G4 Workshop 2002 Det ect or Descript ion Parallel Session Radovan - - PowerPoint PPT Presentation

▶

Feb 04, 2023 159 likes •223 views

G4 Workshop 2002 Det ect or Descript ion Parallel Session Radovan Chytracek CERN I T/ API Geant4 Agenda Geometry & materials input XML GUI Editors G4 binding to detector description subsystems of experiment f rameworks

SLIDE 1

G4 Workshop 2002 Det ect or Descript ion Parallel Session

Radovan Chytracek CERN I T/ API Geant4

SLIDE 2

2 Oct ober 2002 Radovan Chyt racek CERN I T/ AP I Geant 4 2

Agenda

Geometry & materials input

– XML – GUI Editors

G4 binding to detector description subsystems of experiment f rameworks

– I ssues – Problems – Solutions

New requirements to marry detector description & G4

SLIDE 3

2 Oct ober 2002 Radovan Chyt racek CERN I T/ AP I Geant 4 3

Geomet ry & Mat erials

Current state of XML based solutions

– G4 provides GDML – Experiments have many others

Gaudi DDDB, CMS DDD, ATLAS & GLAST AGDD, …

Agreement to f reeze the new developments f or XML based solutions and to wait f or outcome of Detector Description RTAG # 7 in the context of LCG I t’s clear that common exchange f ormat is really needed in the area of detector description G4 GDMLWriter is needed in the short time scale

– Possible re- use of CMS XML streamer implementation

SLIDE 4

2 Oct ober 2002 Radovan Chyt racek CERN I T/ AP I Geant 4 4

GUI Edit ors

G4 provides Momo (GGE UI module)

– Using its own persistent f ormat – Not clear how many users of it exist

Evgueni Tcherniaev’s GBuilder

– Data in the f orm of dynamically built & loaded C++ code – Good will to generate G4 f riendly C++ geometry code or to provide import/ export module (see requirements later)

Gaudi Java XML editor

– Quite f lexible, can understand new XML DTDs and Schemas – Can be very usef ul when common exchange f ormat exists

GraXML

– I ndependent Java based visualization – Understands HEP XML dialects, even GDML Beta version – Good will to adopt the new common exchange f ormat if available

SLIDE 5

2 Oct ober 2002 Radovan Chyt racek CERN I T/ AP I Geant 4 5

G4 Binding

I ssues

– Lack of (re- )usable I / O machinery

Dump of solids’ parameters, …

– Experiments have f ound their way to integrate G4 already

Mostly re- implementing steering & event loop part of G4

Problems

– Migration problems f rom G3 to G4

G4Exception due to precision problems
Not happy with the def ault exception “terminate”

behavior

Not clear whether multiple or user def ined exception

handlers possible with the new G4 exception mechanism

SLIDE 6

2 Oct ober 2002 Radovan Chyt racek CERN I T/ AP I Geant 4 6

New Requirement s

Medium

Might be thin, but well def ined & documented, f irst client of it is GBuilder tool I / O I nterf ace f or external import/ export tools

Priority Description Requirement Medium

Switch- of f transf ormation matrix consistency check & let the user “correct” the matrix bef ore use in G4 Migration: g3tog4 option

High

Switch- of f generating of names f or the objects created by the f actory G4Ref lexionFactory

ption