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Re: Multiple scattering model in GEANT3 [message #8573 is a reply to message #8443] Sun, 17 May 2009 22:37 Go to previous messageGo to previous message
Mohammad Al-Turany is currently offline  Mohammad Al-Turany
Messages: 518
Registered: April 2004
Location: GSI, Germany
first-grade participant
From: *

Here is the explanation of the flags in g3config.C and SetCuts.C



Decay in flight. The decaying particle stops. The variable IDCAY controls this process. See [CONS310, PHYS400].
0 - No decay in flight.
1 - Decay in flight with generation of secondaries. Default setting.
2 - Decay in flight without generation of secondaries.


Multiple scattering. The variable IMULS controls this process. For more information see [PHYS320 or 325 or 328].
0 - No multiple scattering.
1 - Multiple scattering according to Molière theory. Default setting.
2 - Same as 1. Kept for backward compatibility.
3 - Pure Gaussian scattering according to the Rossi formula.


Nuclear fission induced by a photon. The photon stops. The variable IPFIS controls this process. See [PHYS240].
0 - No photo-fission. Default setting.
1 - Photo-fission with generation of secondaries.
2 - Photo-fission without generation of secondaries.


Muon-nucleus interactions. The muon is not stopped. The variable IMUNU controls this process. See [PHYS431] for more details.
0 - No muon-nucleus interactions.
1 - Muon-nucleus interactions with generation of secondaries. Default setting.
2 - Muon-nucleus interactions without generation of secondaries.


Continuous energy loss. The variable ILOSS controls this process.
0 - No continuous energy loss, IDRAY is set to 0.
1 - Continuous energy loss with generation of delta rays above DCUTE (common/GCUTS/) and restricted Landau fluctuations below DCUTE.
2 - Continuous energy loss without generation of delta rays and full Landau-Vavilov-Gauss fluctuations. In this case the variable IDRAY is forced to 0 to avoid double counting of fluctuations. Default setting.
3 - Same as 1, kept for backward compatibility.
4 - Energy loss without fluctuation. The value obtained from the tables is used directly.


Photoelectric effect. The interacting photon is stopped. The variable IPHOT controls this process. More info [PHYS230].
0 - No photo-electric effect.
1 - Photo-electric effect with generation of the electron. Default setting.
2 - Photo-electric effect without generation of the electron.


Compton scattering. The variable ICOMP controls this process. For additional information see [PHYS220].
0 - No Compton scattering.
1 - Compton scattering with generation of e-. Default setting.
2 - Compton scattering without generation of e-.


Pair production. The interacting gamma is stopped. The variable IPAIR controls this process. More info [PHYS210]
0 - No pair production.
1 - Pair production with generation of e-/e+. Default setting.
2 - Pair production without generation of e-/e+.


Bremsstrahlung. The interacting particle e+, e-, mu+, mu- is not stopped. The variable IBREM controls this process. More details in [PHYS340].
0 - No bremsstrahlung.
1 - bremsstrahlung with generation of gamma. Default setting.
2 - bremsstrahlung without generation of gamma.


Rayleigh effect. The interacting gamma is not stopped. The variable IRAYL controls this process. See [PHYS250] for details.
0 - No Rayleigh effect. Default setting.
1 - Rayleigh effect.


delta ray production. The variable IDRAY controls this process. See [PHYS430]
0 - No delta rays production.
1 - delta rays production with generation of . Default setting.
2 - delta rays production without generation of .


Positron annihilation. The e+ is stopped. The variable IANNI controls this process. For reference see [PHYS350].
0 - No positron annihilation.
1 - Positron annihilation with generation of photons. Default setting.
2 - Positron annihilation without generation of photons.


Hadronic interactions. The particle is stopped in case of inelastic interaction, while in case of elastic interaction it is not stopped. To simulate the interactions of hadrons with the nuclei of the matter traversed, four alternatives are provided:
1.The generator of the FLUKA hadron shower MonteCarlo and the interface routines to GEANT. See [PHYS520] for more information.
2.The generator of the GHEISHA hadron shower MonteCarlo and the interface routines to GEANT. See [PHYS510] for more details.
3.The generator of the GCALOR hadron shower MonteCarlo and the interface routines to GEANT.(works only on 32 bit )

The variable IHADR controls this process.
0 - No hadronic interactions.
1 - Hadronic interactions with generation of secondaries using GHEISHA package.
2 – same as 1.
3 – same as 1.
4 - Hadronic interactions are simulated using FLUKA package.
5 - Hadronic interactions are simulated using GCALOR package.


Light ABSorption. This process is an absorption of light photons (particle type 7) in dielectric materials. It is turned on by default when the generation of Cerenkov light is requested (data record CKOV). For more information see [PHYS260].
This process controlled by ILABS.
0 - No absorption of photons.
1 - Absorption of photons with possible detection.


This flag turns on the collision sampling method to simulate energy loss in thin materials, particularly gases. For more information see [PHYS334].
The control variable is ISTRA .
0 - Collision sampling is switched off. Default setting.
1 - Collision sampling is activated.


Synchrotron radiation in magnetic field. Defined by variable ISYNC. See [PHYS360].
0 - The synchrotron radiation is not simulated. Default setting.
1 - Synchrotron photons are generated, at the end of the tracking step.
2 - Photons are not generated, the energy is deposited locally.
3 - Synchrotron photons are generated, distributed along the curved path of the particle.

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