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

# The `Powder2` Component

KL, 28.09.01 (two lines) KL, 22.05.03 (background) General powder sample with two scattering vectors and incoherent backgorund.

## Identification

- Author: E.M.Lauridsen, N.B.Christensen, A.B.Abrahamsen
- Origin: McStas release
- Date: 4.2.98
- Version: 1.2
- Modification history:
  - KL, KN 20.3.98 (rewrite)

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
--- | --- | --- | ---
d_phi0 | deg | Focussing angle corresponding to the vertical dimensions of the detector placed at the right distance |
radius | m | Radius of sample in (x,z) plane |
focus_r | m | Focussing radius of incoherent | 0
h | m | Height of sample y direction |
pack | 1 | Packing factor |
Vc | AA^3 | Volume of unit cell |
sigma_a | fm^2 | Absorption cross section per unit cell at 2200 m/s |
sigma_inc | fm^2 | Incoherent cross section per unit cell |
frac |  |  |
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
j_1 | 1 | Multiplicity of reflection |
q_1 | AA^-1 | Scattering vector of reflection |
F2_1 | fm^2 | Structure factor of reflection |
j_2 |  |  |
q_2 |  |  |
F2_2 |  |  |
w_1 | AA^-1 | Intrinsic line broadening of reflection |
w_2 |  |  |
DW | 1 | Debye-Waller factor of reflection |
target_x |  |  | 0
target_y | m | position of target to focus at | 0
target_z |  |  | 0
int target_index |  |  | 0

## Output parameters

Name | Unit | Description | Default
--- | --- | --- | ---
my_s_v2 |  |  |
my_a_v |  |  |
q_v |  |  |

## Links

- Source code for `Powder2.comp`.
- Old description, with explanation of focusing.
- Test results (not up-to-date).

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