The aim of the is note is to estimate the effects, if any, of trapped ions in the e‐rings of a B‐Factory (in the ISR ring) machine, actually under study.Figures found in this note will probably be obsolete, at the time of its publication, as the machine and beam parameters are still, at the moment, in a ‘‘transitory state’’.However formulae and qualitative reasoning, given here as a reminder, should still be valid (we hope).