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Beam based feedback
max rate db3/dt ? 0.067 units/second, 3 - 5 units Q�/second
? 1 unit per second given the 80% from the magnet factory (NB out of tolerance in 1 second)
Chromaticity is NOT an easy measurement and is not likely to be available for the physics beams (emittance growth). Available for pilots ? reproducibility (again�)