AN ADIABATIC ELECTRON GUN FOR THE CRYRING ELECTRON COOLER

An adiabatic electron gun for the Cryring electron cooler is de-scribed. The criteria for adiabatic acceleration are briefly sum-marised and results from calculations of the transverse electron temperature as a function of gun perveance and magnetic field are presented. Cooler The electron cooler for Cryring [l] will cool highly charged heavy ions with energies from 3.6 MeV/u, requiring 2 keV elec-trons, up to the highest ion energies in Cryring, corresponding to 13.5 keV electrons. It shall also be able to work as an elec-tron target for atomic-physics experiments at electron energies up to 20 keV. The main design parameters, still preliminary, of the cooler are given in table 1. Other particular features of this cooler are the high vacuum required to avoid charge exchange of the ions and the fast ramping of the cooler field together with the rest of the magnets in the ring