FairShip installation
The first and most troublesome step of every study
Software build with aliBuild
Local installation
Currently used SHiPBuild software (12th Collaboration Meeting).
After installation, to redo build (local modification, global updates, ...):
> cd SHIPBuild > FairShip/aliBuild.sh
Set environment variables with the command
>alibuild/alienv enter --shellrc FairShip/latest
Lxplus installation (or anywhere else accessing CVFMS)
The computing group name on lxplus is ship-cg. It can be set from the CERN resource page.
For 2020 configuration:
Source the environment from CVMFS
2. Do your installation with aliBuild
For 2018 configuration:
Source the environment from CVMFS
2. Do your installation with aliBuild
Entering the environment
3. Use your new installation
On HTCondor use
The source at 1. must be done everytime we enter a new lxplus session!
Do not mess up the two configurations! We need to exit the enviroment and re-enter if we want to move from 2018 to 2020 configurations (or vice-versa)
Run FairShip simulation
Standard run_simScript.py simulation, with --Genie option and no options about the detector. Usage:
python $FairShip/macro/run_simScript.py --Genie -f genie_nu.root -n nevents -o outputfile.
Important: we have to provide Genie with the positions where we want to generate these neutrinos. Look for
Geniegen.SetPositions()
usually we want to set it from the start to the end of the neutrino target.
Using c++ macros
(Updated: This can be avoided by using TTreeReader and removing the include lines, thanks to cling (clang?) compiling and loading the shared libraries itself)
root -l
>>#include "FairMCPoint.h"
>>#include "TMCProcess.h
>>.x mymacro()
Checking geometry output
Event display can be launched in the following way:
python -i $FAIRSHIP/macro/eventDisplay.py -f simulationfile.root -g geofile.root
(actual names of simulationfile.root and geofile.root depend on the launched simulation)
Event display is slow, for quick checks it may be more useful to display single volumes directly with ROOT GL (as from `https://github.com/antonioiuliano2/macros-ship/blob/master/drawrootvolume.py`)
Positions and dimensions of volumes can be checked in the following way: python $FAIRSHIP/macro/getGeoInformation.py -g geofile.root
Useful options:
-v: name of the volume to expand (see list of volume daughters)-l: 'depth' level of the subnode expansion (how many daughters are showed)
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