Impact of the e-p option on Isabelle experimental areas

There have been many suggestions for the expansion of existing or planned storage rings to include high energy e-p collisions. We will not discuss the physics potential here, but there is a general concensus that a facility with protons colliding with electrons and positrons of selectible helicity would provide great insight into weak interactions, nucleon structure, etc., in a way not duplicated at e+e-, pp, nor anti pp machines. In this report, some aspects of the addition of a 10 to 20 GeV electron ring to Isabelle are discussed