Experimental characterization of thin films and structures used in vacuum chamber for particle accelerators


Project no.: CERN-KTU-2020-1
Project website: https://en.ktu.edu/projects/experimental-characterization-of-thin-films-and-structures-used-in-vacuum-chamber-for-particle-accelerators/

Project description:

All the internal surfaces of the vacuum components of particle accelerators are coated with either amorphous carbon coatings or non-evaporable getters, which (due to reduced electronic emission and high vacuum) ensure efficient operation of the accelerators. These technologies are important not only for CERN, but also for all laboratories around the world that use high-energy particle accelerators. The aim of the project is to understand and elucidate the physical mechanisms that control (reduce) the secondary electron emission coefficient in thin films and structures used in the vacuum chamber of particle accelerators. Project objectives: 1. To investigate the correlation of the secondary electron emission coefficient of amorphous carbon films (DLC) with the optical properties; 2. To form DLC coatings on Kapton substrates and to investigate the properties of the formed coatings and the structures (DLC-Kapton structures used in secondary electron detectors); 3. To verify the potential of different surface periodic structures to reduce the secondary electron emission coefficient

Project funding:

Lithuanian Academy of Sciences

Project results:

The first objective will lead to a deeper understanding of the mechanism of secondary electron emission, and optical coating measurements could provide an efficient indirect method for assessing the secondary electron emission of amorphous carbon. The second project has validated the idea and further research in this area will allow statistical evaluation and the formulation of quantitative parameters for the planned method. The second task requires amorphous carbon coatings with controlled electrical conductivity, which are used as a functional element in two-electrode electron cloud detectors. Thus, the second and third problems will have a direct application in devices used for secondary electron emission measurements.

Period of project implementation: 2020-04-29 - 2020-12-31

Project coordinator: Kaunas University of Technology

Sigitas Tamulevičius

2020 - 2020

Institute of Materials Science