 Intrabeam scattering is a risetime based on intrabeam collisions that result in momentum coupling.The betatron growth rates for intrabeam scattering are defined as,
The following is general to all bunched beams,
where formula_6, formula_7, and formula_8 are the momentum spread, horizontal, and vertical are the betatron growth times.The angle brackets  indicate that the integral is averaged around the ring.