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Question influence of additional volume to the data 

Forum: Geometry
Date: 07 Dec, 2011
From: KiSoo Lee <KiSoo Lee>

I have made a simulation.

in the simulation a proton passes through magnet and reached to detector.

when I reconstruct it's energy it is same with the initial energy.

environment of the laboratory is rare air 1.29*10^-3.

element ratio is N: O: Ar = 75.47: 23.20: 1.28

there was no problem.

but when I added magnet shape, the energy was splitted into to peak.

this is the magnet shape code.

G4Box* MagSolid = new G4Box("MagSolid", magnetX/2, magnetY/2, magnetZ/2);
G4LogicalVolume* MagLV = new G4LogicalVolume(MagSolid, Vacuum, "MagLV");
G4VPhysicalVolume* MagPV = new G4PVPlacement(0,
                                        G4ThreeVector(0, 0, -200*cm),
G4VisAttributes* MagVisAttrib = new G4VisAttributes(G4Colour(1., 0., 0.));
MagLV -> SetVisAttributes(MagVisAttrib);

Vacuum is the laboratory air. and the location is same with magnetic field location.

I heard that this structure is not influence to the particle. because it's environment is same with laboratory.

I want to know the reason why it influence to the particle orbit.

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1 Idea: Re: influence of additional volume to the data   (Vladimir Ivanchenko - 09 Jan, 2012)
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