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The Foilless Chopper
A chopper produces a fixed time signal
- used extensively since at least Fizeau, ~1800
- used in laboratory/space TOF, e.g. ROSETTA TOF
For ions, it need not have moving parts, using electrostatics.
- ENA is a different story but may have a MEMS solution
However, it trades efficiency vs. resolution
- ambiguities generated for multiple packets.
- This can be partially solved with Hadamard transforms.
- Alternatively, combining magnetic sector & chopped TOF can remove the ambiguity with better noise tolerance.
- Position sensing also can be used to remove ambiguities, giving this design a number of alternative paths toward higher sensitivities.