High Energy Electron Cooling to Improve the Luminosity and Lifetime in Colliding Beam Machines

Electron cooling can be applied to improve the performance of high energy colliding beams of hadrons and e-p storage rings. Normal beam excitations such as multiple scattering, resonance growth, or beam-beam interaction can be controlled, leading to longer beam lifetimes, and in some situations to higher luminosities and larger tolerable tune shifts. The electrons, in a small storage ring, are cooled by radiation and heated by the hadron beam. An equilibrium is reached in which the hadron beam is cooled. The electron beam requires strong cooling by "wigglers". We have designed a simple cooling experiment for the Fermilab synchrotron.