Thermostructural characterization and structural elastic property optimization of novel high luminosity LHC collimation materials at CERN

Abstract

The CERN Large Hadron Collider is currently being upgraded to operate at a stored beam energy of 680 MJ through the High Luminosity upgrade. The LHC performance is dependent on the functionality of beam collimation systems, essential for safe beam cleaning and machine protection. A dedicated beam experiment at the CERN High Radiation to Materials facility is created under the HRMT-23 experimental campaign. This experiment investigates the behavior of three collimation jaws having novel composite absorbers made of copper diamond, molybdenum carbide graphite, and carbon fiber carbon, experiencing accidental scenarios involving the direct beam impact on the material. Material characterization is imperative for the design, execution, and analysis of such experiments. This paper presents new data and analysis of the thermostructural characteristics of some of the absorber materials commissioned within CERN facilities. In turn, characterized elastic properties are optimized through the development and implementation of a mixed numerical-experimental optimization technique.

Novel LHC collimator materials: High-energy Hadron beam impact tests and nondestructive postirradiation examination

“…Molybdenum carbides improve the bonding between graphite planes, thus reducing the anisotropy of the composite. A summary of the thermophysical properties is reported in Table 2, together with those of CuCD [10].…”

Performance of the Large Hadron Collider cleaning system during the squeeze: Simulations and measurements

“…However, the future physics program at 7 TeV and the higher intensities of HL-LHC [3,4] provide new challenges, so it is important that the performance is well understood and can be accurately simulated. The HL-LHC program includes upgrades to the collimation system such as new collimators, new jaw materials [5] and new embedded instrumentation [6].…”

Thermomechanical Characterisation of Copper Diamond and Benchmarking with the MultiMat Experiment

“…e impulse excitation technique test is a dynamic, nondestructive material characterisation technique which measures the resonant frequencies of a material, which are subsequently used to calculate the material's elastic constants at room temperature or at elevated temperatures [24]. e measurement consists of hitting the sample with a hammer and recording the induced vibration modes by means of a microphone.…”