A STRAIGHT SECTION DESIGN IN RHIC TO ALLOW HEAVY ION ELECTRON COOLING

The Relativistic Heavy Ion Collider (RHIC) has been continuously producing exciting results. One of the major luminosity limitations of the present collider is the intra beam scattering. A path towards the higher luminosities requires cooling of the heavy ion beams. Two projects in parallel electron and stochastic cooling are progressing very well. To allow interaction between electrons and the RHIC beams it is necessary to redesign one of the existing interaction regions in RHIC to allow for the longer straight section with fixed and large values of the betatron functions. We present a new design of the interaction region for the electron cooling in RHIC. INRODUCTION RHIC has exceeded designed beam intensities and luminosity requirements during first few years of operation. Unfortunately, as predicted, intrabeam scattering presents a major limitation for luminosity enhancement during heavy ion collisions. The luminosity upgrade requires electron and stochastic cooling to suppress the intrabeam scattering. The average luminosity of the Au 79+ on Au 79+ collisions, should reach ~70 . 10 26 cm -2 s -1