Lars-Johan Lindgren

The MAX II synchrotron radiation storage ring

A 1.5 GeV third generation storage ring optimised for the VUV and soft X-ray spectral region is currently being built at MAX-lab. The magnet lattice, ring architecture and production choices are optimised to fit within rather tight boundary conditions without sacrificing performance. In this paper, the magnet lattice, light characteristics, injection and technical solutions for the ring are presented.

Magnet design for a low-emittance storage ring

The magnet design of the MAX IV 3 GeV storage ring replaces the conventional support girder + discrete magnets scheme of previous third-generation light sources with a compact integrated design having several consecutive magnet elements precision-machined out of a common solid iron block.

MAX-IV lattice, dynamic properties and magnet system

At MAX-LAB the next synchrotron light source MAX-IV is currently studied (Proceedings of the seventh European Particle Accelerator Conference, EPAC 02, Paris, France, 2002). In this paper, we present a possible lattice with horizontal emittance of 1.2 nm rad at an energy of 3 GeV. The possibilities to realise the main magnetic system with high gradient integrated magnets are studied with 2D and 3D magnetic field programs. The dynamic properties for the lattice are also studied and some higher order corrections are discussed.

Experiences with the max accelerator system in the pulse-stretcher mode

Abstract The accelerator system MAX has now for a couple of years produced a stretched electron beam of up to 95 MeV energy in stretcher mode and stored currents around 250 mA at 550 MeV energy in storage mode. This paper gives the current status of the pulse stretcher. Changes of hardware and operation conditions, compared to the design, are given together with experiences gained.

Pulse-stretcher upgrade

A new 250 MeV energy electron pulse-stretcher mode is designed where the MAX I ring is injected from a new linac system (Nucl. Instr. and Meth. A 490 (2002) 592). For the new slow extraction, we will try to achieve a lower emittance in the extraction plane by using a different extraction method. Injection and slow extraction are simulated.

The max-IV design: Pushing the envelope

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.

A cascaded optical klystron on an energy recovery linac – race track microtron

We are currently investigating a device capable of generating continuous, coherent radiation down in the Angstrom region in sub-ps pulses in a relatively compact set-up. By placing a cascaded optical klystron (OK) in the return path of a 3 GeV Race Track Microtron operating in Energy Recovery mode Harmonic Generation can be performed in several stages in parallel. A four stage OK can generate Angstrom radiation from a 266 nm seed. The demands on the electron optics are severe, but the requirements on the electron beam are not extreme. The layout of a possible facility is presented and the basic concepts are discussed below

Septum magnet design

New magnetic DC septa are designed for the upgraded Max I and the new Max III storage rings, respectively. The new septum is made magnetically symmetric with a magnetic flux filter in the septum nose. The residual stray fields in the ring tube become almost linear and the usually strong stray fields close to the septum sheet are eliminated. If necessary a final correction of the linear part could be done in the injection straight.

Status of the MAX IV light source project

The MAX IV light source project is presented. The MAX IV light source will consist of three low emittance storage rings and a 3 GeV injector linac. The three storage rings will be operated at 700 MeV, 1.5 GeV, and 3.0 GeV, which make it possible to cover a large spectral range from IR to hard X-rays with high brilliance undulator radiation from insertion devices optimised for each storage ring. The preparation of the injector linac to serve as a short pulse source and the major sub-systems of the facility are also presented.

The Magnet Lattice of the MAX IV Storage Rings

A successor of the present MAX facility is currently being studied. This proposed MAX IV facility will then have two new storage rings operated at 1.5 and 3 GeV respectively. The magnet lattices of the two storage rings are almost identical and the rings are placed coaxially, one on top of the other. A third ring, the MAX III ring, now under construction, should be transferred to the new facility. These three rings will then offer dipole IR radiation and undulator radiation from 5 eV up to 20 keV. The total number of straight sections is 32, of which 28 could be used for insertion devices. A 3 GeV linear accelerator will be used as injector for the three rings. The linac could also be used as a Free Electron Laser source. The magnet lattice of the two new rings is described below. The electron beam emittance of the 3 GeV storage ring is 0.86 nm rad and 0.3 nm rad for the 1.5 GeV ring. The circumference of the rings is 286 m..