Accelerator physics studies of the MAX-lab storage rings

Sammanfattning: Within research, synchrotron radiation is a highly useful probe for the study of materials, their properties and structures. Currently, no other radiation source allows the combination of high intensity and short wavelengths. The 3rd generation light sources currently in use for the production of synchrotron radiation are however considerable investments: for already existing facilities this makes it important to ensure high operational reliability as well as good performance. For facilities in planning, such as the MAX IV light source, extensive design studies are of essence to meet target performance. The main subject of this thesis is the performance, characterisation and tuning of the existing MAX II and MAX III light sources at the MAX-laboratory, one of two national research facilities in Sweden. The MAX II storage ring, in operation since 1995, was characterised using response matrix analysis, bunch spectrum analysis and transverse beam profile measurement. In particular, some at the time of building unconventional technology solutions were evaluated: combined quadrupole-sextupole magnets, non-zero dispersion in straight sections and common girders for all magnets in one cell. The MAX III storage ring, commissioned in 2007 and starting synchrotron radiation production in late 2008, was characterised using response matrix and bunch spectrum analysis. Further, measurements were carried out of the betatron tunes, chromaticities, beam lifetime, magnets, pole-face strips as well as the RF parameters. Accurate characterisation of MAX III served dual purposes: improvement of MAX III performance and evaluation of new accelerator technology intended also for the MAX IV project. Initial MAX III operational experience showed that the dipole magnets used for orbit correction frequently saturated. To remedy this problem, the ring was realigned using the beam as a reference. The data required was the corrector magnet strengths. The thesis also encompasses some Intrabeam Scattering studies for two versions of a prototype multi-bend achromat lattice: a 12 cell and a 20 cell version. The lattice was designed for low-emittance light sources and is used as the basis of the MAX IV storage ring.