Minutes of 17 January 2018 Meeting of the Geant4 Technical Forum
Editor: A. Morsch, 17 January 2018
- Starting at 16:00

General introduction of version 10.4 and prospects
==================================================
+ see slides for details
+ next release will be end of June 2018 (beta) early December 2018 (final)
+ next TF will be organized March/April 2018 with the 2018 work plan as the main topic


Highlights of version 10.4 - non–physics part
=============================================
+ see slides
+ clarification of slide 4
  New stepper G4DormandPrince457 is now set as default. It is faster (30% less field
  evaluations) and more accurate then the previous default (G4ClassicalRK4)
+ clarification on slide 8
  ZeroMQ is a message queue service used as new backend for UI command distribution
  for use by interactive notebooks environments


Highlights of version 10.4 – EM physics part
============================================
+ see slides
+ slide 8: the possibility to customize EM configuration per detector region is
  available since 10.4 (not 10.3)
+ no plans to provide higher granularity data files for low-energy electromagnetic
  processes since the file is relatively small (4% of the total)


Highlights of version 10.4 – Hadronic physics part
==================================================
+ see slides

Open requirements
=================
+ see slides
+ New requirements from Wollongong radiation physics user workshop now discussed
  in the Collaboration 
+ Progress on several open requirements from radio-protection and radio-physics.
+ 4301: "Need of correct pion elastic model for T2K" requires feedback from requestor
+ 4003: "Tool to understand difference between any two G4 version" is next to completion
+ 4002: "Reweightable uncertainties for syst. uncertainty evaluation" is in progress
+ 3901: "Complete destructions of G4 objects at exit" is close to completion
+ 4401: "Synchronisation of field related objects" is done
+ 4004: "Treatment of gamma cascades after neutron capture", corrected in patch
  10.2.p01, but now feedback from LUX-ZEPLIN
 
**** New Requirements

ALICE report
============
+ see slides 
+ Geant4 used for general purpose productions and considered for upcoming QM2018 special
  productions
+ difference to data seen in TOF beta distribution not solved by use of HP option


Validation of VecGeom for CMS simulation
========================================
+ see slides

Status and plans for CMS simulation
===================================
+ see slides
+ on the long term, to meet the HL LHC challenges, CMS wants to speed up simulation
  by a factor of 10


ATLAS Report
============
+ see slides
+ slide 10
  Simulation of hadronic interactions of particles with pre-determined decays will
  be facilitated by planned interfacing with EPOS.


CCFE Contributions
==================
+ see slides
+ The proposed contributions to geometry, nuclear data and high performance computing
  are received very positively. 
+ Further discussions are needed to specify the details. John Allison, the Geant4 UK
  contact will get in touch with CCFE.