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The MAX IV storage ring project.

Pedro F Tavares¹, Simon C Leemann¹, Magnus Sjöström¹

¹MAX IV Laboratory, Lund University, PO Box 118, SE-221 00 Lund, Sweden.

Journal of Synchrotron Radiation

|September 2, 2014

Summary

The MAX IV 3 GeV ring utilizes a multibend achromat (MBA) lattice for high-performance hard X-ray generation. This design addresses engineering challenges for future diffraction-limited light sources.

Keywords:

multibend achromat storage ring synchrotron light source

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Area of Science:

Accelerator Physics
Synchrotron Radiation Technology

Background:

MAX IV facility in Lund, Sweden, features two electron storage rings (3 GeV and 1.5 GeV) for hard and soft X-ray/VUV spectral ranges.
A 3 GeV linear accelerator serves as a full-energy injector and drives a short-pulse facility producing 100 fs X-ray pulses.

Purpose of the Study:

To present the lattice design of the MAX IV 3 GeV ring.
To detail engineering solutions for challenges associated with the multibend achromat (MBA) lattice implementation.
To validate concepts for future diffraction-limited light sources.

Main Methods:

Implementation of a multibend achromat (MBA) lattice in the 3 GeV electron storage ring.
Development of compact, combined-function magnets sharing a common yoke.
Design of a low-conductance vacuum chamber acting as a distributed copper absorber.
Utilizing non-evaporable getter (NEG) coating for reduced photodesorption and distributed pumping.
Employing a low main RF frequency (100 MHz) with third-harmonic Landau cavities for bunch elongation.

Main Results:

Achieved a bare lattice emittance of 0.33 nm·rad, reducing to 0.2 nm·rad with insertion devices.
Successfully engineered solutions for compact magnets, low-conductance vacuum chambers, and RF systems.
Demonstrated alleviation of collective effects through long bunch lengths.

Conclusions:

The MAX IV 3 GeV ring is the first realization of a light source based on the MBA concept.
The engineering solutions developed are crucial for future diffraction-limited light sources.
The facility provides a platform for validating essential concepts for next-generation synchrotron radiation sources.