Minutes of 9 December 2015 Meeting of Geant4 Technical Forum

Editor: A. Morsch, 10 December 2015

- Starting at 16:10

General Introduction of version 10.2 and prospects
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+ see slides

Highlights of Version 10.2 - non-physics part
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+ see slides

Highlights of Version 10.2 - EM Physics
=======================================
+ see slides
Clarification on slide 9: with WVI multiple scattering model + single and
hadronic elastic scattering the Chi^2 has been reduced by a factor of two.
The most constraining region of the data is at medium thickness. 

Highlights of Version 10.2 - Hadronic Physics
=============================================
+ see slides

Open Requirements
=================
+ see slides

slide 9: Time step precision with 28 significant digits for decay time of
very long-lived isotopes. To be discussed with requestor. Proper numerical
approximation could already solve the problem.

Comment on slide 9: UV reflectivity data at cryogenics temperatures complicated
profiles of reflectivity as functions of angle and wavelength.
There is no experimental data to guide or validate the model.

Reminder: Important request from Mu2e: improved anti-proton production from
proton beam in FTFP_BERT

**** New Requirements
CMS
===
Uses v10.0patch3 in production. 
v10.1 and v10.2 are used in tests. Hadronic response has changed, hence,
validation is needed. No decision yet.


ATLAS
=====
on Bugs and other issues (slide 8):
- G4MultiLevelLocator issue has been solved in v10.2
- Field design issue is being worked on. Tests failed so far.

Makoto: 
Next Meeting will be scheduled in March 2016