No…i create a file each time because I wrote
/analysis/setFileName myrun1
/run/beamOn 100
/analysis/setFileName myrun2
/run/beamOn 100
/analysis/setFileName myrun3
/run/beamOn 100
following this @ivana’s message B1 write out from multiple events - #2 by psaxioti
if I don’t write /analysis/setFileName myrun1, /analysis/setFileName myrun2, /analysis/setFileName myrun3
the simulation overwrite the root file each time…