TS Technical Seminar: Study of thermo-mechanical effects induced in solids by high energy particle beams: analytical and numerical methods

by Alessandro Dallocchio (Politecnico di Torino)

Wednesday 30 Jan 2008, 16:00 → 17:00 Europe/Zurich

AT Auditorium (CERN)

The study of thermo-mechanical phenomena induced in solids by high energy particle beams is of paramount importance for those devices like windows, targets, collimators and beam absorbers having direct interaction with particle beams. From a structural point of view these phenomena can be considered as a non-uniform energy deposition generating a temperature distribution that provokes thermal-stresses and, in some cases, thermally induced vibrations.
This complex problem was treated with two complementary approaches: analytical and numerical (FEM) methods.
An original analytical method was fully developed to quickly solve the thermo-structural case of a rapid beam impact for structures of simple geometry (essentially beams and plates of circular and rectangular cross-sections). This technique allows temperature distribution, quasi-static stresses and stress waves to be calculated.
The numerical approach is necessary for structures of complex geometry, multi-component systems with geometrical and material non-linearities.
The case of CNGS target rods and of the jaw assembly of the LHC collimators will be presented, showing the comparison between simulation results and experimental measurements.