1. 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

2. 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

3. 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

4. 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)

5. 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

6. 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

7. 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

8. 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

9. 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