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

The Virtual_output Component

Detector-like component that writes neutron state parameters into a 'virtual source' neutron file.

Identification

• Author: E. Farhi
• Origin: ILL
• Date: Dec 17th, 2002
• Version: 1.18
• Modification history:
  • E. Farhi, Dec 17th, 2002: based on Vitess_output and Monitor_nD lib.

Description

Detector-like component writing neutron state parameters to a
virtual source neutron file. The component geometry is the full
plane, and saves the neutron state as it exits from the previous
component.

  It is particularly useful to generate a virtual source at a point that few
neutron reach. A long simulation will then only be performed once, to create
the upstream 'source' file. Further simulations are much faster if they start
from this low flux position with the 'source' file.

Possible file formats are:
1-text column formatted with lines containing 11 values in the order:
      p x y z vx vy vz t sx sy sz stored into about 83 bytes/n.
2-float/double binary files (with the 11 values 'p x y z vx vy vz t sx sy sz')
      stored into 44 and 88 bytes/n respectively for float/double.

Beware the size of generated files ! When saving all events (bufsize=0) the
required memory has been optimized and remains very small. On the other hand
using large bufsize values (not recommended) requires huge storage memory.
Moreover, using the 'bufsize' parameter will often lead to wrong intentities.
Both methods will generate huge files.

A Vitess file may be obtained from the 'Vitess_output' component or from a
Vitess simulation (104 bytes per neutron) and read with Vitess_input.

%BUGS
We recommend not to use parallel execution (MPI/Threads) with this component.

Example: Virtual_output(file="MySource.dat")
  will generate a 9 Mo text file for 1e5 events stored.

%BUGS
Using bufsize non-zero generates a virtual source with wrong intensity

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
file	str	Filename of neutron file to write. Default is standard output [string]. If not given, a unique name will be used.	0
type	str	Type of output file 'text','float','double' default is text	0
bufsize	1	Size of neutron output buffer default is 0, i.e. save all - recommended.	0

Output parameters

Name	Unit	Description	Default
DEFS
Vars
mcformat_sim
mcformat_vo
mcformat_override

Links

• Source code for Virtual_output.comp.

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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Sat Jul 31 08:37:33 2010

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Last Modified: Saturday, 31-Jul-2010 10:37:33 CEST