It is proposed to use an isochronous storage ring, having the particle revolution frequency independent of energy, to achieve a high luminosity with a small beam current.The advantages of an isochronous ring are: the possibility of reducing the bunch length from the present centimeter range to the millimeter range; the elimination of one class of resonances, the synchro‐betatron resonances, limiting the beam density at the collision point and the interaction region geometry. (AIP)