 0 : |
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40 | // We suppose that: |
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41 | // formation zone ~ mean thickness << absorption length |
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42 | // for each material and in the range 1-100 keV. This allows us to simplify |
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43 | // interference effects in radiator stack (GetStackFactor method). |
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44 | // |
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45 | // |
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46 | // History: |
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47 | // |
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48 | // 03.10.05 V. Grichine, first version |
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49 | // |
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50 | |
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51 | #ifndef G4XTRGammaRadModel_h |
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52 | #define G4XTRGammaRadModel_h 1 |
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53 | |
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54 | #include "G4VXTRenergyLoss.hh" |
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55 | |
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56 | class G4XTRGammaRadModel : public G4VXTRenergyLoss |
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57 | { |
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58 | public: |
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59 | |
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60 | G4XTRGammaRadModel (G4LogicalVolume *anEnvelope, |
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61 | G4double,G4double, |
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62 | G4Material*,G4Material*, |
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63 | G4double,G4double,G4int, |
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64 | const G4String & processName = "XTRgammaRadiator" ); |
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65 | virtual ~G4XTRGammaRadModel (); |
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66 | |
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67 | // Pure virtual function from base class |
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68 | |
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69 | G4double GetStackFactor( G4double energy, G4double gamma, G4double varAngle); |
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70 | |
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71 | private: |
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72 | |
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73 | // G4double fAlphaPlate, fAlphaGas ; |
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74 | }; |
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75 | |
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76 | #endif |
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