GEANT4 FLUX SIMULATIONS

Dorothea PfeifferGIF++ Discussion21.02.2013

2

GIF++ Geometry

21.02.2013Dorothea Pfeiffer

roof chamberIrradiator with filter frame

floor chamber

Steel floor (2 cm)

Finetracking chamber

• Irradiator with lead filters• RPC chambers surrounded by 4 cm of steel• Floor chamber also covered by 17 cm of steel• Beam trigger shielded by 5mm Tungsten rubber• Roof chamber shielded by 2 cm lead plate in air

Lead shield for roof chamber

Beam trigger

Beam trigger

3

GIF++ coordinate system

Dorothea Pfeiffer

Muon beam x=0cm, y = 0 cm

Source x= -200 cm, y = 0 cm, z = 0 cm (cosmics) x= -50 cm, y = 0 cm, z = 0 cm (muons)

Cosmic trigger floor Position: x=-200 cm, y=-197.5 cm, z= 300 cm

Dimension: x= 240 cm, y=20cm, z=280 cm

Fine tracker Position: x=-200 cm, y=-158 cm, z = 110 cm Dimension: x=50 cm, y=20 cm, z = 100 cm

Roof chamber Position: x=-200 cm, y=330 cm, z = 255 cm Dimension: x=50 cm, y=40 cm, z = 100 cm

Beam trigger Positions: x=0 cm, y= 0 cm, z = +/- 600 cm Dimension: x=60 cm, y=40 cm, z = 20 cm

21.02.2013

4

GIF++ projection yz source

Dorothea Pfeiffer

21.02.2013

roof chamber

Lead shield

steel platefine trackerfloor

chamber

Average flux above source 4.7e5 s^-1 cm^ -2

5

GIF++ projection yz beam line

Dorothea Pfeiffer

21.02.2013

beam trigger beam trigger

Downstream average flux 1.8e4 s^-1 cm^ -2

Upstream average flux 5.9e4 s^-1 cm^ -2

6

GIF++ projection xz source

Dorothea Pfeiffer

13.02.2013

beam trigger beam trigger

Downstream average flux 1.8e4 s^-1 cm^ -2

Upstream average flux 5.9e4 s^-1 cm^ -2

7

GIF++ projection xz top of floor

Dorothea Pfeiffer

21.02.2013

fine tracker

Average flux 5.1e5 s^-1 cm^ -2

8

GIF++ projection xz under floor

Dorothea Pfeiffer

21.02.2013

floor chamber

Average flux 1.2e3 s^-1 cm^ -2

9

GIF++ projection xz roof

Dorothea Pfeiffer

21.02.2013

roof chamber

Average flux 1.0e5 s^-1 cm^ -2

10

GIF++ example spectra

Dorothea Pfeiffer

21.02.2013

Fine tracker

Roof chamber