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Design of scattering foils
Warsaw 2017
51
Primary foil: High
Z
-mtrl, e.g. Au or Ta, gives the highest linear
scattering power vs. collision stopping power, i.e. the most effective
scattering. Thickness (t)
0.05-0.4 mm (energy dependent).
Secondary foil: Lower
Z
-mtrl, e.g. Al, often used in order to
reduce bremsstrahlung production. Thickness (h) < 3 mm.
~
0-10 cm
downstream from
geom. focal point
3-10 cm further
downstream
Bieda
et al
[12]
e
-
FWHM
1-3 mm
e
-
T Knöös