Participants AH - Alex Howard TA - Tsukasa Aso MA - Makoto Asai HK - Hisaya Kurashige JT - Jane Tinslay GC - Gabriele Cosmo PA - Pedro Arce JAl - John Allison JAp - John Apostolakis MV - Marc Verderi TK - Tatsumi Koi VI - Vladimir Ivancenko FL - Fan Lei

Work Plan/Summary I By 25th May 2007… Class clean-up – biasing and scoring… What to remove? (for v9.0) Biasing VScorer and associated classes (in transportation and geometry/biasing) - AH Dedicated Importance biasing Parallel Navigation (in transportation) - AH Independent treatment of parallel and mass worlds (in transportation and geometry/biasing) - AH Examples/extended/B03 – AH MARS – MA, TK, HK MA - notice to hadronics WG What to add? Migrate B01 and B02 (for v9.0) - AH AH - warn VI not to make any change in multiple scattering De-pythonize and migrate (for v9.0) Tiara - AH Scoring 1-D, 2-D contour: accumulated hits in a scorer displayed at the end of the run – TA, MA, JT TA, MA - create a prototype by the end of this week and send it to JT

Work Plan II Directory structures and dependencies Create processes/biasing (MV and MA) Clean /processes/scoring directory (AH) Create /processes/biasing (AH) Move Importance/weight window biasing here from scoring (AH) Biasing function wrapper for physics or generic should sit here in future (AH, JT, MA) Generic biasing process framework access to list of physics (processes EM, hadronic interaction or model (e.g. neutron_hp)) and geometry of significance (G4GeometryCell) Wrap the function to get combined GPIL (all physics processes) Relevant to Importance Biasing and Physics Biasing (cross-section towards a point, interaction length biasing) Work through a couple of examples to test feasibility (All) Before September Collab. Meeting

Workplan III - general Review and update Importance Biasing documentation – ALL (MV - coordinate) Maintain a list of what we have / don’t have, track each item along with decision/progress (JT, MV, MA) Create/update/collect biasing documentation for all biasing techniques we decide to have - ALL (MV - coordinate) Produce examples to validate/verify biasing – CPU performance, statistically consistent, test against experimental data - ALL (MV - coordinate)

Work Plan IIIa – Geometrical Biasing Point tally/detector (SLAC expressed interest, PA, MA, TK) Can only work for tabulated cross-section  neutron_tk (for now) (TK) MA - communicate with PA, developers of new LEP to design point scoring (shooting “pointino”) DXTRAN (for the future, after point scoring, MA) Image projection/pin-hole (for the future once we do understand it, we shall discuss again) Related would be cross-section towards a point or a direction – see physics biasing (JT) Produce a validation example – TIARA data? (AH) TK, MA re-try to find TIARA contacts AH research for another tests

Work Plan IIIb – Physics biasing General framework (slide 2) for accessing and modifying the required information, then associated algorithms produced for: Bremsstrahlung Splitting - JT Implicit capture - JT Leading particle biasing - JT Interaction forcing - JT Path length biasing - JT Cross-section biasing - JT JT, HK, MA work for prototypes

Work Plan IIIc - Scoring Increase the modifiers - TA First, clarify the concept of modifier. Then provide examples. New scorers for residual nuclei – TA, MA Document for hadronic elastic process New scorers with physics table (DPA) – TA, MA, TK, HK We need ENDF atomic data / code Wait to LLNL for their alternative 1-D, 2-D contour – TA, MA, JT, JAl New implementation of G4THitsMap Currently each hit map has a map between copy number and physics quantity – unnecessary duplication – memory waste – TA, MA Reaction rate by process counter – TA

Review of Monte Carlo All-Particle Transport Codes and .. Tallies MCNPX GEANT4 FLUKA MARS PHITS Standard Flux Volume Surface Point/ring Current Charge Kinetic energy Particle density Reaction rates Energy dep. Rapidity DPA Momentum Pulse-height Termination Modifiers Yes No Some Partial 10 ?? User input 3 Star (inelastic) 2 Yes (neutrons) Yes. Special Mesh Coincidence Residuals Event logs rec, cyl, sph Arbitrary (USER) rec, cyl rec,cyl Convergence Tests Error >11 >1 Review of Monte Carlo All-Particle Transport Codes and .. G. W. McKinney (Los Alamos National Laboratory) et al, FNDA 2006, Cape Town, South Africa, April 3-6, 2006

MCNPX GEANT4 FLUKA MARS PHITS Tallies MCNPX GEANT4 FLUKA MARS PHITS Viewer Built-in: 1-D, 2-D Contour External: IDL Tecplot GNUplot PAW No Everything ROOT Custom Angel Variance Reduction Population control Region biasing Weight cutoff Weight window mesh Energy biasing Yes Modified sampling Source biasing Implicit capture Exp. transform Production biasing Yes (GPS) DXTRAN 2-D contour