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None Quadrupole lens 

Forum: Fields: Magnetic and Otherwise
Date: 18 Feb, 2016
From: Aleksei <Aleksei>

Hello everyone. I try to create a quadrupole lens or field. But trajectories of protons after passage of particles through a logical volume with quadrupole field are at 45 degrees relative to axis. Why is it so?

My source code:

G4double fGradient = 2000*gauss/m; G4QuadrupoleMagField *pipeField = new G4QuadrupoleMagField(fGradient); G4Mag_UsualEqRhs* myEquationq = new G4Mag_UsualEqRhs(pipeField); G4MagIntegratorStepper* myStepperq = new G4ClassicalRK4(myEquationq, 8); G4ChordFinder* myChordFinderq = new G4ChordFinder(pipeField,0.1*mm, myStepperq); G4FieldManager* fieldMgrq = new G4FieldManager(pipeField,myChordFinderq,false);

G4Box *solidB = new G4Box("solidB", 1*m, 1*m, 1*m);
G4LogicalVolume* logicB = new G4LogicalVolume(solidB, Mat("G4_Galactic"), "logicB",fieldMgrq);
new G4PVPlacement(0, G4ThreeVector(5*m,5*m,-7*m), logicB,
                                           "physiB", world->getLogic(), false, 0);

Please help. Thank you.)))))))

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1 None: Re: Quadrupole lens   (Aleksey - 18 Feb, 2016)
2 Warning: Re: Quadrupole lens   (Aleksey - 20 Feb, 2016)
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