Resistivity Characterization of Molybdenum-Coated Graphite-Based Substrates for High-Luminosity LHC Collimators

Autor: Accettura, Carlotta, Amorim, David, Antipov, Sergey, Baris, Adrienn, Bertarelli, Alessandro, Biancacci, Nicolo, Calatroni, Sergio, Carra, Federico, Caspers, Fritz, Garcia-Tabares Valdivieso, Elisa, Guardia Valenzuela, Jorge, Kurtulus, Adnan, Mereghetti, Alessio, Metral, Elias, Redaelli, Stefano, Salvant, Benoit, Taborelli, Mauro, Vollenberg, Wilhelmus
Přispěvatelé: Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
beam stability
Physics::Instrumentation and Detectors
cavity
7. Clean energy
01 natural sciences
beam: coupling: impedance
eddy current
law.invention
molybdenum
Coating
law
CERN LHC Coll: upgrade
Materials Chemistry
MoGr
grain size
Large Hadron Collider
Luminosity (scattering theory)
graphite
collimator
Collimator
Surfaces and Interfaces
Surfaces
Coatings and Films
resistivity
SEM
LHC
collimators
performance
HL-LHC
safety
Materials science
[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph]
microstructure
engineering.material
collimator: design
Collimated light
FIB
Optics
four-probe
0103 physical sciences
surface
010306 general physics
Electrical impedance
010308 nuclear & particles physics
business.industry
carbon
beam: stability
Direct current
Accelerators and Storage Rings
lcsh:TA1-2040
impedance
engineering
Physics::Accelerator Physics
lcsh:Engineering (General). Civil engineering (General)
business
molybdenum coatings
Beam (structure)
Zdroj: Coatings
Coatings, 2020, 10 (4), pp.361. ⟨10.3390/coatings10040361⟩
Coatings, Vol 10, Iss 361, p 361 (2020)
Volume 10
Issue 4
DOI: 10.3390/coatings10040361⟩
Popis: The High-Luminosity Large Hadron Collider (HL-LHC) project aims at extending the operability of the LHC by another decade and increasing by more than a factor of ten the integrated luminosity that the LHC will have collected by the end of Run 3. This will require doubling the beam intensity and reducing the transverse beam size compared to those of the LHC design. The higher beam brightness poses new challenges for machine safety, due to the large energy of 700 MJ stored in the beams, and for beam stability, mainly due to the collimator contribution to the total LHC beam coupling impedance. A rich research program was therefore started to identify suitable materials and collimator designs, not only fulfilling impedance reduction requirements but also granting adequate beam-cleaning and robustness against failures. The use of thin molybdenum coatings on a molybdenum&ndash
graphite substrate has been identified as the most promising solution to meet both collimation and impedance requirements, and it is now the baseline choice of the HL-LHC project. In this work we present the main results of the coating characterization, in particular addressing the impact of coating microstructure on the electrical resistivity with different techniques, from Direct Current (DC) to GHz frequency range.
Databáze: OpenAIRE
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