An Introduction to the Ion-Optics of Magnet Spectrometers

Achromatic magnet separator with Wedge
↓ “Wedge” = 0.1 mm “Si=detector”
A
^
E-loss in WEDGE ΔE ~ Z 2 /v 2
Isotopes with different Z have
different velocities v
Therefore A/Z selection in B
B
Figure from Experimental Techniques at NSCL, MSU, Th. Baumann, 8/2/2002
Effect of “Wedge” ⇒
Note:
For large dp/p) the
degrader should be
Wedge-shaped to
restore achromaticity
effected by degrader
with constant thickness