Commissioning of the First Insertion Devices on the 1.5 GeV Storage Ring in MAX IV

Sammanfattning: When installing an insertion device (ID) in a storage ring the electron beam is affected. The positional displacement and angle deflection is called orbit displacement (OD) and higher order effects such as focusing of the electron beam are referred to as linear optics. The ability to perform multiple simultaneous experiments is crucial in a synchrotron light source such as MAX IV. This is impossible to achieve if one ID affects the output of another through the electron beam, making correction for an ID's effect on the beam imperative. This thesis covers the commissioning process of the first ID to be installed in the MAX IV 1.5 GeV storage ring (R1). The OD and linear optics of an elliptically polarised undulator (EPU) was to be compensated for in a feed forward approach. In essence the commissioning should make the ID transparent to the electron beam. A general procedure was developed using MATLAB and other software and libraries by first solving the problem on a model of the ring and then in the real storage ring. The electron orbit was corrected down to 1 micrometer for most settings of the ID which is close to the noise level of the measuring system of the ring. The commissioning is considered successful and the ID is ready for beamline delivery and will be able to run without affecting other beamlines. It was discovered that some magnetic coils performed 25 percent below their specifications, and that the beta beat of the bare R1 was at its worst 15 percent, something that should be improved for optimal performance of the facility.