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

# The `Powder1` Component

General powder sample with a single scattering vector.

## Identification

- Author: E.M.Lauridsen, N.B.Christensen, A.B.Abrahamsen
- Origin: Risoe
- Date: 4.2.98
- Version: 1.29

## Description

    General powder sample with a single scattering vector. No multiple ,
    scattering, no incoherent scattering, no secondary extinction.
    The shape of the sample may be a cylinder of given radius or a box with
    dimensions xwidth, yheight, zthick.
    The efficient is highly improved when restricting the vertical scattering
    range on the Debye-Scherrer cone (with 'd_phi').
    You may use PowderN to use N scattering lines defined in a file.

    Example: Powder1(radius=0.015,yheight=0.05,q =1.8049,d_phi=0.07,pack=1,
          j=6,DW=1,F2=56.8,Vc=85.0054,sigma_a=0.463)

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
--- | --- | --- | ---
radius | m | Radius of sample in (x,z) plane | 0.01
yheight | m | Height of sample y direction | 0.05
q | AA^-1 | Scattering vector of reflection | 1.8049
d | AA | d-spacing for sample, overrides 'q' | 0
d_phi | deg,0-180 | Angle corresponding to the vertical angular range to focus to, e.g. detector height. 0 for no focusing | 0
pack | 1 | Packing factor | 1
j | 1 | Multiplicity of reflection | 6
DW | 1 | Debye-Waller factor of reflection | 1
F2 | fm^2 | Structure factor of reflection | 56.8
Vc | AA^3 | Volume of unit cell | 85.0054
sigma_a | fm^2 | Absorption cross section per unit cell at 2200 m/s | 0.463
xwidth | m | horiz. dimension of sample, as a width | 0
zthick | m | thickness of sample | 0
h | m | the same as yheight | 0

## Output parameters

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

## Links

- Source code for `Powder1.comp`.
- Old description, with explanation of focusing.
- Test results (not up-to-date).
- See also: Powder1, Powder2 and PowderN

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