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