Message: Re: Electromangnetic physics Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

Question Re: Electromangnetic physics 

Forum: Physics List
Re: None Electromangnetic physics (Taylan Yetkin)
Re: None Re: Electromangnetic physics (Vladimir IVANTCHENKO )
Date: 21 May, 2005
From: Huaimin Liu <Huaimin Liu>

Hi, Vladimer,

These physicslists are NOT equivalent for EM in our simulation!!

For Muon physicslist, in hadronic package (MuonPhysics.cc),
the processes added like this,

    pManager = G4MuonPlus::MuonPlus()->GetProcessManager();

    pManager->AddProcess(&fMuPlusIonisation, ordInActive,2,2);
    pManager->AddDiscreteProcess(&fMuPlusBremsstrahlung);
    pManager->AddDiscreteProcess(&fMuPlusPairProduction);

    pManager->AddProcessp(&fMuPlusMultipleScattering);
    pManager->SetProcessOrdering(&fMuPlusMultipleScattering,
                                 idxAlongStep, 1);
    pManager->SetProcessOrdering(&fMuPlusMultipleScattering,
                                 idxPostStep, 1);
    ... similar for MuonMinus

But in novice example N02, the Muon processes are (ExN02PhysicsList.cc)

    pmanager->AddProcess(new G4Multiplescattering,-1,1,1);
    pmanager->AddProcess(new G4MuIonisation,      -1,2,2);
    pmanager->AddProcess(new G4MuBremsstrahlung,  -1,3,3);
    pmanager->AddProcess(new G4MuPairProduction,  -1,4,4);

If the two physicslists are equivalent, for a single MuonPlus particle,
we should get the same result. But our momentum resolution is different
in these two cases, the first one gives 28 MeV, the second one gives
5 MeV, 5 MeV seems to be correct in our simulation.

We declare the only differnce in our simulation is the substitution
of the Muon Physics from N02 to hadronic muon package.
We are using GEANT4.70+p01. 
I am wondering if the muon physics list in hadronic package is the 
standard EM for muon.

Huaimin Liu
IHEP, Beijing

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 None: Re: Electromangnetic physics   (Wellisch, J.P. - 23 May, 2005)
3 Warning: Re: Electromangnetic physics   (Wellisch, J.P. - 23 May, 2005)
1 None: Re: Electromangnetic physics   (liuhm@ihep.ac.cn - 23 May, 2005)
(_ None: Re: Electromangnetic physics   (Wellisch, J.P. - 24 May, 2005)
(_ More: Re: Electromangnetic physics   (Wellisch, J.P. - 16 Aug, 2005)
 Add Message Add Message
to: "Re: Electromangnetic physics"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]