Investigation of chromaticity sharing at the Cornell Electron Storage Ring

A potential advantage of the “Mobius” scheme, or any other strongly coupled lattice, is that the normal-mode oscillations are damped at rates which depend on both the horizontal and vertical chromaticities. This opens up the possibility of maintaining adequate damping even for quite negative chromaticity in one plane, provided the other is appropriately increased to compensate. This “chromaticity sharing” has been observed at CESR by introducing resonant coupling with weak skew quadrupoles and observing the coherent damping rates of shock-excited betatron oscillations