TY  - JOUR
AU  - Cauchi, M.
AU  - Assmann, R. W.
AU  - Bertarelli, A.
AU  - Carra, F.
AU  - Cerutti, F.
AU  - Lari, L.
AU  - Redaelli, S.
AU  - Mollicone, P.
AU  - Sammut, N.
PY  - 2015
DA  - 2015//
TI  - Thermomechanical response of Large Hadron Collider collimators to proton and ion beam impacts
T2  - Phys. Rev. Spec. Top.-Accel. Beams
JO  - Physical Review Special Topics-Accelerators and Beams
SP  - 041002
EP  - 14pp
VL  - 18
IS  - 4
PB  - Amer Physical Soc
AB  - The CERN Large Hadron Collider (LHC) is designed to accelerate and bring into collision high-energy protons as well as heavy ions. Accidents involving direct beam impacts on collimators can happen in both cases. The LHC collimation system is designed to handle the demanding requirements of high-intensity proton beams. Although proton beams have 100 times higher beam power than the nominal LHC lead ion beams, specific problems might arise in case of ion losses due to different particle-collimator interaction mechanisms when compared to protons. This paper investigates and compares direct ion and proton beam impacts on collimators, in particular tertiary collimators (TCTs), made of the tungsten heavy alloy INERMET (R) 180. Recent measurements of the mechanical behavior of this alloy under static and dynamic loading conditions at different temperatures have been done and used for realistic estimates of the collimator response to beam impact. Using these new measurements, a numerical finite element method (FEM) approach is presented in this paper. Sequential fast-transient thermostructural analyses are performed in the elastic-plastic domain in order to evaluate and compare the thermomechanical response of TCTs in case of critical beam load cases involving proton and heavy ion beam impacts.
SN  - 1098-4402
UR  - https://doi.org/10.1103/PhysRevSTAB.18.041002
DO  - 10.1103/PhysRevSTAB.18.041002
LA  - English
N1  - WOS:000352473800001
ID  - Cauchi_etal2015
ER  -