Vibrations analysis in high-tech facility: A swedish light synchrotron

MAX-lab is a national laboratory operated jointly by the Swedish Research Council and Lund University. As of today, the MAX project consists of three facilities, (three storage rings): MAX-I, MAX-II, MAX-III and one electron pre-accelerator called MAX-Injector. A new storage ring is needed at the benefit of material science, such as nanotechnology. MAX-IV will be 100 times more efficient than existing synchrotron radiation facilities. MAX-IV will consist of a main source that will be a 3-GeV ring with state-of-the-art low emittance for the production of soft and hard x-rays as well as an expansion into the free electron laser field. The second source, the Linac injector, will provide short pulses to a short pulse facility. It will be built as an underground tunnel next to the main ring. The main objective of the present work is to study vibrations at the foundation of the light synchrotron subjected to different excitations and analyze the influence of the surrounding vibration sources on the MAX-IV Lab's underground tunnel. Since MAX-IV will be used for high precision measurements, it will be asked to have very strict technical conditions where only very low vibration levels will be allowed. The aim is to establish realistic finite element models that predict vibrations in the foundation and in the Linac with high accuracy. To achieve this purpose it will be necessary to model loads, materials, etc. with different assumptions, in order to prove the fulfillment of the needed requirements. The vibrations are analyzed by the finite element method in both transient and steady state solutions. The ring model contains the concrete floor structure, the concrete structure of the beam containment and the soil up to a depth of about 10m and extending to the nearby roads, while Linac's model has the tunnel itself, the soil (up to 10 m deep also) and the crossing bridge over it.