M. Taborelli
YOU?
Author Swipe
View article: Surface Finishing and Coatings for Accelerator Vacuum Applications
Surface Finishing and Coatings for Accelerator Vacuum Applications Open
The main applications and techniques of thin film coating and plating on vacuum components for particle accelerators are reviewed through significative examples.
View article: Characterising the Surface Resistance of Laser-Treated LHC Beam Screens with the Shielded Pair Method
Characterising the Surface Resistance of Laser-Treated LHC Beam Screens with the Shielded Pair Method Open
The presence of strong electron clouds in the quadrupole magnetic field regions of the Large Hadron Collider (LHC) leads to considerable heating that poses challenges for the cryogenic cooling system, and under certain conditions to proton…
View article: Selective laser processing of particle accelerator beam screen surfaces for electron cloud mitigation
Selective laser processing of particle accelerator beam screen surfaces for electron cloud mitigation Open
The material properties of laser-treated LHC beam screens with low SEY are examined to validate compatibility with the operation conditions of particle accelerators.
View article: Cleaning of laser-induced periodic surface structures on copper by gentle wet chemical processing
Cleaning of laser-induced periodic surface structures on copper by gentle wet chemical processing Open
•Cleaning of 365 nm LIPSS from debris of with microemulsions has been demonstrated.•Excellent debris and particles removal while maintaining the LIPSS pattern were found.•The cleaning mechanism is dominated of selective dissolution of nano…
View article: Study of selected mild steels for application in vacuum systems of future gravitational wave detectors
Study of selected mild steels for application in vacuum systems of future gravitational wave detectors Open
Next-generation gravitational wave detectors (GWDs) like the Cosmic Explorer and Einstein Telescope require extensive vacuum tubing, necessitating cost-effective materials. This study explores the viability of mild steel as an alternative …
View article: LHC Upgrades in preparation of Run 3
LHC Upgrades in preparation of Run 3 Open
The Large Hadron Collider (LHC) Long Shutdown 2 (2019–2021), following LHC Run 2, was primarily dedicated to the upgrade of the LHC Injectors but it included also a significant amount of activities aimed at consolidation of the LHC machine …
View article: Plasma Cleaning of Hydrocarbon and Carbon Contaminated Surfaces of Accelerator Components
Plasma Cleaning of Hydrocarbon and Carbon Contaminated Surfaces of Accelerator Components Open
To achieve the vacuum quality required for the operation of particle accelerators, the surface of the vacuum vessels must be clean from hydrocarbons. This is usually achieved by wet chemistry processes, e.g., degreasing chemical baths that…
View article: Irradiation Induced Aging of Epoxy Resins for Impregnation of Superconducting Magnet Coils
Irradiation Induced Aging of Epoxy Resins for Impregnation of Superconducting Magnet Coils Open
Understanding the effect of radiation on the functional properties of epoxy resins is crucial for their application in future particle accelerators like the Future Circular Collider (FCC). We compare the irradiation induced aging rates of …
View article: Picosecond pulsed 532 nm laser system for roughening and secondary electron yield reduction of inner surfaces of up to 15 m long tubes
Picosecond pulsed 532 nm laser system for roughening and secondary electron yield reduction of inner surfaces of up to 15 m long tubes Open
Laser-induced surface structuring is a promising method to suppress electron mulitpacting in the vacuum pipes of particle accelerators. Electrons are scattered inside the rough surface structure, resulting in a low Secondary Electron Yield…
View article: Amorphous carbon thin films: Mechanisms of hydrogen incorporation during magnetron sputtering and consequences for the secondary electron emission
Amorphous carbon thin films: Mechanisms of hydrogen incorporation during magnetron sputtering and consequences for the secondary electron emission Open
Amorphous carbon (a-C) films, having low secondary electron yield (SEY), are used at CERN to suppress electron multipacting in the beam pipes of particle accelerators. It was already demonstrated that hydrogen impurities increase the SEY o…
View article: Out of focus ultrafast processing of metals for reduced secondary electron yield
Out of focus ultrafast processing of metals for reduced secondary electron yield Open
We have demonstrated out-of-focus ultrafast pulsed laser processing of copper with a variable working distance, without the need for mechanical movement. This was achieved by employing a diffractive optical element. The method has been dem…
View article: Influence of wavelength and accumulated fluence at picosecond laser-induced surface roughening of copper on secondary electron yield
Influence of wavelength and accumulated fluence at picosecond laser-induced surface roughening of copper on secondary electron yield Open
Ultrashort-pulse laser processing of copper is performed in air to reduce the secondary electron yield (SEY). By UV (355 nm), green (532 nm), and IR (1064 nm) laser-light induced surface modification, this study investigates the influence …
View article: Origin and mitigation of the beam-induced surface modifications of the LHC beam screens
Origin and mitigation of the beam-induced surface modifications of the LHC beam screens Open
All over Run 2, the LHC beam-induced heat load on the cryogenic system exhibited a wide scattering along the ring. Studies ascribed the heat source to electron cloud build-up, indicating an unexpected high Secondary Electron Yield (SEY) of…
View article: Efficient Combination of Surface Texturing and Functional Coating for Very Low Secondary Electron Yield Surfaces and Rough Nonevaporable Getter Films
Efficient Combination of Surface Texturing and Functional Coating for Very Low Secondary Electron Yield Surfaces and Rough Nonevaporable Getter Films Open
The formation of a fissured copper surface by picosecond pulsed laser irradiation is combined with functional coatings consisting of Ti and amorphous carbon layers or a Ti–Zr–V compound film to fabricate surfaces with the maximum of the se…
View article: On the Use of Oxidation Induction Time as a Kinetic Parameter for Condition Monitoring and Lifetime Evaluation under Ionizing Radiation Environments
On the Use of Oxidation Induction Time as a Kinetic Parameter for Condition Monitoring and Lifetime Evaluation under Ionizing Radiation Environments Open
The durability of polymeric materials is closely linked to their degradation under specific operating conditions when different stressors—general or specific, such as high temperature, sunlight or ionizing radiation, solvents, or mechanica…
View article: Niobium thin film thickness profile tailoring on complex shape substrates using unbalanced biased High Power Impulse Magnetron Sputtering
Niobium thin film thickness profile tailoring on complex shape substrates using unbalanced biased High Power Impulse Magnetron Sputtering Open
The authors report in this paper the possibility to control the thickness profile of a thin film deposited by High\nPower Impulse Magnetron Sputtering (HiPIMS). It is shown that the combination between a HiPIMS discharge,\nan unbalanced ma…
View article: Enhanced radio-frequency performance of niobium films on copper substrates deposited by high power impulse magnetron sputtering
Enhanced radio-frequency performance of niobium films on copper substrates deposited by high power impulse magnetron sputtering Open
We present a study of radio frequency properties of niobium films deposited on copper by two different approaches based on High Power Impulse Magnetron Sputtering, namely with a DC voltage biased substrate and with bipolar target voltage. …
View article: Secondary electron yield engineering of copper surfaces by 532 nm ultrashort laser pulses
Secondary electron yield engineering of copper surfaces by 532 nm ultrashort laser pulses Open
Nanostructured surfaces exhibit outstanding properties and enable manifold industrial applications. In this study the laser surface processing of polycrystalline, flat copper surfaces by 532 nm picosecond laser irradiation for secondary el…
View article: Beam-induced surface modifications as a critical source of heat loads in the Large Hadron Collider
Beam-induced surface modifications as a critical source of heat loads in the Large Hadron Collider Open
Beam-induced heat loads on the cryogenic regions of the Large Hadron Collider (LHC) exhibit a wide and unexpected dispersion along the accelerator, with potential impact on the performance of its High-Luminosity upgrade. Studies related th…
View article: Electrodeposition of copper applied to the manufacture of seamless superconducting rf cavities
Electrodeposition of copper applied to the manufacture of seamless superconducting rf cavities Open
Niobium thin film coated copper superconducting radio frequency elliptical cavities have demonstrated for many years their strong potential as an alternative to bulk niobium cavities. The thin film lower performance at high rf field is oft…
View article: Amorphous Carbon Coating in SPS
Amorphous Carbon Coating in SPS Open
Within the LHC Injector Upgrade (LIU) project, the Super Proton Synchrotron (SPS) needs to be upgraded to inject into the LHC higher intensity and brighter 25-ns bunch spaced beams. To mitigate the Electron Multipacting (E.M.) phenomenon, …
View article: Beam-Induced Surface Modification of the LHC Beam Screens: The Reason for the High Heat Load in Some LHC Arcs?
Beam-Induced Surface Modification of the LHC Beam Screens: The Reason for the High Heat Load in Some LHC Arcs? Open
All over Run 2, the LHC beam-induced heat load exhibited a wide scattering along the ring. Studies ascribed the heat source to electron cloud build-up, indicating an unexpectedly high Secondary Electron Yield (SEY) of the beam screen surfa…
View article: New Generation CERN LHC Injection Dump - Assembly and Installation (TDIS)
New Generation CERN LHC Injection Dump - Assembly and Installation (TDIS) Open
During CERN’s LS2, several upgrades were performed to beam intercepting devices in the framework of the HL-LHC Project. Upgraded equipment includes two internal beam dumps (TDIS) intended for machine protection located at the injection poi…
View article: Energy-resolved secondary-electron emission of candidate beam screen materials for electron cloud mitigation at the Large Hadron Collider
Energy-resolved secondary-electron emission of candidate beam screen materials for electron cloud mitigation at the Large Hadron Collider Open
Energy-resolved secondary electron spectroscopy has been performed on air-exposed standard Cu samples and modified Cu surfaces that are tested and possibly applied to efficiently suppress electron cloud formation in the high-luminosity upg…
View article: Surface characterization of vacuum components extracted from LHC dipole magnet
Surface characterization of vacuum components extracted from LHC dipole magnet Open
Vacuum components of a dipole magnet exposed to the proton beam in the LHC at CERN were extracted from the LHC ring during the technical stop 2016 – 2017. Chemical analysis as well as Secondary Electron Yield (SEY) meas- urements were perf…
View article: Secondary electron yield of surfaces: what we know and what we still need to know
Secondary electron yield of surfaces: what we know and what we still need to know Open
The electron cloud phenomenon in particle accelerators is related to the secondary electron yield of the surfaces in line of sight of the beam. At present, advanced models to predict electron cloud through simulation codes are available an…
View article: Impact of deconditioning on the secondary electron yield of Cu surfaces in particle accelerators
Impact of deconditioning on the secondary electron yield of Cu surfaces in particle accelerators Open
Electron cloud is a critical phenomenon in particle accelerators operating with high intensity and positively charged beams, as it is responsible for beam instabilities, vacuum degradation, and heat load on cryogenic sections. Electron clo…
View article: Influence of ion-induced secondary electron emission parameters in PICMC plasma simulations with experimental validation in DC cylindrical diode and magnetron discharges
Influence of ion-induced secondary electron emission parameters in PICMC plasma simulations with experimental validation in DC cylindrical diode and magnetron discharges Open
Niobium thin films are used at CERN (European Organization for Nuclear Research) for coatings of superconducting radio-frequency (SRF) accelerating cavities. Numerical simulations can help to better understand the physical processes involv…
View article: Resistivity Characterization of Molybdenum-Coated Graphite-Based Substrates for High-Luminosity LHC Collimators
Resistivity Characterization of Molybdenum-Coated Graphite-Based Substrates for High-Luminosity LHC Collimators Open
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 …