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Reference : UMR8578-TIBMIN0-003
Workplace : ORSAY
Date of publication : Monday, December 03, 2018
Type of Contract : FTC Scientist
Contract Period : 36 months
Expected date of employment : 1 February 2019
Proportion of work : Full time
Remuneration : 2600 - 3000 euro
Desired level of education : PhD
Experience required : Indifferent
multi-physics model development; plasma the thermal models
Main tasks :
- derive the main équations describing the problem
- numerical model development
- results analysis
Secondary task :
- reporting / communications
- solid background in plasma physics and thermodynamics
- modeling of physical systems
- data processing
- communication written / oral
Material treatment by electron beams for several applications such as melting, welding or lithography is deeply revisited in the last years. It becomes necessary to numerically describe the complex physical phenomena occurring in this situation. The involved processes are very different, depending on the current level of the beam. The topics here focuses on the characterization of the interaction, using simulations, for very high power densities, up to 10^4 W.mm-2. The scope is to model the electron beam interaction with metal materials.
During the first stage of the project, it is necessary to model the electron absorption in the matter, bulk or powder, considering the subsequent phenomena induced by relativist electrons (> 50 KeV) for evaluating the penetration of the beam. The goal is to describe the electron transport in the matter, and their path towards the ground. The surface charge effect must be taken into account.
In the second stage, the work will focus on the thermodynamics of the superficial layers crossed by the beam. Hot spots produced by the electron beam could be localized, with a static or mobile beam. For very high power densities, the size of the melted area is to evaluate.
In the third step, this thermal model will be extended to other sources of energy (e.g. laser) and the results will be compared with the ones obtained for electron beams.
Constraints and risks
This work is part of a collaborative project between CNRS and industriel companies.
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