The derivative of transverse betatron tune with respect to relative momentum error . For a thin-lens FODO cell with fixed quadrupole fields, natural cell chromaticity is on the stable phase-advance branch. Zero corrected chromaticity requires additional momentum-dependent focusing.
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Chromaticity refers to the quality of a color that encompasses both its hue (the type of color) and its saturation (the intensity of the color). In other words, it describes how colors differ in their visual appearance and characteristics without considering their brightness or luminance. Chromaticity is often represented in a chromaticity diagram, which typically has two axes representing the color's hue and saturation.