[ Identification | Description | Input parameters | Links ]

The Union_abs_logger_1D_space Component

A sample component to separate geometry and phsysics

Identification

• Site:
• Author: Mads Bertelsen
• Origin: ESS DMSC
• Date: 19.06.20

Description

Part of the Union components, a set of components that work together and thus
separates geometry and physics within McStas.
The use of this component requires other components to be used.

1) One specifies a number of processes using process components
2) These are gathered into material definitions using Union_make_material
3) Geometries are placed using Union_box/cylinder/sphere, assigned a material
4) Logger and conditional components can be placed which will record what happens
5) A Union_master component placed after all of the above

Only in step 5 will any simulation happen, and per default all geometries
defined before this master, but after the previous will be simulated here.

There is a dedicated manual available for the Union_components

This component is an absorption logger, and thus placed in point 4) above.

A absorption logger will log something for each absorption event happening
in the geometry or geometries on which it is attached. These are specified
in the target_geometry string. By leaving it blank, all geometries are
logged, even the ones not defined at this point in the instrument file.
Multiple geometries are specified as a comma separated list.

This absorption logger stores the absorbed weight as a function of height
in a histogram. It is expected this abs logger will often be attached to a
cylindrical geometry, and so if the abs logger has the same position and
orientation it will measure absorption along the axis of symmetry. This
makes it easy to create simple tubes, and it is even possible to include
the detector casing and similar to improve the realism of the simulation.

This absorption logger needs to be placed in space, the position is recorded in
the coordinate system of the logger component.

It is possible to attach one or more conditional components to this absorption
logger. Such a conditional component would impose a condition on the state of
the neutron after the Union_master component that executes the simulation,
and the absorption logger will only record the event if this condition is true.

To use the logger_conditional_extend function, set it to some integer value n
and make and extend section to the master component that runs the geometry.
In this extend function, logger_conditional_extend[n] is 1 if the conditional
stack evaluated to true, 0 if not. This way one can check what rays is logged
using regular McStas monitors. Only works if a conditional is applied to this
logger.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
target_geometry	string	Comma separated list of geometry names that will be logged, leave empty for all volumes (even not defined yet)	"NULL"
yheight	m	height of absorption logger
n	1	number of bins along y	100
filename	string	Filename of produced data file	"NULL"
order_total	1	Only log rays that have scattered n times, -1 for all orders	-1
order_volume	1	Only log rays that have scattered n times in the same geometry, -1 for all orders	-1
logger_conditional_extend_index	1	If a conditional is used with this logger, the result of each conditional calculation can be made available in extend as a array called "logger_conditional_extend", and one would then access logger_conditional_extend[n] if logger_conditional_extend_index is set to n	-1

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

Links

• Source code for Union_abs_logger_1D_space.comp.

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[ Identification | Description | Input parameters | Links ]

Generated on 2024-01-03 11:47:43

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Last Modified: Tuesday, 17-Sep-2024 05:31:15 CEST