Those questions might sound simple but I consider myself a beginner so please cope with me.
I have been using example TestEM11 for energy deposition profile (histogram 1) of ions.
Recently, I have been interested in understanding the fluctuation of those profiles between same run of particles.
I thought first that the error bars when running 10^4 particles was due to this fluctuation but then I tried to run only one particle and see fluctuation between runs. The error bars on 1 particle are so huge that I doubt it is due to physical parameters. (running run01.mac with protons 1MeV should show these)
So could someone help me understand the origin of the error bars? Why does a huge number of particles is required to get the expected energy deposition profile? And how can I obtain physical fluctuation?
All advise are appreciated.
Thank you in advance!