Speaker
Radek Skoda
(Department of Energy Engineering)
Description
The paper deals with optimal electron beam heat distribution on the HELLCZa experiment calculating the flatness of the distribution of heat input and distribution of surface temperature of various samples. A computer program has been developed for balancing the heat flux in the construction materials of the sample. The first boundary condition for this calculation were primarily functions describing the process of heat input from the electron beam. The nature of this power is given power distribution beam via a Gaussian function and a screening step on the irradiated surface. The second boundary condition is the cooling of the material by the refrigerant cooling ducts. While the heat input from the electron beam is relatively flat, the distribution of subsurface cooling channels and the design of individual elements of the sample leads to significant distortions of the distribution of surface temperature of the sample material. Depending on the method of scanning and relative position of the beam to the cooling a complex problem of heat conduction emerges which must be solved numerically. The computer program solves the above problem and balances the given system of equations of heat conduction and can thus describe in detail the nature of the surface temperature of the sample at a temperature below its surface. The outputs are temperature profiles during heating, a comprehensive view of the temperature distribution in the sample and temperature profiles in selected areas below the surface of the sample. Due to good thermal conductivity of structural materials, low heat capacity and a sufficiently long time of irradiation we treated the task as stationary. As part of the solution the sample surfaces scanning by electron beam was optimized. Thus, an optimal route of the electron beam was suggested for the HELLCZa sample.
Co-authors
Jan Stepanek
(Department of Energy Engineering, Czech Technical University In Prague, Zikova 4, 166 36 Prague, Czech Republic)
Radek Skoda
(Department of Energy Engineering, Czech Technical University In Prague, Zikova 4, 166 36 Prague, Czech Republic)
