source: sasview/src/sas/models/include/starpolymer.h @ 79492222

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Last change on this file since 79492222 was 79492222, checked in by krzywon, 8 years ago

Changed the file and folder names to remove all SANS references.

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