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Resolution & UV rejection
Linear TOF are limited by total flight time
- 50 cm is perhaps a practical limit to length
- Electrostatic mirrors (e.g. ROSETTA), can double or quadruple TOF, but not 10x, 100x.
Linear TOF doesn’t reject neutrals & photons
- separate UV traps have to be installed
Long TOF & UV rejection are possible with a helical path. The best of both worlds.