Difference: GENIE (10 vs. 11)

Revision 112021-04-20 - WilliamSeligman

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META TOPICPARENT	name="WilliamSeligman"

Running GENIE at Nevis

To run the GENIE Neutrino Monte Carlo at Nevis, you can take one of two approaches:

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Access the version maintained at Fermilab.

Use a software suite (GENIE and its external packages) installed at Nevis by WilliamSeligman.

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Access the version maintained at Fermilab.

I recommend against trying to install it on your laptop or in your own work area on the cluster; GENIE requires quite a few external packages, is finicky about those packages' versions, and the complete build/installation process has a number of pitfalls. Even the supposedly pre-configured lamp scripts, which are supposed to install all of GENIE's dependencies for you, do not work reliably.

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What's next?

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The output of gevgen and related applications is a ROOT file that can only be conveniently read using another GENIE application. To convert that output file into a form that can be read by a non-GENIE program, you probably want to use gntpc. In this example, the output will be a "gtrac" file that can be read using ROOT without involving GENIE load libraries:

gntpc -i gntp.inuke.0.ghep.root -f rootracker

gntpc is described on page 147 of the manual.

As described in the GENIE manual, to turn various models on/off you need to generate new spline files. The program for doing that is gmkspl, described on page 103 of the manual. You'll want to copy the directory $GENIE/config/ to your work area, then copy and edit file EventGeneratorListAssembler.xml; that revised file will become an input list to gmkspl. An possible example (ν_μ on Ar⁴⁰, up to 10 GeV):

gmkspl -p 14 -t 1000180400 -e 10 \

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--output-cross-sections my-splines.xml

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> Note that gmkspl typically takes several hours to run. You may want to learn about the tmux command for interactive sessions that won't be killed if your connection is lost.

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