Mass Filtering Fingers |
A schematic sketch of the fingers inside Q3 and data taken with a position sensitive detector at the achromatic focal plane. The horizonal spectrum in the middle is the normalized one-dimensional spatial distribution of recoils at the achromatic focus with and without fingers blocking charge state 23+. The normalized count rate spectrum on the right displays the number of recoils reaching the achromat as the position of one finger inside Q3 is changed. Note the dips in this spectrum caused by the fingers intercepting the focussed beam.
This system has been designed and fabricated by ORNL.