A5003207464- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- High-Velocity Impact and Material Behavior
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- Electromagnetic Launch and Propulsion Technology
- Radiation Therapy and Dosimetry
- Gyrotron and Vacuum Electronics Research
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Structural Response to Dynamic Loads
- Fusion materials and technologies
- Advanced ceramic materials synthesis
- Nuclear and radioactivity studies
- Diamond and Carbon-based Materials Research
- Graphite, nuclear technology, radiation studies
- Ancient Mediterranean Archaeology and History
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Energy Harvesting in Wireless Networks
- Radiation Detection and Scintillator Technologies
- Tunneling and Rock Mechanics
- Photocathodes and Microchannel Plates
- Gamma-ray bursts and supernovae
- Material Selection and Properties
European Organization for Nuclear Research
2008-2024
University of Malta
2014
Polytechnic University of Turin
2008
Due to its flexibility in generating advanced field harmonic corrections and potential for low cost compared traditional designs, the Canted Cosine Theta (CCT) configuration is particularly interesting compact particle accelerators gantries medical applications. This paper presents design of a curved demonstrator named Fusillo, Nb-Ti dipole magnet that being developed at CERN, featuring large aperture 236 mm, small bending radius 1 m, angle 90 <inline-formula...
CERN's Linac4 45 kV H− ion sources prototypes are installed at a dedicated source test stand and in the tunnel. The operation of pulsed hydrogen injection, RF sustained plasma, high voltages described. first experimental results two relying on 2 MHz RF-plasma heating presented. plasma is ignited via capacitive coupling, by inductive coupling. light emitted from collected viewports pointing to chamber wall middle solenoid axis. Preliminary measurements optical emission spectroscopy photometry...
CERN’s 160 MeV H− linear accelerator (Linac4) is a key constituent of the injector chain upgrade Large Hadron Collider that being installed and commissioned. A cesiated surface ion source prototype tested has delivered beam intensity 45 mA within an emittance 0.3 π ⋅ mm mrad. The optimum ratio co-extracted electron- to ion-current below 1 best production efficiency, defined as current 2 MHz RF-power transmitted plasma, reached 1.1 mA/kW. first tests new optics, electron-dump, front end...
Two volume sources equipped with DESY and CERN plasma generators a low voltage electron dump were operated at 45 kV in the Linac4 tunnel on dedicated test stand. These delivered approximately 20 mA ensured commissioning of Radio Frequency Quadrupole accelerator first section Drift Tube Linac. CERN's prototype cesiated surface source this was continuously from November 2013 to April 2014 ion stand is being commissioned tunnel. Before cesiation, conditioned mode provided up 30 H− beam. Short...
The correct functioning of a collimation system is crucial to safely operate highly energetic particle accelerators, such as the Large Hadron Collider (LHC). requirements handle high intensity beams can be demanding. In this respect, investigating consequences LHC hitting tertiary collimators (TCTs) in experimental regions fundamental issue for machine protection. An test was designed investigate robustness and effects beam accidents on fully assembled collimator, based accident scenarios...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation J. Lettry, D. Aguglia, Y. Coutron, E. Chaudet, A. Dallocchio, Gil Flores, Hansen, Mahner, S. Mathot, Mattei, O. Midttun, P. Moyret, Nisbet, M. O'Neil, Paoluzzi, C. Pasquino, H. Pereira, Sanchez Arias, Schmitzer, R. Scrivens, Steyaert; H− ion sources for CERN's Linac4. AIP Conference Proceedings 8 February 2013;...
In view of High Luminosity LHC (HL-LHC) upgrades, collimator materials may become a limit to the machine performance: high RF impedance Carbon-Carbon composites used for primary and secondary collimators can lead beam instabilities, while Tungsten alloy adopted in tertiary exhibits low robustness case beam-induced accidents. An R&D program has been pursued develop new overcoming such limitations. Molybdenum-Graphite, addition its outstanding thermal conductivity, be coated with pure...
The functional specification of the LHC Collimators requires, for start-up machine and initial luminosity runs (Phase 1), a collimation system with maximum robustness against abnormal beam operating conditions. most severe cases to be considered in mechanical design are asynchronous dump at 7TeV 450GeV injection error. To ensure that collimator jaws survive such accident scenarios, low-Z materials were chosen, driving towards Graphite or Carbon reinforced composites. Furthermore, in-depth...
Linac4 cesiated surface H− sources are routinely operated for the commissioning of CERN's and on an ion source test stand. Stable current 40-50 mA achieved but transmission through LEBT 80% was below expectations triggered additional beam simulation characterization. The profile is not Gaussian emittance measurements larger than simulation. status ongoing development work described; 36 20 D− beams were produced with a 5.5 mm aperture source. emittances measured at stand presented. During...
Beam Intercepting Devices (BID) are designed to operate in a harsh radioactive environment and highly loaded from thermo-structural point of view. Moreover, modern particle accelerators, storing unprecedented energy, may be exposed severe accidental events triggered by direct beam impacts. In this context, impulse has been given the development novel materials for advanced thermal management with high shock resistance like metal-diamond metal-graphite composites on top refractory metals such...
A very fast temperature increase, produced by a nonuniform heat generation, induces in simply supported, isotropic, cylindrical rod both longitudinal and flexural vibrations. This paper presents an analytical method to study these vibrations determine the stresses they provoke. The proposed procedure relies on three main steps: exact solution for field is first obtained, means of Fourier–Bessel expansions; quasistatic thermal are then computed as function calculated distribution, making use...
Accidental events implying direct beam impacts on collimators are of the utmost importance as they may lead to serious limitations overall LHC Performance. In order assess damage threshold components impacted by high energy density beams, entailing changes phase and extreme pressures, state-of-the-art numerical simulation methods required. this paper, a review different dynamic response regimes induced particle beams is given along with an indication most suited tools treat each regime....
At present, the beam-based alignment of LHC collimators is performed by touching beam halo with both jaws each collimator. This method requires dedicated fills at low intensities that are done infrequently and makes this procedure time consuming. limits operational flexibility, in particular case changes optics orbit configuration experimental regions. The performance collimation system relies on machine reproducibility regular loss maps to validate settings collimator jaws. To overcome...