[ Identification | Description | Input parameters | Links ]

The TOFRes_sample Component

Sample for TOF resolution function calculation.

Identification

• Site:
• Author: KL, 10 October 2004
• Origin: Risoe
• Date: 1999

Description

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:
1. Hollow cylinder (Please note that the cylinder **must** be specified with both
a radius and a wall-thickness!)
2. A massive, rectangular box specified with dimensions xwidth, yheight, zdepth.
(i.e. **withouht** a thickness)

hollow cylinder shape **must** be specified with both a radius and a wall-thickness.
The box is

The scattered neutrons will have directions towards a given target and
detector arrival time in an interval of time_width centered on 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, time_bin=3e4, time_width=200, 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
f	1	Adaptive time-shortening factor	50
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	0

AT (	,	,		) RELATIVE		Generate
ROTATED (	,	,		) RELATIVE

Links

• Source code for TOFRes_sample.comp.

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[ Identification | Description | Input parameters | Links ]

Generated on mcstas 3.5.32

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Last Modified: Monday, 30-Jun-2025 11:05:10 CEST