ISABELLE e-p Option

During the ISABELLE preliminary design study it became clear from the response of the high energy physics community that the addition of an electron ring to the proposed 200-GeV colliding proton beam facility would be very attractive. It was felt that with the capability of this ring to reach an energy of 15 GeV the already wide range of experimental possibilities of ISABELLE would be greatly extended. Basic design features for such an electron ring have been worked out. Lattice parameters, rf system, injection scheme and characteristics of its interaction with one of the proton rings will be presented. The resulting luminosity was estimated to range from ≈ 1033 to ≈ 0.5 × 1032 cm-2 sec-1 for c.m. energies from 65 to 109 GeV.