V. Daniel Elvira

1
Geant4 at Fermilab
Geant4 is a toolkit for the simulation of the
passage of particles through matter. (
Collaboration of more than 100 physicists
computing professionals CERN, SLAC,,
universities )
Fermilab fragmented, isolated although
significant contributions
to validation, support, development, usage
No Continuity, no plan,
little man-power

• Fermilab is not a G4 member (conditions 2 FTE,
  development maintenance of a piece of code)
• Geant4 suffering from birth child behavior
  problems
• Little interest from the local users community

Geant4 web page at Fermilab www-cpd.fnal.gov/gea
nt4 Latest Geant4 version always available to
users (ups/upd) Close relationship with Geant4
principals
2
CMS
Hcal test beam

• OSCAR librarian (H. Wenzel -support)
  Retired

eCal
HO
Beam Line

• Hcal test beam simulation OSCAR validation
  (V. Daniel Elvira -usage/support /validation)
  June 03

HB
HO
100 GeV pion
Miniboone
beam line (P. Spentzouris usage/support)
CDF
geometry would inherit from G4 classes to allow
use of the nice visualization tools (L. Sexton-K
overlooking usage/support)
Abandoned

BTeV
test beam implementation, time performance test
documented in two BTeV notes (J. Yarba, P.
Lebrun, D. Morozov -usage/ validation/support)
Migration from G3 postponed (time/physics
performance)
3
Neutrino Source/Muon Collider/MICE
Visualization

Coolling Cell
Integration of the OpenInventor package to G4,
driver (J.Kallenbach development/ support)
Retired
Beam Tools
OO design of a set of classes to model
accelerator problems, n source targeted by
extensible ( D. Elvira, P. Lebrun, P.Spentzouris
-development/usage/valid
ation support)
Time dependent electric fields added to Geant4
libraries, classes to construct magnets, r.f.
cavities, absorbers, r.f. tuning mechanism,
interface to Root cooling simulations,
bunching, phase rotation
4
Publications n source feasibility study, gt5
conference proceedings, user manual (Fermi-pubs),
many experiment internal notes, article to JCP
(in preparation)
Minimal Support (MICE may help in further
development
mantainance)
Future
Geant4 is a young adult time to setup a
local collaborative group (Fermilabusers) with
critical mass for

• Providing expertise
• Support ?
• Development ?

Initially centered around CMS expanding as the
Fermilab program becomes more clear i.e. request
from LCG for participation in a G4 fast shower
parameterization project
Join the Geant4 Collaboration (rules more
flexible now) ? Organize users
meeting/tutorials by 2004 ?