Jan. 2013Oct. 2013
Total estimated non-SBIR usage40 FTE-years57 FTE-years
Average time using G4beamline3.1 years2.1 years

Estimating an FTE-year to cost $200k, this represents at least $11 Million in investment by the G4beamline user community. This is an underestimate. The decrease in the second row shows the user community is growing.

As can be expected, all of the current, upcoming, or proposed muon experiments are represented: Mu2E, Muon
g-2, MICE, MEG, PRISM/PRIME, COMET, MuSiC, MUTON. Neutrino experiments and proposals are also well represented, as is the Muon Accelerator Program at Fermilab. There are many other users: the Fermilab test beam, several hadronic experiments, muon spin resonance, proton radiography, radiation detector at the International Space Station, the “accelerator on a chip” team, the ILC, and lots more. Most of the major particle physics laboratories are included: FNAL, BNL, JLab, SLAC, CERN, RAL, PSI, TRIUMF, KEK, INFN, LANL, JPARC. Unsurprisingly, Muons, Inc. was the largest single user of G4beamline, followed by MAP, Mu2E, and MICE. G4beamline was cited as essential for three masters theses and two Ph.D. theses.

Some interesting quotes:
• "G4beamline is an absolutely central part of our software suite. The standard GEANT4 tools and our framework are unwieldy for making estimates and getting rough answers for refinement, and without G4Bl we would be lost." — Bob Bernstein (co-spokesperson, Mu2E)
• "Given how difficult other software is to use, G4Beamline probably saved me a factor of 2 or more in time to get the information we needed for our research." — Tom Schwarz (U. Michigan)
• "After using G4BL for more than 2 years it remains my favourite simulation program, even though I have learnt others as well. I prefer G4BL because it is very easy to use and it is easy to debug the files." — Ole Hansen (CERN)
• "The simple command language interface has made it possible for undergraduates to use it without much training in GEANT4. It is a very useful tool and may be the best available for exploring beam lines and backgrounds. Amazed as to how easy it was to get something working." — Lucien Cremaldi (U. Mississippi)
• "Nice handy tool. To do the problems I am working on would be almost impossible without the aid of such a package." — Doug Jensen (FNAL)
• "This is the first time that such a comprehensive and powerful simulation toolkit (Geant4) has been adapted and streamlined for the use of accelerator physicists, and I think it points the way to the future of simulation studies in our field." — Frederick Jones (TRIUMF)
• "There are certain problems where G4beamline is not only convenient but often the only well-established tool." — Vasiliy Morozov (JLab)
• "Our group has had great response to improvements we have suggested so far." - Mary Convery (Muon g-2)
• "G4beamline is open source and organized in such a way that it can be straightforwardly extended by even not a very experienced code developer." — Vasiliy Morozov (JLab)
• “G4Beamline is amazingly easy to use. For years I have avoided GEANT4 (although I used GEANT3 back in the day)- always putting it off, thinking it’s so much effort.” – Paul Rubinoff
• “G4beamline is quite user-friendly, very easy to use.” – Akira Sato
• “Great product, great support” – Milorad Popovic
• "I like the way it "just works" - no complicated installation, no mucking about with awkward input formats, easy to set up a lattice and run a beam through." — Chris Rogers (RAL)