3.7  The Adapt_check McStas Component

Optimization specifier for the Source_adapt component.

Identification

• Author: Kristian Nielsen

• Origin: Risoe

• Date: 1999

Description

This components works together with the Source_adapt component, and is used to define the criteria for selecting which neutrons are considered "good" in the adaptive algorithm. The name of the associated Source_adapt component in the instrument definition is given as parameter. The component is special in that its position does not matter; all neutrons that have not been absorbed prior to the component are considered "good".

Example: Adapt_check(source_comp="MySource")

Input parameters

Parameters in boldface are required; the others are optional.

Links

• Component source code found in file Adapt_check.comp.

The adaptive importance sampling monitor

The component Adapt_check is used together with the Source_adapt component - see section 3.6 for details. When placed somewhere in an instrument using Source_adapt as a source, the source will optimize for neutrons that reach that point without being absorbed (regardless of neutron position, divergence, wavelength, etc).

The Adapt_check component takes as single input parameter source_comp the name of the Source_adapt component instance, for example:

1... 
2COMPONENT mysource = Source_adapt(...) 
3... 
4COMPONENT mycheck = Adapt_check(source_comp = mysource) 
5...

Only one instance of Adapt_check is allowed in an instrument.

We suggest, as alternative method, to make use of the SPLIT keyword, as described in the McStas User Manual.