Difference between revisions of "Input syntax manual"
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*Using the nps card sets the mode to external source simulation. Criticality source simulation for neutrons is invoked using [[#set pop|set pop]]. | *Using the nps card sets the mode to external source simulation. Criticality source simulation for neutrons is invoked using [[#set pop|set pop]]. | ||
*Running an external source simulation requires a source, defined by the [[#src|src card]]. Source definition also sets the transported particle type. | *Running an external source simulation requires a source, defined by the [[#src|src card]]. Source definition also sets the transported particle type. | ||
| − | *Neutron external source simulations are limited to sub-critical systems, unless time cut-off ([[#set tcut|set tcut]]) | + | *Neutron external source simulations are limited to sub-critical systems, unless time cut-off ([[#set tcut|set tcut]]) or generation cut-off ([[#set gcut|set gcut]]) is invoked |
| + | *Neutron external source simulations in multiplying systems may require adjusting the neutron buffer ([[#set nbuf|set nbuf]]) | ||
=== set nps === | === set nps === | ||
Revision as of 17:52, 17 November 2015
Contents
Preface
This page will contain the whole input syntax of Serpent 2
This is a reference to one article [1]
This is another reference to the same article [1]
Input cards
mat (material definition)
surf (surface definition)
cell (cell definition)
det (detector definition)
src
Input options
set pop
set pop <npg> <ngen> <nskip> [ <keff0> <btch> ]
Sets parameters for simulated neutron population in criticality source mode. Input values:
| <npg> | number of neutrons per generation |
| <ncyc> | number of active generations |
| <nskip> | number of inactive generations |
| <keff0> | initial guess for k-eff |
| <btch> | batching interval |
The simulation is first run for a number of inactive generations to allow the fission source to converge. This is followed by a number of active generations, during which the results are collected. The statistics are divided in batches, and by default each generation forms its own batch.
Notes:
- Using the pop card sets the mode to criticality source simulation. External source simulation is invoked using set nps.
- Convergence of fission source can be monitored using Shannon entropy (input parameters set his and set entr).
- See detailed description on the statistical effects of batching.
set nps
set nps <ppb> [ <btch> ]
Sets parameters for simulated particle population in external source mode. Input values:
| <ppb> | number of particles per batch |
| <btch> | number of batches |
The simulation is for a number batches using the given batch size.
Notes:
- Using the nps card sets the mode to external source simulation. Criticality source simulation for neutrons is invoked using set pop.
- Running an external source simulation requires a source, defined by the src card. Source definition also sets the transported particle type.
- Neutron external source simulations are limited to sub-critical systems, unless time cut-off (set tcut) or generation cut-off (set gcut) is invoked
- Neutron external source simulations in multiplying systems may require adjusting the neutron buffer (set nbuf)
set nps
set nps <npg> [<keff0> <>]
Setting the neutron population.
| <npg> | neutrons_per_generation |
| <nc> | neutrons |
set delnu
set roulette
References
- ^ Leppänen, J. "Development of a new Monte Carlo reactor physics code." D.Sc. Thesis, Helsinki University of Technology, 2007. (VTT Publications 640)
