[ Identification | Description | Input parameters | Links ]

The MCPL_input_once Component

Source-like component that reads neutron state parameters from a MCPL-file one time.

Identification

• Author: Gregory S Tucker
• Origin: European Spallation Source ERIC
• Date: Sep 2024, reduced to an INHERIT of MCPL_input Oct 2026

Description

Source-like component that reads neutron state parameters from a MCPL-file one time.

Since Oct 2026 MCPL_input_once is MCPL_input with repeat_count=1 (and the default
replicate_across_processes=0) forced: the file is shared between MPI processes and
every event in the file is used exactly once. The parameters are inherited from
MCPL_input; repeat_count and replicate_across_processes are ignored.
See MCPL_input for the full documentation.

MCPL is short for Monte Carlo Particle List, and is a format for sharing events
between e.g. MCNP(X), Geant4 and McStas.

When used with MPI, the file contents are shared between workers with each accessing
approximately (#events in the file) / (#MPI nodes)

Example: MCPL_input_once(filename=voutput,v_smear=0.1,pos_smear=0.001,dir_smear=0.01)

Input parameters

Parameters in boldface are required; the others are optional.

Name

Unit

Description

Default

AT (	,	,		) RELATIVE		Generate to clipboard
ROTATED (	,	,		) RELATIVE

Links

• Source code for MCPL_input_once.comp.

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

Generated on mcstas 3.10.0

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Last Modified: Friday, 23-Oct-2026 18:32:09 CEST