| [1337] | 1 |
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| 2 | Geant4 8.2 - patch-01 Release Notes
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| 3 | -----------------------------------
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| 4 |
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| 5 | 23 February 2007
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| 6 |
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| 7 | List of fixes included in this public patch since the public release 8.2:
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| 8 |
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| 9 | o Geometry:
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| 10 | --------
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| 11 | + management:
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| 12 | o Added flag to G4VPhysicalVolume::CheckOverlaps() method for
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| 13 | controlling verbosity. By default, verbosity is ON.
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| 14 | + navigation:
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| 15 | o In G4Navigator, forcing call to CheckOverlaps() on the current
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| 16 | volume before event abortion for cases of stuck tracks.
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| 17 | o G4PropagatorInField: implemented ClearPropagatorState()
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| 18 | to clear track-dependent state (safety, zero-steps, loop flag. etc...).
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| 19 | Call to this method becomes mandatory in G4Transportation for each new
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| 20 | track to overcome side effects of safety inconsistency in presence of
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| 21 | geometry overlaps.
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| 22 | + solids/specific:
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| 23 | o Do not scale reducible-polygon in G4Polyhedra::Reset() method.
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| 24 | The 'original_parameters' structure offered as input through the
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| 25 | accessors are always assumed to be already scaled by the
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| 26 | 'cos(0.5*phiTotal/theNumSide)' factor.
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| 27 | Addresses problem report #873.
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| 28 | o Fix in G4PolyconeSide::DistanceAway() for correct estimation of
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| 29 | distance for the case of Phi sections.
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| 30 | Addresses problem report #598.
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| 31 | + volumes:
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| 32 | o Added flag for controlling verbosity to CheckOverlaps() method for
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| 33 | G4PVPlacement and G4PVParameterised. By default, verbosity is ON.
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| 34 |
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| 35 | o Global:
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| 36 | ------
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| 37 | + Changed date for patch-01 to release 8.2.
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| 38 |
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| 39 | o Electromagnetic processes:
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| 40 | -------------------------
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| 41 | + standard:
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| 42 | o G4UrbanMscModel:
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| 43 | - Fix in the single scattering code for heavy particles, now the code
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| 44 | can be used with skin=1 e+/e- and for heavy particles as well.
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| 45 | - Removed unecessary call to G4Navigator location method.
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| 46 | - Added protection inside lateral displacement sampling against cases
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| 47 | of TrueStepLength < GeomStepLength.
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| 48 | - Added protections against NaN values in two places: sampling of
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| 49 | theta when tau=0 in lateral displacement, and in method
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| 50 | ComputeTrueStepLength() for the case of zero true length.
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| 51 | o G4MultipleScattering: fix to allow for reinitialisation of model
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| 52 | parameters between runs.
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| 53 | o Use SetEmModel(index) and added SetFluctModel() from
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| 54 | G4VEnergyLossProcess in eIonisation, hIonisation, ionIonisation,
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| 55 | eBremstrahlung.
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| 56 | + utils:
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| 57 | o Fixed a problem happening in interactive sessions when activating or
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| 58 | deactivating processes; the problem resulting in building wrong dEdx
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| 59 | tables for e+- and muons. Modified classes are: G4LossTableBuilder,
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| 60 | G4LossTableManager and G4VEmEnergyLossProcess.
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| 61 | New tables are added for e+- and muons ionisation additionally to
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| 62 | total energy loss tables.
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| 63 |
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| 64 | o Hadronic Processes:
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| 65 | ------------------
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| 66 | + models/binary_cascade:
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| 67 | o G4BinaryCascade::Capture(): added protection against division by zero.
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| 68 | + models/chiral_inv_phase_space:
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| 69 | o Fixed cases of division by 0 in G4Quasmon and G4QNucleus.
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| 70 | and other cases of generation of NaN.
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| 71 | Reduces segmentation faults in CHIPS-based models and physics lists
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| 72 | such as QGSC.
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| 73 | o Fixed bug of generation of NaN in G4QElastic observed in complicated
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| 74 | event for the multi-projectile case.
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| 75 | Reduces segmentation faults in elastic scattering.
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| 76 | + models/de_excitation:
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| 77 | o Evaporation: added protection to exclude negative probabilities from
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| 78 | the "competitive channel sum". Together with the fix below for fission
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| 79 | this should only happen due to a precision error, but is protected
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| 80 | nonetheless.
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| 81 | o Fission: fixed probability to no longer be negative. Is now equivalent
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| 82 | to what is written in the Physics Reference Manual.
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| 83 | The above two fixes also affect the precompound model which invokes
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| 84 | these models.
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| 85 | o Fission: fixed several memory leaks in G4ParaFissionModel.
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| 86 | + models/low_energy:
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| 87 | o G4LElastic: added protection against sqrt() of negative value.
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| 88 | + models/management:
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| 89 | o For error reporting, added model name arguments and default names to
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| 90 | constructors for classes G4HadronicInteraction, G4InelasticInteraction,
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| 91 | G4VIntraNuclearTransportModel and G4VPreCompoundModel.
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| 92 | + models/neutron_hp:
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| 93 | o Fixed potential divisions by zero in: G4NeutronHPVector,
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| 94 | G4NeutronHPLevel and G4NeutronHPInterpolator.
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| 95 | + models/parton_string/hadronization:
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| 96 | o G4ExcitedStringDecay::EnergyAndMomentumCorrector(): fixed bug which
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| 97 | did stop correction even if not yet converged; check on convergence
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| 98 | must check that scale-1 is close to 0, and not less than 0.
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| 99 | + models/parton_string/management:
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| 100 | o Debugged method Dump() added in G4InteractionContent to print object.
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| 101 | o Debugged output in G4VPartonStringModel checking E-p conservation of
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| 102 | string model.
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| 103 | The above two points provide improved, more detailed verbose output.
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| 104 | + models/parton_string/qgsm:
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| 105 | o Corrected E-p non-conservation in QGS. In G4QGSMSplitableHadron,
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| 106 | the smaller of the lightcone momenta Q+/Q- was ignored.
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| 107 | o Fixed division by 0 in G4QGSMSplitableHadron::SampleX().
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| 108 | o Added debugging output to several classes.
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| 109 | + models/util:
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| 110 | o Added method to G4Parton for setting momentum using both + and -
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| 111 | momentum component. Should help in improving shower shapes.
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| 112 | o G4Fragment: more info on warning output of negative excitation energy.
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| 113 | + processes:
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| 114 | o Added process names to G4HadronElasticProcess, G4HadronCaptureProcess,
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| 115 | G4HadronFissionProcess. This will allow more detailed error reporting.
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| 116 | o Cleaned up commented-out code.
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| 117 | + stopping:
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| 118 | o G4MuMinusCaptureCascade: added sampling of random vector of e- in
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| 119 | decay; added factor 2 in potential energy - fixing decay spectrum.
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| 120 | o G4MuonMinusCaptureAtRest: fixed problem for the case when isotope
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| 121 | vector is undefined. Force to use round 'targetA'.
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| 122 | Addressing problem report #926.
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| 123 | + util:
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| 124 | o G4HadFinalState: corrected initialisation of energy deposition.
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| 125 | Fix affects elastically scattered neutrons and probably most
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| 126 | hadronic models. Reduces the number of events in which the summed
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| 127 | energy of final particles exceeds that of the incident particle.
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| 128 |
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| 129 | o Materials:
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| 130 | ---------
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| 131 | + G4Material: fill fAtomVector in the case when material is built
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| 132 | from element mass fractions, allowing for low-energy package to
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| 133 | use NIST G4_WATER.
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| 134 | + G4NistMaterialBuilder: added liquids O2 and N2.
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| 135 | + G4NistElementBuilder: added protection for Z<=101.
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| 136 |
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| 137 | o Physics Lists:
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| 138 | -------------
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| 139 | + Fix in QGSP_BIC_HP list: activated use of HP elastic.
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| 140 | + G4HadronElasticPhysics: set limits on low energy and QElastic to zero.
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| 141 | + Fixed special cuts for LBE physics list.
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| 142 | + Added set min/max Energy and Inelastic Energy to NeutronHP builder.
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| 143 | + G4EmStandardPhysics: use G4hMultipleScattering for muons and removed
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| 144 | extra printouts. Use default multiple-scattering setup in
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| 145 | G4EmStandardPhysics72.
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| 146 |
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| 147 | o Run:
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| 148 | ---
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| 149 | + Fix in method G4RunManager::NumberOfEventToBeStored().
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| 150 | Addressing problem report #925.
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| 151 | + Added protection against missing particle types before
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| 152 | BuildPhysicsTable() is invoked. Addressing problem report #923.
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| 153 |
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| 154 | o Transportation:
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| 155 | --------------
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| 156 | + G4Transportation: calling PropagatorInField to clear state for new
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| 157 | track. This addresses a reliabilitiy problem observed by ATLAS; the
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| 158 | fix is related to overlaps in the geometry, and consists in clearing
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| 159 | the safety value, which may become multivalued due to overlaps in the
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| 160 | geometry, and thus can become invalid for a new track in an overlap
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| 161 | region...
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| 162 | + Added protection against zero 'velocity' in method
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| 163 | G4Transportation::AlongStep().
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| 164 |
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| 165 | o Configuration:
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| 166 | -------------
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| 167 | + Updated Configure script to prompt for new version of G4EMLOW data set.
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| 168 |
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| 169 | o Data Sets:
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| 170 | ---------
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| 171 | + New data set G4EMLOW4.2: correction to Auger data.
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| 172 |
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| 173 | o Examples:
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| 174 | --------
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| 175 | + Updated reference outputs.
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| 176 | + advanced/underground_physics
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| 177 | o Removed uninitialized 'UserLimitsForXenon'.
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| 178 | + extended/extended/TestEm7
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| 179 | o Cleanup of macros.
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| 180 | + extended/electromagnetic/TestEm16
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| 181 | o Added HistoManager and HistoMessenger and commands to modify
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| 182 | upper step limit. Minor fix to GNUmakefile.
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| 183 | + extended/radioactivedecay/exrdm
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| 184 | o Fixed usage of physics-lists and histograms
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| 185 | + extended/runAndEvent/RE02
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| 186 | o Fixed missing NULL pointer protection in ComputeMaterial() method.
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| 187 |
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| 188 | ----------------------------------------------------------------------------
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| 189 |
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| 190 | Technical Notes
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| 191 | ---------------
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| 192 |
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| 193 | o This patch should be applied on top of release 8.2
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| 194 | o Technical notes distributed for release 8.2 are also applicable and
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| 195 | valid for this patch.
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| 196 |
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| 197 | The code and rebuilt binary libraries for release 8.2 are available
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| 198 | through our "Source Code" Web page:
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| 199 | http://cern.ch/geant4/support/download.shtml
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| 200 |
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| 201 | Please refer to the Geant4 User Documentation:
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| 202 | http://cern.ch/geant4/support/userdocuments.shtml
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| 203 | for further information about using Geant4.
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