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Last change
on this file since 54b9ad2 was
79492222,
checked in by krzywon, 10 years ago
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Changed the file and folder names to remove all SANS references.
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-
Property mode set to
100644
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File size:
1.6 KB
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[a8d3b4f] | 1 | #ifndef STAR_POLYMER_H |
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| 2 | #define STAR_POLYMER_H |
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| 3 | |
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| 4 | /** |
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| 5 | This software was developed by Institut Laue-Langevin as part of |
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| 6 | Distributed Data Analysis of Neutron Scattering Experiments (DANSE). |
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| 7 | |
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| 8 | Copyright 2012 Institut Laue-Langevin |
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| 9 | |
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| 10 | **/ |
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| 11 | |
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| 12 | /** |
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| 13 | Scattering model class for 'Star polymer with Gaussian statistics' |
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| 14 | with |
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| 15 | P(q) = 2/{fv^2} * (v - (1-exp(-v)) + {f-1}/2 * (1-exp(-v))^2) |
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| 16 | where |
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| 17 | - v = u^2f/(3f-2) |
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| 18 | - u = <R_g^2>q^2, where <R_g^2> is the ensemble average radius of |
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| 19 | gyration squared of an arm |
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| 20 | - f is the number of arms on the star |
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| 21 | |
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| 22 | **/ |
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| 23 | |
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| 24 | // [PYTHONCLASS] = StarPolymer |
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| 25 | // [DISP_PARAMS] = arms, R2, scale, background |
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| 26 | // [DESCRIPTION] = <text> Scattering model class for 'Star polymer with Gaussian statistics' |
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| 27 | // with |
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| 28 | // P(q) = 2/{fv^2} * (v - (1-exp(-v)) + {f-1}/2 * (1-exp(-v))^2) |
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| 29 | // where |
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| 30 | // - v = u^2f/(3f-2) |
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| 31 | // - u = <R_g^2>q^2, where <R_g^2> is the ensemble average radius of |
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| 32 | // giration squared of an arm |
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| 33 | // - f is the number of arms on the star |
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| 34 | // </text> |
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| 35 | // [FIXED] = |
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| 36 | // [ORIENTATION_PARAMS] = |
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| 37 | |
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| 38 | #include "parameters.hh" |
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| 39 | |
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| 40 | class StarPolymer { |
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| 41 | |
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| 42 | public: |
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| 43 | |
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| 44 | // Model parameters |
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| 45 | |
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| 46 | /// Number of arms in the model |
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| 47 | // [DEFAULT]=arms=3 |
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| 48 | Parameter arms; |
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| 49 | |
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| 50 | /// Ensemble radius of gyration squared of an arm [A] |
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| 51 | // [DEFAULT]=R2=100.0 [A] |
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| 52 | Parameter R2; |
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| 53 | |
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| 54 | /// Scale factor |
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| 55 | // [DEFAULT]=scale=1.0 |
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| 56 | Parameter scale; |
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| 57 | |
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| 58 | /// Background [1/cm] |
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| 59 | // [DEFAULT]=background=0 [1/cm] |
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| 60 | Parameter background; |
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| 61 | |
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| 62 | StarPolymer(); |
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| 63 | |
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| 64 | // Operators to get I(q) |
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| 65 | double operator()(double q); |
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| 66 | double operator()(double qx, double qy); |
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| 67 | double calculate_ER(); |
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| 68 | double calculate_VR(); |
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| 69 | double evaluate_rphi(double q, double phi); |
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| 70 | |
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| 71 | }; |
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| 72 | |
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| 73 | |
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| 74 | |
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| 75 | #endif |
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