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

The V_sample Component

Vanadium sample.

Identification

Description

A Double-cylinder shaped incoherent scatterer (a V-sample)
No multiple scattering. Absorbtion included.
The shape of the sample may be a box with dimensions xwidth, yheight, zthick.
The area to scatter to is a disk of radius 'focus_r' situated at the target.
This target area may also be rectangular if specified focus_xw and focus_yh
or focus_aw and focus_ah, respectively in meters and degrees.
The target itself is either situated according to given coordinates (x,y,z),
or defined with the relative target_index of the component to focus
to (next is +1).
This target position will be set to its AT position. When targeting to
centered components, such as spheres or cylinders, define an Arm component
where to focus to.

Example: V_sample(radius_i=0.001,radius_o=0.01,h=0.02,focus_r=0.035,pack=1,
          target_index=1)

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
radius_i m Inner radius of sample in (x,z) plane 0
radius_o m Outer radius of sample in (x,z) plane 0.01
h m Height of sample y direction 0.05
focus_r m Radius of disk containing target. Use 0 for full space 0
pack 1 Packing factor 1
frac 1 MC Probability for scattering the ray; otherwise penetrate 1
target_x - 0
target_y m position of target to focus at 0
target_z - 0.235
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
xwidth m horiz. dimension of sample, as a width 0
yheight m vert. dimension of sample, as a height 0
zthick m thickness of sample 0
sig_a barns Absorbtion cross section pr. unit cell 5.08
sig_i barns Incoherent scattering cross section pr. unit cell 4.935
V0 AA^3 Unit cell volume 13.827
target_index 1 relative index of component to focus at, e.g. next is +1 0

Output parameters

Name Unit Description Default
StructVarsV  
VarsV  

Links


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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Fri Apr 24 19:09:20 2009