Dynamic Response of Advanced Materials Impacted by Particle Beams: The MultiMat Experiment

Michele Pasquali ,P Simon,A Bertarelli,Óscar Sacristán De Frutos ,Matthias Frankl ,Claudio Fichera ,Emilien Rigutto ,Philipp Bolz ,Fiona Harden ,Anton Lechner ,Pierluigi Mollicone ,Michael Guinchard ,Laura Bianchi ,Przemysław D Pastuszak ,Giorgia Gobbi ,Thomas A Furness ,Philippe Grosclaude ,Federico Carra ,Carlotta Accettura ,Emmanuel Berthomé ,Marcus Portelli ,M D Jedrychowsky,J Guardia-Valenzuela,Stefano Redaelli

doi:10.1007/s40870-019-00210-1

Abstract

The introduction at CERN of new extremely energetic particle accelerators, such as the high-luminosity large hadron collider (HL-LHC) or the proposed future circular collider (FCC), will increase the energy stored in the circulating particle beams by almost a factor of two (from 360 to 680 MJ) and of more than 20 (up to 8500 MJ), respectively. In this scenario, it is paramount to assess the dynamic thermomechanical response of materials presently used, or being developed for future use, in beam intercepting devices (such as collimators, targets, dumps, absorbers, spoilers, windows, etc.) exposed to potentially destructive events caused by the impact of energetic particle beams. For this reason, a new HiRadMat experiment, named “MultiMat”, was carried out in October 2017, with the goal of assessing the behaviour of samples exposed to high-intensity, high-energy proton pulses, made of a broad range of materials relevant for collimators and beam intercepting devices, thin-film coatings and advanced equipment. This paper describes the experiment and its main results, collected online thanks to an extensive acquisition system and after the irradiation by non-destructive examination, as well as the numerical simulations performed to benchmark experimental data and extend materials constitutive models.

Highlights

The LHC [1] is the largest and most energetic particle accelerator in the world, with two counter rotating proton beams with an energy of 360 MJ each, which are brought into headon collisions in four detectors.In the coming years, the energy stored in each of the two beams will be almost doubled to 680 MJ with the high luminosity LHC (HL-LHC) upgrade [2], aimed at substantially increasing the accelerator performances
It is paramount to assess the thermomechanical response of materials presently used, or being developed for future use, in those components that are inherently subjected to potentially destructive events caused by the impact of particle beams as targets, dumps, absorbers or collimators, usually called beam intercepting devices (BID) [4]
Modal analyses were performed prior to the tests to calculate the numerical flexural frequency of each sample, and the results showed that, theoretically, the system was close to an ideal configuration of simple supports at each end

Summary

Introduction

The LHC [1] is the largest and most energetic particle accelerator in the world, with two counter rotating proton beams with an energy of 360 MJ each, which are brought into headon collisions in four detectors.In the coming years, the energy stored in each of the two beams will be almost doubled to 680 MJ with the high luminosity LHC (HL-LHC) upgrade [2], aimed at substantially increasing the accelerator performances.

Results

Conclusion