[ Identification | Description | Input parameters | Links ]

# The `Sans_spheres` Component

Sample for Small Angle Neutron Scattering - hard spheres in thin solution, mono disperse.

## Identification

- Site:
- Author: P. Willendrup, K. Lefmann, L. Arleth
- Origin: Risoe
- Date: 19.12.2003

## Description

    Sample for use in a SANS instrument, models hard, mono disperse spheres in thin solution.
    The shape of the sample may be a filled box with dimensions
    xwidth, yheight, zdepth, a cylinder with dimensions radius and yheight,
    a filled sphere with radius.

    Example: Sans_spheres(R = 100, Phi = 1e-3, Delta_rho = 0.6, sigma_abs = 50, xwidth=0.01, yheight=0.01, zdepth=0.005)

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default |
R | AA | Radius of scattering hard spheres | 100 |
Phi | 1 | Particle volume fraction | 1e-3 |
Delta_rho | fm/AA^3 | Excess scattering length density | 0.6 |
sigma_abs | m^-1 | Absorption cross section density at 2200 m/s | 0.05 |
xwidth | m | horiz. dimension of sample, as a width | 0 |
yheight | m | vert . dimension of sample, as a height for cylinder/box | 0 |
zdepth | m | depth of sample | 0 |
radius | m | Outer radius of sample in (x,z) plane for cylinder/sphere | 0 |
target_x | m |  | 0 |
target_y | m | position of target to focus at | 0 |
target_z | m |  | 6 |
target_index | 1 | Relative index of component to focus at, e.g. next is +1 | 0 |
focus_xw | m | horiz. dimension of a rectangular area | 0 |
focus_yh | m | vert. dimension of a rectangular area | 0 |
focus_aw | deg | horiz. angular dimension of a rectangular area | 0 |
focus_ah | deg | vert. angular dimension of a rectangular area | 0 |
focus_r | m | Detector (disk-shaped) radius | 0 |

AT ( | , | , |  | ) RELATIVE |  |
ROTATED ( | , | , |  | ) RELATIVE |

## Links

- Source code for `Sans_spheres.comp`.
- The test/example instrument SANS.instr.

[ Identification | Description | Input parameters | Links ]