An inelastic sample with completely uniform scattering in both solid angle
and energy. This sample is used together with the TOFRes_monitor component
and (optionally) the mcresplot front-end to compute the resolution
function of all time-of-flight instruments.
The method of time focusing is used to optimize the simulations.
The shape of the sample is either a hollow cylinder or a rectangular box. The
hollow cylinder shape is specified with an inner and outer radius.
The box is specified with dimensions xwidth, yheight, zdepth.
The scattered neutrons will have directions towards a given target and
energies between E0-dE and E0+dE, where E0 is calculated from the position
and width of the time bin.
This target area is default disk shaped, but 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 setting the relative target_index of the component to focus at
(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 at.
Example: TOFRes_sample(thickness=0.001, radius=0.01, yheight=0.04, focus_xw=0.025, focus_yh=0.025, E0=14.6,dE=2, target_x=0, target_y=0, target_z=1)

Input parameters

Parameters in boldface are required;
the others are optional.

Name

Unit

Description

Default

thickness

m

Thickness of hollow cylinder in (x,z) plane

0

radius

m

Outer radius of hollow cylinder

0.01

yheight

m

vert. dimension of sample, as a height

0.05

focus_r

m

Radius of sphere containing target

0.05

time_bin

us

position of time bin

20000

time_width

us

width of time bin

10

target_x

0

target_y

m

position of target to focus at

0

target_z

.5

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

zdepth

m

depth of sample

0

target_index

1

relative index of component to focus at, e.g. next is +1