• S.C. Leemann, J. Ahlback, Å. Andersson, M. Eriksson, M.A.G. Johansson, L.-J. Lindgren, M. Sjöström, E.J. Wallén
  MAX-lab, Lund

In 2009 the MAX IV fa­cil­i­ty was grant­ed fund­ing by Swedish au­thor­i­ties. Con­struc­tion of the fa­cil­i­ty will begin this sum­mer and user op­er­a­tion is ex­pect­ed by 2015. MAX IV will con­sist of a 3.4 GeV linac as a driv­er for a short-pulse ra­di­a­tion fa­cil­i­ty (with planned up­grade to a seed­ed/cas­cad­ed FEL) as well as an in­jec­tor for two stor­age rings at dif­fer­ent en­er­gies serv­ing user com­mu­ni­ties in sep­a­rate spec­tral ranges. Thanks to a novel com­pact multi­bend-achro­mat de­sign, the 3 GeV ring will de­liv­er a 500 mA elec­tron beam with a hor­i­zon­tal emit­tance below 0.3 nm rad to x-ray in­ser­tion de­vices lo­cat­ed in 19 dis­per­sion-free 5 m straight sec­tions. When the 3 GeV ring goes into op­er­a­tion in 2015 it is ex­pect­ed to be­come the high­est elec­tron-bright­ness stor­age ring light source world­wide. The 1.5 GeV ring will serve as a re­place­ment for both pre­sent-day MAX II and MAX III stor­age rings. Its below 6 nm rad hor­i­zon­tal emit­tance elec­tron beam will be de­liv­ered to in­frared and UV in­ser­tion de­vices in twelve 3.5 m straight sec­tions. We re­port on de­sign progress for the two new stor­age rings of the MAX IV fa­cil­i­ty.