The tables below are the material composition stack ups of several beam line components. Materials are listed in each table in a sequence, from upstream to downstream, with information on their compositions, thicknesses, and densities.
The vacuum window and QC1 ion chamber will be upstream of any test article for the vast majority of beamline configurations. That said, the beam energy loss through those materials before ions reach a test article will have already been measured and accounted for in the quoted beam energy.
Vacuum Window
Material
Thickness (cm)
Density (g/cm³)
Description
Aluminum
0.0381
2.70
Vacuum window
QC1 or QC3 Ion Chamber
Material
Thickness (cm)
Density (g/cm³)
Description
Kapton
0.00254
1.42
Gas window
Nitrogen
1.0
1.17E-03
Gas
Collection foil – Kapton
0.00762
1.42
3 mil collection foil
Collection foil – copper
0.0017028
8.96
0.5 oz/ft² copper
Collection foil – gold
3.913E-06
19.3
2× 200 Angstrom gold
Nitrogen
1.0
1.17E-03
Gas
Collection foil – gold
3.913E-06
19.3
2× 200 Angstrom gold
Kapton
0.00254
1.42
Foil
Collection foil – gold
3.913E-06
19.3
2× 200 Angstrom gold
Nitrogen
1.0
1.17E-03
Gas
Collection foil – Kapton
0.00762
1.42
3 mil collection foil
Collection foil – copper
0.0017028
8.96
0.5 oz/ft² copper
Collection foil – gold
3.913E-06
19.3
2× 200 Angstrom gold
Nitrogen
1.0
1.17E-03
Gas
Kapton
0.00254
1.42
Gas window
IC-302 Ion Chamber and Wire Chamber
Material
Thickness (cm)
Density (g/cm³)
Description
Kapton
0.00508
1.42
Gas Window
Nitrogen
1.66243
1.17E-03
Gas
Aluminum
0.00254
2.70
Potential Plane
Nitrogen
1.27
1.17E-03
Gas
Aluminum
0.00254
2.70
Collection Plane
Nitrogen
1.27
1.17E-03
Gas
Aluminum
0.00254
2.70
Potential Plane
Nitrogen
1.27
1.17E-03
Gas
Aluminum
0.00254
2.70
Collection Plane
Nitrogen
1.27
1.17E-03
Gas
Aluminum
0.00254
2.70
Potential Plane
Nitrogen
7.62
1.17E-03
Gas
Aluminum
0.00254
2.70
Potential Plane
Nitrogen
0.9525
1.17E-03
Gas
Wires – Tungsten
1.60998E-06
19.3
0.7 mil wires with 12 mm pitch – 96% Tungsten
Wires – Rhenium
5.03118E-08
21.0
0.7 mil wires with 12 mm pitch – 3% Rhenium
Wires – Gold
6.70824E-08
19.3
0.7 mil wires with 12 mm pitch – 4% Gold (by weight)
Nitrogen
0.9525
1.17E-03
Gas
Aluminum
0.00254
2.70
Potential Plane
Nitrogen
1.42875
1.17E-03
Gas
Aluminum
0.00254
2.70
Potential Plane
Nitrogen
0.9525
1.17E-03
Gas
Wires – Tungsten
1.60998E-06
19.3
0.7 mil wires with 12 mm pitch – 96% Tungsten
Wires – Rhenium
5.03118E-08
21.0
0.7 mil wires with 12 mm pitch – 3% Rhenium
Wires – Gold
6.70824E-08
19.3
0.7 mil wires with 12 mm pitch – 4% Gold (by weight)
