[ Identification | Description | Input parameters | Output parameters | Links ]

`Lens`

Component-
**Author:**C. Monzat/E. Farhi/S. Desert/G. Euzen -
**Origin:**ILL/LLB -
**Date:**2009 -
**Version:**$Revision 1.0$ - differs from 1.12b version only by corrected typo in author name

Refractive Lens with absorption, incoherent scattering and surface imperfection. Geometry may be: spherical (use r1 and r2 to specify radius of curvature), planar (use phiy1 and phiy2 to specify rotation angle of plane w.r.t beam) or parabolic (use focus1 and focus2 as optical focal length). The lens cross-section is seen as a 2*radius disk from the beam Z axis. Usually, you should stack more than one of these to get a significant effect on the neutron beam, so-called 'compound refractive lens'. The focal length for N lenses with focal 'f' is f/N. Common material: MgF2: density=3.148,weight=62.3018,sigma_coh=11.74,sigma_inc=0.0816,sigma_abs=0.0822 diamond: density=3.52,weight=12.01,sigma_coh=5.551,sigma_inc=0.001,sigma_abs=0.0035 Quartz/silica:density=2.53,weight=60.08,sigma_coh=10.625,sigma_inc=0.0056,sigma_abs=0.1714 perfluoropolymer Example: Lens(r1=0.025,r2=0.025, thickness=0.001,radius=0.0150) %BUGS parabolic shape is not fully validated yet, but should do still...

Name | Unit | Description | Default |
---|---|---|---|

r1 | m | radius of the first circle describing the lens. r>0 means concave face, r<0 means convex, r=0 means plane | 0 |

r2 | m | radius of the second circle describing the lens r>0 means concave face, r<0 means convex, r=0 means plane | 0 |

focus1 | m | focal of the first parabola describing the lens | 0 |

focus2 | m | focal of the second parabola describing the lens | 0 |

phiy1 | deg | angle of plane1 (r1=0) around y vertical axis | 0 |

phiy2 | deg | angle of plane2 (r2=0) around y vertical axis | 0 |

thickness | m | thickness of the lens between its two surfaces | 0.001 |

radius | m | radius of the lens section, e.g. beam size | 0.015 |

sigma_coh | barn | coherent cross section | 11.74 |

sigma_inc | barn | incoherent cross section | 0.0816 |

sigma_abs | barn | thermal absorption cross section | 0.0822 |

density | g/cm3 | density of the material for the lens | 3.148 |

weight | g/mol | molar mass of the material | 62.3018 |

p_interact | 1 | MC Probability for scattering the ray; otherwise transmit | 0.1 |

focus_aw | deg | vertical angle to forward focus after scattering | 10 |

focus_ah | deg | horizontal angle to forward focus after scattering | 10 |

RMS | Angs | root mean square roughness of the surface | 0 |

Name | Unit | Description | Default |
---|---|---|---|

rho |
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bc |
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my_s |
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my_a_v |
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mean_n |
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events |

- Source code for
`Lens.comp`

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[ Identification | Description | Input parameters | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Tue Aug 10 11:45:54 2010