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The proposed MAX IV facility is meant as a successor to the existing MAX-lab. The accelerator part will consist of three storage rings, two new ones operated at 3 and 1.5 GeV respectively and the existing 700 MeV MAX III ring. The two new rings have identical lattices and are placed on top of each other. Both these rings have a very small emittance, 0.86 and 0.4 nm rad respectively, and offer synchrotron radiation of very high mean brilliance. As an injector, a 3 GeV linear accelerator is planned. The design philosophy and the special technical solutions called for are presented in this paper.

The status of the new injector system for MAX-lab is presented. The electron source is a thermionic RF-gun that has been designed at MAX-lab. The new injector will consist of two linac structures equipped with SLED cavities. This will produce an electron beam with an energy of 250 MeV. This beam will be recirculated in order to obtain a 500 MeV beam.

In December 1998 the FRN-The Swedish Council for Planning and Coordination of Research-decided to fund a new injector and storage ring for the MAX-laboratory. The system will consist of a 50-MeV linac, a 600-MeV booster synchrotron, and a 600-MeV storage ring for VUV undulator beamlines. The system will replace an old 100-MeV racetrack microtron and will inject the two existing storage rings: the 550-MeV MAX I and the 1.5-GeV MAX II, as well as the new 600-MeV storage ring. The linac injector will also be designed with intentions to provide electrons for a future infrared free-electron laser (IR-FEL) facility. The detailed design of the system began in January 1999 with a planned first beam in the summer of 2001.