Abstract
MAX IV will be Sweden's next-generation high-performance synchrotron radiation source. The project has recently been granted funding and construction is scheduled to begin in 2010. User operation for a broad and international user community should commence in 2015. The facility is comprised of two storage rings optimized for different wavelength ranges, a linac-based short-pulse facility and a free-electron laser for the production of coherent radiation. The main radiation source of MAX IV will be a 528 m ultra-low emittance storage ring operated at 3 GeV for the generation of high-brightness hard X-rays. This storage ring was designed to meet the requirements of state-of-the-art insertion devices which will be installed in nineteen 5 m long dispersion-free straight sections. The storage ring is based on a novel multi-bend achromat design delivering an unprecedented horizontal bare lattice emittance of 0.33 nm rad and a vertical emittance below the 8 pm rad diffraction limit for 1 A radiation. In this paper we present the beam dynamics considerations behind this storage ring design and detail its expected unique performance. (Less)
Highlights
Several high-performance third-generation synchrotron radiation sources like SLS [1], SOLEIL [2], and Diamond Light Source [3] have gone into operation in the past decade
The benefit of using small and light magnets on massive but low support blocks is that the eigenfrequencies of the magnets are pushed beyond 100 Hz [16]. This is very important for the MAX IV 3 GeV storage ring since the tolerances for beam vibrations are very tight given the ultralow beam size
Higher-order modes are pushed to relatively high frequencies, where their influence is diminished due to a poor form factor. Six such cavities operated at 250 kV gap voltage will ensure 5.3% rf momentum acceptance for a machine with four permanentmagnet damping wigglers (PMDWs) and 4.0% rf momentum acceptance for a machine with four PMDWs and ten in-vacuum undulators (IVUs) [35]
Summary
Several high-performance third-generation synchrotron radiation sources like SLS [1], SOLEIL [2], and Diamond Light Source [3] have gone into operation in the past decade. As the technology of insertion devices (IDs) develops, requirements for synchrotron sources increase This has sparked the design of advanced third-generation sources which push even higher brightness, submicron stability, and high constant stored current. Several such sources are presently under construction around the world: NSLS-II in the USA [4,5], PETRA III in Germany [6], and MAX IV in Sweden [7]. An entirely new 3 GeV storage ring which has been optimized for hard x rays will complete the MAX IV facility.
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