[Moller] novel high luminosity LHC collimation materials

[Jay Benesch]

https://journals.aps.org/prab/abstract/10.1103/PhysRevAccelBeams.21.031001

Thermostructural characterization and structural elastic property 
optimization of novel high luminosity LHC collimation materials at CERN
M. Borg, A. Bertarelli, F. Carra, P. Gradassi, J. Guardia-Valenzuela, M. 
Guinchard, G. Arnau Izquierdo, P. Mollicone, O. Sacristan-de-Frutos, and 
N. Sammut
Phys. Rev. Accel. Beams 21, 031001 – Published 5 March 2018

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.