The electron damping ring for the SLAC Linear Collider

A second damping ring to store and damp two electron bunches is described. Although it is generally similar to the damping ring now used for positrons, a number of design improvements and changes are discussed: the dipole magnetic field was raised to 2.1 T to improve damping; sextupole fields were provided by separate permanent magnets, rather than being incorporated in the dipoles; the vacuum chambers, including the beam-position monitors, were redesigned for lower longitudinal impedance; a new kicker was developed by Fermilab to handle the two electron bunches; and improvements were made to the DC septum magnet design.