Duke FEL Lab Storage Ring arc vacuum system upgrade

The Duke FEL Lab Storage Ring vacuum system has provided reliable UHV operation since commissioning in 1994. Upgrade of the vacuum system is now in progress. Completion of crotch absorber installation will now allow full power operation (1 Amp @ 1 GeV). Since high power operation; will increase the gas load in the arcs, additional pumping, will be required to maintain (and improve) the beam lifetime. To meet this demand we are planning to install TSP modules and bakeout the arc chambers this fall.