Set double for number of primary particles

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…