Dear colleagues, in developing a simulation for a test beam I am having a hard time understanding the meaning of the Transportation process.
I have a 500 MeV electron traveling through a scintillator; my physics list is the QCCB. If I try to look at the steps in the scintillators, I see a list of steps associated to three processes: eBrem, eIoni and Transportation.
The last one always appears when the electron is crossing the border of the scintillator volume, produces no secondaries and is associated with a considerable energy loss (comparable with the other two processes). Some slides and documentation material generically refers to Transportation as a process associated with the last step of a particle in a medium; however, I cannot understand its physical meaning. Is it a non-radiative, non-ionizing energy loss? How does it differ from, say, coulombian scattering?
Here is an example of debugging lines from some events:
Scintillator, process: eBrem, deposit (MeV): 3.15843, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: eBrem, deposit (MeV): 0.0662966, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 0.515436, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eBrem, deposit (MeV): 2.18718, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 1.4499, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eBrem, deposit (MeV): 0.0867602, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 3.32824, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eIoni, deposit (MeV): 3.18942, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 0.110654, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eBrem, deposit (MeV): 1.84543, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: eIoni, deposit (MeV): 0.598441, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 0.927637, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eBrem, deposit (MeV): 0.0793947, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 2.98721, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eBrem, deposit (MeV): 1.58434, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: eBrem, deposit (MeV): 0.260091, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 1.42572, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eBrem, deposit (MeV): 3.2917, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 0.000797846, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: Transportation, deposit (MeV): 3.5226, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: Transportation, deposit (MeV): 3.06046, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eIoni, deposit (MeV): 0.38364, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: eIoni, deposit (MeV): 0.509544, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 2.54701, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: eIoni, deposit (MeV): 1.47007, from ScintiPhysical1 to ScintiPhysical1, n. secondaries: 1
Scintillator, process: Transportation, deposit (MeV): 1.78541, from ScintiPhysical1 to Envelope, n. secondaries: 0
Scintillator, process: Transportation, deposit (MeV): 3.22091, from ScintiPhysical1 to Envelope, n. secondaries: 0
Thank you all in advance!