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Version: SMASH-2.2
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Version: SMASH-2.2
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#include <experimentparameters.h>
Helper structure for Experiment.
Experiment has one member of this struct. In essence the members of this struct are members of Experiment, but combined in one structure for easier function argument passing.
Definition at line 24 of file experimentparameters.h.
Public Attributes | |
| std::unique_ptr< Clock > | labclock |
| System clock (for simulation time keeping in the computational frame) More... | |
| std::unique_ptr< Clock > | outputclock |
| Output clock to keep track of the next output time. More... | |
| int | n_ensembles |
| Number of parallel ensembles. More... | |
| int | testparticles |
| Number of test-particles. More... | |
| DerivativesMode | derivatives_mode |
| mode of calculating gradients for density calculation More... | |
| RestFrameDensityDerivativesMode | rho_derivatives_mode |
| mode of calculating rest frame density gradients (on or off) More... | |
| FieldDerivativesMode | field_derivatives_mode |
| mode of calculating field derivatives More... | |
| const SmearingMode | smearing_mode |
| mode of smearing for density calculation More... | |
| double | gaussian_sigma |
| Width of gaussian Wigner density of particles. More... | |
| double | gauss_cutoff_in_sigma |
| Distance at which gaussian is cut, i.e. set to zero, IN SIGMA (not fm) More... | |
| double | discrete_weight |
| Weight applied to the center cell in the discrete smearing. More... | |
| double | triangular_range |
| Range of lattice nodes, in units of lattice spacing, that the triangular smearing uses. More... | |
| const CollisionCriterion | coll_crit |
| Employed collision criterion. More... | |
| bool | two_to_one |
| This indicates whether two to one reactions are switched on. More... | |
| const ReactionsBitSet | included_2to2 |
| This indicates which two to two reactions are switched off. More... | |
| const MultiParticleReactionsBitSet | included_multi |
| This indicates which multi-particle reactions are switched on. More... | |
| bool | strings_switch |
| This indicates whether string fragmentation is switched on. More... | |
| bool | use_AQM |
| Whether to use the AQM or not. More... | |
| double | res_lifetime_factor |
| Multiplicative factor to be applied to resonance lifetimes; in the case of thermal multiplicities this should also be applied to initial multiplicities of resonances, so that one does not artificially introduce a non-zero pion chemical potential. More... | |
| bool | strings_with_probability |
| This indicates whether the string fragmentation is swiched on with a probability smoothly increasing with energy. More... | |
| NNbarTreatment | nnbar_treatment |
| This indicates how NN̅ annihilation should be treated; options are to neglect it, make it conserve detailed balance using NN̅ → h₁(1170)ρ (which goes to 5 pions on average) or use strings. More... | |
| double | low_snn_cut |
| Elastic collisions between the nucleons with the square root s below low_snn_cut are excluded. More... | |
| bool | potential_affect_threshold |
| This indicates whether the mean field potentials affect the scattering or decaying processes by shifting the threshold energies. More... | |
| double | box_length |
| Length of the box in fm in case of box modus, otherwise -1. More... | |
| double | maximum_cross_section |
| The maximal cross section (in mb) for which it is guaranteed that all collisions with this cross section will be found. More... | |
| double | fixed_min_cell_length |
| Fixed minimal grid cell length (in fm). More... | |
| bool | allow_collisions_within_nucleus |
| Allow or forbid the first collisions within the same nucleus. More... | |
| double | scale_xs |
| Global factor which all cross sections are scaled with. More... | |
| double | additional_el_xs |
| Additional constant contribution (in mb) to the elastic cross sections. More... | |
| bool | only_participants |
| In thermodynamics outputs, it decides whether to use only participants (true) or also spectators (false, default value). More... | |
| bool | do_weak_decays |
| Do weak decays at the end. More... | |
| std::unique_ptr<Clock> smash::ExperimentParameters::labclock |
System clock (for simulation time keeping in the computational frame)
Definition at line 26 of file experimentparameters.h.
| std::unique_ptr<Clock> smash::ExperimentParameters::outputclock |
Output clock to keep track of the next output time.
Definition at line 29 of file experimentparameters.h.
| int smash::ExperimentParameters::n_ensembles |
Number of parallel ensembles.
Definition at line 32 of file experimentparameters.h.
| int smash::ExperimentParameters::testparticles |
Number of test-particles.
Definition at line 35 of file experimentparameters.h.
| DerivativesMode smash::ExperimentParameters::derivatives_mode |
mode of calculating gradients for density calculation
Definition at line 38 of file experimentparameters.h.
| RestFrameDensityDerivativesMode smash::ExperimentParameters::rho_derivatives_mode |
mode of calculating rest frame density gradients (on or off)
Definition at line 40 of file experimentparameters.h.
| FieldDerivativesMode smash::ExperimentParameters::field_derivatives_mode |
mode of calculating field derivatives
Definition at line 42 of file experimentparameters.h.
| const SmearingMode smash::ExperimentParameters::smearing_mode |
mode of smearing for density calculation
Definition at line 45 of file experimentparameters.h.
| double smash::ExperimentParameters::gaussian_sigma |
Width of gaussian Wigner density of particles.
Definition at line 48 of file experimentparameters.h.
| double smash::ExperimentParameters::gauss_cutoff_in_sigma |
Distance at which gaussian is cut, i.e. set to zero, IN SIGMA (not fm)
Definition at line 51 of file experimentparameters.h.
| double smash::ExperimentParameters::discrete_weight |
Weight applied to the center cell in the discrete smearing.
Definition at line 54 of file experimentparameters.h.
| double smash::ExperimentParameters::triangular_range |
Range of lattice nodes, in units of lattice spacing, that the triangular smearing uses.
Definition at line 58 of file experimentparameters.h.
| const CollisionCriterion smash::ExperimentParameters::coll_crit |
Employed collision criterion.
Definition at line 61 of file experimentparameters.h.
| bool smash::ExperimentParameters::two_to_one |
This indicates whether two to one reactions are switched on.
Definition at line 64 of file experimentparameters.h.
| const ReactionsBitSet smash::ExperimentParameters::included_2to2 |
This indicates which two to two reactions are switched off.
Definition at line 67 of file experimentparameters.h.
| const MultiParticleReactionsBitSet smash::ExperimentParameters::included_multi |
This indicates which multi-particle reactions are switched on.
Definition at line 70 of file experimentparameters.h.
| bool smash::ExperimentParameters::strings_switch |
This indicates whether string fragmentation is switched on.
Definition at line 73 of file experimentparameters.h.
| bool smash::ExperimentParameters::use_AQM |
Whether to use the AQM or not.
Definition at line 76 of file experimentparameters.h.
| double smash::ExperimentParameters::res_lifetime_factor |
Multiplicative factor to be applied to resonance lifetimes; in the case of thermal multiplicities this should also be applied to initial multiplicities of resonances, so that one does not artificially introduce a non-zero pion chemical potential.
Definition at line 84 of file experimentparameters.h.
| bool smash::ExperimentParameters::strings_with_probability |
This indicates whether the string fragmentation is swiched on with a probability smoothly increasing with energy.
If it's set equal to false, the cross section of the string fragmentation is counted by taking the difference between the parametrized total cross section and the sum of the non-string cross sections.
Definition at line 93 of file experimentparameters.h.
| NNbarTreatment smash::ExperimentParameters::nnbar_treatment |
This indicates how NN̅ annihilation should be treated; options are to neglect it, make it conserve detailed balance using NN̅ → h₁(1170)ρ (which goes to 5 pions on average) or use strings.
Definition at line 99 of file experimentparameters.h.
| double smash::ExperimentParameters::low_snn_cut |
Elastic collisions between the nucleons with the square root s below low_snn_cut are excluded.
Definition at line 105 of file experimentparameters.h.
| bool smash::ExperimentParameters::potential_affect_threshold |
This indicates whether the mean field potentials affect the scattering or decaying processes by shifting the threshold energies.
Definition at line 111 of file experimentparameters.h.
| double smash::ExperimentParameters::box_length |
Length of the box in fm in case of box modus, otherwise -1.
Definition at line 116 of file experimentparameters.h.
| double smash::ExperimentParameters::maximum_cross_section |
The maximal cross section (in mb) for which it is guaranteed that all collisions with this cross section will be found.
This means that all particle pairs, where the transverse distance is smaller or equal to \( \sqrt{\sigma_{max}/\pi} \), will be checked for collions.
The maximal cross section is also scaled with the cross section scaling factor.
Definition at line 129 of file experimentparameters.h.
| double smash::ExperimentParameters::fixed_min_cell_length |
Fixed minimal grid cell length (in fm).
Only used and useful in case of the stochastic criterion, where the grid cell size is calculation parameter. Only particles within the cells are checked for collisions. The cell length is not scaled by the number of test-particles.
Default of 2.5 fm produces (without test-particles) equivalent-sized grid as the maximum cross section default of 200 fm.
In case of the geometric criteria, the cell size is determined by the maximum cross section.
Definition at line 143 of file experimentparameters.h.
| bool smash::ExperimentParameters::allow_collisions_within_nucleus |
Allow or forbid the first collisions within the same nucleus.
Definition at line 146 of file experimentparameters.h.
| double smash::ExperimentParameters::scale_xs |
Global factor which all cross sections are scaled with.
Using it will break agreement with experimental data for cross sections that are constrained with data.
Definition at line 153 of file experimentparameters.h.
| double smash::ExperimentParameters::additional_el_xs |
Additional constant contribution (in mb) to the elastic cross sections.
Using it will break agreement with experimental data for elastic cross sections that are constrained with data.
Definition at line 161 of file experimentparameters.h.
| bool smash::ExperimentParameters::only_participants |
In thermodynamics outputs, it decides whether to use only participants (true) or also spectators (false, default value).
Definition at line 166 of file experimentparameters.h.
| bool smash::ExperimentParameters::do_weak_decays |
Do weak decays at the end.
Definition at line 169 of file experimentparameters.h.