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HiRadMat at CERN SPS – A test facility for Accelerator Components with High Power Beams
by Adrian Fabich (CERN, Switzerland)
HiRadMat is a facility constructed in 2011, designed to provide high-intensity pulsed beams to an irradiation area where different material samples or accelerator components can be tested. The facility, located at the CERN SPS accelerator complex, uses primarily a 440 GeV proton beam with a pulse length up to 7.2 micro-seconds and a maximum intensity up to 4e13 protons/pulse, but also ions like lead. The facility, a unique place for performing state-of-the art beam-to-material experiments, also operates under FP7 Transnational Access (EuCARD-2). HiRadMat, in operation since 2012, has hosted component tests in a large number of domains: collimators, detectors of beam (loss) and radiation monitoring, vacuum windows, high power targets. Overall there were more than 20 dedicated experimental runs. The usage is not limited to these topics and can be potentially extended e.g. to cryogenic elements for structural tests and beam induced quench tests. This seminar will show the facility operation for users and demonstrate the experimental possibilities within the HiRadMat facility showing examples of former experiments.
Particle-based Methods for Multiphase Systems and Applications to High Power Targets
by Roman Samulyak (Department of Applied Mathematics and Statistics, Stony Brook University, USA) - Computational Science Initiative, Brookhaven National Laboratory, USA)
A new Lagrangian particle (LP) method has been developed for solving equations for compressible fluids and granular flows. Particle methods have several advantages over grid-based ones for multiphase problems. The Lagrangian particle method significantly increased the robustness, accuracy, and convergence order of the current method of smooth particle hydrodynamics (SPH) that is known to be non-convergent due to inaccurate discretization of differential operators. The main contributions of our method are stable, higher order upwind schemes and accurate discretization of differential operators based on weighted least squares / generalized finite differences. In our recent work, the method has been generalized to new classes of problems. In particular, we employed a granular material closure model to enable simulations of granular flows, and proposed a new adaptive Particle-in-Cloud method, for obtaining optimal numerical solutions to the Vlasov-Poisson equation. The LP method and software have been applied to the simulations of high power targets for future accelerators. Simulations of liquid mercury targets performed for the muon collider / neutrino factory program and simulations of new experiments with powder targets will be discussed. We have obtained good experimental agreement of simulation on main target features such as surface dynamics, cavitation (for liquid targets), and fragmentation.
ATS Seminars Organisers: H. Burkhardt (BE), M. Modena (TE), T. Stora (EN)
Coffee / tea will be served after the seminar in room 30/7-012