A5015388176- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Terahertz technology and applications
- Advanced Antenna and Metasurface Technologies
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Metamaterials and Metasurfaces Applications
- Microwave Engineering and Waveguides
- Microwave and Dielectric Measurement Techniques
- Advanced Surface Polishing Techniques
- Laser-induced spectroscopy and plasma
- Advanced X-ray Imaging Techniques
- Antenna Design and Analysis
- Laser Material Processing Techniques
- Crystallography and Radiation Phenomena
- Scientific Computing and Data Management
- Engineering Applied Research
- Modular Robots and Swarm Intelligence
- Particle physics theoretical and experimental studies
- Advanced Chemical Physics Studies
- Electromagnetic Simulation and Numerical Methods
- Superconducting and THz Device Technology
- Electrowetting and Microfluidic Technologies
- Experimental Learning in Engineering
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
1985-2025
Istituto Nazionale di Fisica Nucleare
2022-2024
University of Naples Federico II
2019-2020
European Organization for Nuclear Research
2018
The electron-cloud phenomenon is one cause of beam instabilities in high intensity positive particle accelerators. Among the proposed techniques to mitigate or control this detrimental effect, micro-/nano-geometrical modifications vacuum chamber surfaces are promising reduce number emitted secondary electrons. Femtosecond laser surface structuring readily allows fabrication Laser Induced Periodic Surface Structures (LIPSS) and utilized several fields, but has not yet been tested for electron...
Elettra 2.0 will be a fourth generation storage ring light source replacing the existing synchrotron. This article illustrates design strategies, physical investigations and technical choices to meet multiple sometimes conflicting requirements. These include make fully transversely coherent up 0.5 keV-photon energy, diversify type of experiments through very broad range photon energies, from infrared hard x-rays, maximize number beamlines in excess 2-times machine periodicity, able produce...
The accurate knowledge of the beam coupling impedance in particle accelerators is important order to address potential impedance-driven instabilities and for planning machine upgrades. While simple models exist various components (e.g., pipes, step transitions, collimators), they are often insufficient correctly describe overall with necessary precision. Numerical 3D simulations, such as those performed CST wakefield eigenmode solvers, typically used improve model accuracy accounting...
Free-Electron Lasers are a rapidly growing field for advanced science and applications, worldwide facilities intense generation, characterization usage becoming increasingly popular due to their peculiarities, including extremely bright, coherent, wide band tunable ultra-short pulses which not achievable with other techniques up now. In this review we give thorough survey of the latest advances in Laser-based generation detection methodologies then present main characteristics future THz/IR...
One of the main limitations for future high-performance accelerators operating with positively charged particles is formation an electron-cloud inside beam vacuum chamber, giving rise to instabilities. The Secondary Electron Yield (SEY) beam-facing surfaces gives a measure mechanism which drives this phenomenon. laser-induced periodic structure on Cu has been demonstrated as promising process reduce SEY. In view applications in chambers, we studied laser influence SEY 515 and 1030 nm...
In this work, we propose to design a liquid crystal–based modular and extendable platform of cutting-edge optical technologies for studying materials based on the analysis polarization wavefront light in wavelength range 10–50 μm, which is considered work even longer wavelengths range. This will be driven by future THz-FEL source TerRa@BriXSinO that produces high power radiation THz-range from 6 THz up 30 (Mid-/Far-IR). The lack infrastructures has been tackled fabricating geometric phase...
Abstract In many resonant structures the damping of parasitic or higher order modes is indispensable to guarantee a correct and stable performance. This particularly true in microwave region case cavities other systems operating accelerating structures, where mitigation spurious resonance effects mandatory achieve high quality particle beams. We present results on mode suppression real pillbox cavity by inserting properly designed pyramidal metamaterial that acts as light, small volume...
The electromagnetic characterisation of different materials for the inner wall coating beam pipes is a long-standing problem in accelerator physics, regardless purpose they are used for, since their presence may affect an unpredictable way coupling impedance and therefore machine performance. Moreover, particle accelerators storage rings new generation very short bunches might be required, extending far frequency exploration spectrum rendering more important to assess material response up...
Coatings play a crucial role in the functionality of vacuum chambers particle accelerators, serving dual goal by efficiently facilitating pumping and mitigating electron cloud effects. However, their impact on surface impedance chamber walls raises concerns, potentially affecting machine performance imposing limitations achievable energies currents. Therefore, an electromagnetic characterization is essential for comprehensive study accelerator structures, particularly context next-generation...
A multiphoton-ionization apparatus utilizing a time-of-flight mass spectrometer as detector of parent and fragment ions is described. Results for the multiphoton resonant ionization fragmentation benzene are presented together with an accurate numerical evaluation photoionization probability. The comparison between our experimental results offers possibility estimating value two-photon cross section from 1B2u excited state benzene, which not yet established.
Resistive-wall impedance constitutes a significant percentage of the total beam-coupling budget an accelerator. A number different reduction techniques have been proposed during years depending on specific applications, ranging from higher order modes damping to solutions entailing high electrical-conductivity coatings pipe. This article investigates use metamaterial-based absorbers for sensibly reducing or nearly canceling impedance. We design and fabricate subwavelength 2-D metallic...
The presentation will cover approaches and strategies of modeling implementing collective effects in modern simulation codes. We review some the general to numerically model beam dynamics circular accelerators. then look into ways with a focus on plainness, modularity flexibility, using example PyHEADTAIL framework, highlight advantages drawbacks emerging from this method. To ameliorate one main drawbacks, namely potential loss performance compared classical fully compiled codes, several...
This paper describes a reliable, handy, and inexpensive measurement system to characterize, in the sub-THz frequency range, coating materials used beam pipes of accelerators. The method is based on time domain measurements an electromagnetic wave passing through waveguide having thin central slab, where material deposited both sides. Two horn antennas are integrated sides device optimize signal collection detection. novel technique tested slabs coated with nonevaporable getter (NEG) allows...
The UA9 piezo-goniometer has been designed to guarantee micro-radians-accuracy angular positioning of a silicon crystal for collimation experiment in the LHC, and minimize impact on LHC beamcoupling impedance. This paper presents Finite Element Method (FEM) study device, both parking operational positions, evaluate its impedance budget. In addition, shielding contribution RF gaskets carefully evaluated, with objective assess consequences operation case their failure. A final word is drawn...
Following the significant impedance related issues that occurred during LHC Run 1, all involved equipment groups made an impressive effort to assess and reduce of their near-beam components. Concerning beam induced RF heating, many problems in 1 were linked unexpected non-conformities. Mitigations put place but new non-conformities are likely appear 2, this is why efficient monitoring alarms currently place. Besides, known limitations led increase bunch ength from ns 1.25 removed, which...
The accurate calculation of the beam coupling impedance for particle accelerators is necessary to carefully assess machine stability against impedance-driven collective effects. A first order evaluation often done by means analytical formulas and/or 2D numerical codes. infinite length approximation used simplify accelerator elements. This expected be a reasonable assumption devices whose greater than transverse dimension but may less segmented devices. In this work, we present application...
Abstract The accurate analysis of any possible source beam instability is mandatory for the design a new particle accelerator, especially high-current and ultra-low emittance synchrotrons. In specific case instabilities driven by coupling between charged electromagnetic field excited itself, corresponding effect estimated through impedance. modeling this essential to perform rigorous evaluation impedance budget able account all devices present in entire machine. To deal with problem, paper...
This paper addresses the design of beam position monitor (BPM) devices suitable for fourth-generation diffraction-limited X-ray storage rings. Detailed investigations electromagnetic (EM) phenomena occurring inside component under various working conditions are carried out by considering different BPM EM models defined their geometry and materials. Moving from a theoretical characterization common round geometry, rhomboidal structures studied through careful numerical analysis relying on...
The ANTHEM (Advanced Technologies for Human-centered Medicine) Radio-Frequency Quadrupole (RFQ) will employ eight coaxial power couplers, which be magnetically coupled to the device through a loop antenna. coupler design can support up 140 kW in continuous wave operation. This paper presents of cavity used high-power testing, with primary objectives both optimizing coupling between couplers and ensuring operations at designated operating frequency. Furthermore, encompasses thermal structural...
Many resonant structures in the microwave region need damping of parasitic or higher order modes to optimise their performance. In cavities other systems operating accelerating structures, for example, mitigation spurious resonance effects is indispensable achieve high quality particle beams. We present here a parametric study on absorption properties multilayered metamaterial having shape truncated pyramid be used as light, small volume damper cavity. Full wave simulations have been...
The electromagnetic characterization of coating materials is fundamental to build a reliable impedance model any accelerator. In particular, since the CLIC (Compact LInear Collider) necessitates bunches with short longitudinal length, full material surface needed at high frequencies in millimetric wave length and beyond. goal this paper develop measurement method characterize sub-THz frequency range. performed using time domain coherent THz spectrometer. based on attenuation signal passing...
In modern particle accelerators, satisfying the desired beam properties (high currents, high luminosities, etc.) increasingly implies limiting total coupling impedance, which depends on machine and parameters of circulating beams. A number different reduction techniques have been proposed during years depending specific applications, ranging from higher order modes (HOM) damping to solutions entailing electrical-conductivity coatings pipe. This paper investigates use metamaterial-based...