Numerical studies related to the design of the beam target of the energy amplifier prototype
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Data
1999
Autori
Maciocco, Luca
Bellucci, Valter
Buono, Stefano
Fotia, Giorgio
Moreau, Vincent
Mulas, Marco
Siddi, Giuliana
Sorrentino, Luca
Titolo del periodico
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Titolo del volume
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Abstract
The Centre for Advanced Studies, Research and Development in Sardinia (CRS4) is participating in
an Italian R&D program, together with Ansaldo, ENEA and INFN, devoted to the design of a 80
MW prototype of the Energy Amplifier proposed by C. Rubbia et al.. The use of advanced
numerical tools has been of practical support in the design of critical elements of the machine such
as the fuel element and the beam target.
The aim of this work is to show the design and optimization of the Liquid Metal Spallation
Target, which consists in an axial-symmetric vertical cylinder, where a Pb-Bi eutectic, in a natural
convection driven flow regime, works at the same time as spallation material and coolant for the
target and the beam window. The most critical part of the target is the window itself, where the
highest temperatures and thermal stresses are reached. The minimization of such temperatures and
stresses is the goal of the optimization.
The main geometrical dimensions of the target (i.e. beam pipe, beam window and external
container) are somehow fixed since they are related to the proton beam distribution and to the EA
core design. The optimization therefore acts on the suitable design of the flow guide which
separates the hot rising flow from the cold one. In the region where the flow is heated by the
proton beam the flow guide has a funnel shape which accelerates the liquid metal.
The numerical simulations are performed by using three different tools. The FLUKA Montecarlo
code is used to calculate the heat source distribution in the window and in the coolant generated by
the interaction with the proton beam. The results of these calculations are used as input data for the
thermal fluid dynamic simulations performed with the STAR-CD commercial software. The
resulting temperature and pressure fields are finally introduced in the NASTRAN code used for the
structural analysis of the solid components.
Descrizione
Keywords
beam target , liquid metal spallation target , numerical simulation , thermal fluid dynamics