Doctoral dissertation

Dissertation: A study on Future Circular Collider availability led to developments in operation and reliability modelling

The Future Circular Collider (FCC) study develops scenarios for high-energy and high-luminosity frontier circular colliders at the European Organization for Nuclear Research (CERN) for use in the post-Large Hadron Collider (LHC) era.

The particle collider that is being designed will be four times larger than the current LHC. The high availability of the machine is crucial for the efficient use of the research infrastructure, which needs to be taken into account in design from the start in order to ensure a successful physics programme.

M.Sc. (Tech.) Arto Niemi wrote his doctoral dissertation “Modeling Future Hadron Colliders’ Availability for Physics” while working at CERN. The dissertation studies which accelerator operations factors affect availability and how they can be taken into account in operations modelling. The key findings of the dissertation are included in the FCC conceptual design report, and the work led to two peer-reviewed research papers.

The first paper validated Niemi’s modelling approach with data collected from the Large Hadron Collider operations. The model was created with the ELMAS modelling platform of Ramentor Oy. This initial study motivated a collaboration project between CERN, Ramentor Oy and Tampere University to increase the functionality, usability and performance of the modelling tool. The project led to the development of the OpenMARS approach that supports the joint modelling of availability and operations. The approach was documented in the CERN report and a peer-reviewed article. Niemi hopes that the results of this research may be successfully used in industry further projects.

The doctoral dissertation of M.Sc. (Tech.) Arto Niemi will be publicly examined in the Faculty of Engineering Sciences at Tampere University at noon on Wednesday, 17 April 2019 in auditorium FA032 of the Festia building of Tampere University, Hervanta campus, address: Korkeakoulunkatu 8.  The Opponents will be Doctor Annika Nordt from the European Spallation Source and Associate Professor Samuel Jean Bassetto from Polytechnique Montréal. Professor Eric Coatanéa from the Faculty of Engineering and Natural Sciences at Tampere University will act as chairman.

The dissertation is available online at