Recommended DELTARAY and EMFCUT cards for muon studies and energy deposition spectra

Physics, Transport and Magnetic Fields
1

Dear experts,

I am dealing with muons of 4 GeV that hit a simple construction and calculate with EVENTBIN

the energy deposition in the gas volume. I used the PRECISIO default that has 100 keV threshold for e+, e- , gammas as well as for muons and delta rays.

If I run it without changing the default options I am getting in the energy spectra some strange peaks around 100 keV that I suppose are due to the threshold on EMF.

Changing to 1 keV with a cost on CPU time (look at the 1st pict attached) those peaks are smeared out but on average the total energies are the same. So, I decided to use a threshold at 10 keV that does not result in very long runs.

Also, (look at the 2nd pict attached), the muon energy deposition spectra change dramatically by using a DELTARAY 0.00001 (10 keV) instead of the default one (at 100 keV).

In the total energy deposition the DELTARAY does not change a lot the average value…

But in muons why? I know that in reality energy is eventually deposited by electrons only.
Thus, AUXSCORE gives the fraction due to ionization by muons, depending on the arbitrary delta ray threshold. Therefore, in this muon study, what thresholds do you recommend me to use in order to reproduce correctly the energy deposition spectra in the gas in order to calculate detection efficiencies? Is of any importance in terms of physics this difference in muon deposition spectra for different thresholds?muon_4deltaORG_PARTTHR_DET.inp (11.1 KB)

deltaThr
deltaThr649×553 42.7 KB
elphotThr
elphotThr661×533 40.9 KB

Thanks a lot in advance

Georgios

2

Hi @tsiledak,
starting from a detail:

I used the PRECISIO default that has 100 keV threshold for e+, e- , gammas as well as for muons and delta rays

Actually not for gammas (33 keV).

Coming to the core of your question:

Thus, AUXSCORE gives the fraction due to ionization by muons, depending on the arbitrary delta ray threshold.

This is the case, that’s why such a filtered scoring has a quite questionable meaning, if any.

Is of any importance in terms of physics this difference in muon deposition spectra for different thresholds?

Not really, as per above, since what matters is the energy actually deposited in the gas volume, not which particle it is arbitrarily attributed to.

Therefore, in this muon study, what thresholds do you recommend me to use in order to reproduce correctly the energy deposition spectra in the gas in order to calculate detection efficiencies?

Electron thresholds such as the respective electron range in the gas is reasonably small with respect to the gas volume.