The high-resolution electron–ion collision facility at TSR

A new electron beam facility at the storage ring TSR is presented which makes electron–ion collision experiments possible without using the existing electron cooler device as an electron target. A long adiabatic acceleration section combined with magnetic adiabatic expansion (factor up to ≈90) is used to reduce the longitudinal and transverse electron temperatures. The facility can be operated with either a thermionic or a photocathode. Results from two-dimensional electron beam profile measurements and longitudinal electron energy distribution measurements are discussed.