A Twisted Trapezoidal Shape for Geant4

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SurfaceChecker• Generate a randomparticle position P and arandom point X true on thesurface of the solid.• Ask G4 <strong>for</strong> theintersection point giventhe point P and itsdirection v (select theintersection closest to Xtrue).X reconst.X trueX reconst.The distance δ between X true andX reconst. gives us in<strong>for</strong>mationabout the goodness of thereconstruction.δv rPNov 2003 Oliver Link, EP-SFT 12
Results I0.10.090.080.070.06boxconeorbspheretorustubetwistedboxtwistedtrap2twistedtrap3twistedtraptwistedtrdtwistedtubs0.050.040.030.020.01010 -12 10 -11 10 -10 10 -9 10 -8 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 1 10 10 2 10 3 10 4 10 5dist (mm)Nov 2003 Oliver Link, EP-SFT 13δ
Page 1 and 2: A Twisted TrapezoidalShape for Gean
Page 3 and 4: ⎛⎜⎜( w(u,ϕ)+ Δx⎜(w(u,ϕ)+
Page 5 and 6: G4TwistedBoxfDxfDyG4TwistedBox(Name
Page 7 and 8: G4TwistedTrapTwisted trapezoid with
Page 9 and 10: Solved ProblemsThe visualisation sh
Page 11: Testing the SolidWith traditional t
Page 15: Conclusions• G4TwistedBox with eq

A Twisted Trapezoidal Shape for Geant4

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