Objective
New generation telecommunication satellites involves a constantly increasing number of users, all requiring higher and higher bit rates in the same frequency multiplex. Increasing power levels are thus needed in order to fulfil these requirements, leading to higher risks of microwave discharge phenomena inside high power space RF hardware. In a vacuum environment, this electrical breakdown is due to an avalanche-like increase of the electron density in the RF device, caused by secondary electron emission, when electrons, accelerated to high energies by the electric field, hit the walls of the device. The consequence is a change of the electro-dynamical properties of the device, leading to increased noise levels, link budget degradation and even damage of the equipment.
The multipactor effect has been investigated both theoretically and experimentally during almost 70 years. However up to now the theory exploited mainly a model based on the approximation of spatially uniform rf field (the plane-parallel model). Evidently, this approximation is not quite good for many realistic systems. Specifically a considerable discrepancy has been found between the theoretical predictions made within the plane-parallel model and experimental data on the multipactor threshold inside irises which are commonly used in waveguide structures. Therefore there is an urgent need to develop advanced prediction tools for multipactor in systems with complicated geometry. A reliable solution of this problem requires a complex approach which combines analytical study, numerical simulations, and experimental investigations.
The work within the proposed project will involve all above- mentioned components in a study of multipactor in irises. Analytical estimates will be done using the concept of the Miller force which determines the average electron motion in non-uniform rf fields and also taking into account the random walk of the electron trajectories due to the spread of the electron emission velocities. The quasi-static approximation and the conformal mapping method will be used to calculate the rf field and to develop a simplified software for multipactor simulations in a single iris. A Monte-Carlo algorithm will be combined with a previously developed electromagnetic solver SEMA to simulate the multipactor inside a waveguide containing irises.
Finally analytical estimates and results of numerical simulations will be compared with results of detailed experimental investigations of the multipactor in the same systems. Additionally the project involves
- an experimental validation of the theory developed within the previous project for the multipactor inside cylindrical coaxial lines;
- a further development of this theory taking into account partial reflection of the rf signal due to mismatch in the transmission line;
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
This project has not yet been classified with EuroSciVoc.
Be the first one to suggest relevant scientific fields and help us improve our classification service
You need to log in or register to use this function
Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Data not available
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Data not available
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Data not available
Coordinator
GÖTEBORG
Sweden
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.