# Difference between revisions of "Input syntax manual"

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(→set pop) |
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<strong>Notes:</strong> | <strong>Notes:</strong> | ||

− | *Using the pop card sets the mode to criticality source simulation. External source simulation is invoked using [[# | + | *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]]). | *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. | *See [[detailed description]] on the statistical effects of batching. |

## Revision as of 17:37, 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 <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)