A5026987653- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- Muon and positron interactions and applications
- Advanced X-ray Imaging Techniques
- Electromagnetic Simulation and Numerical Methods
- Distributed and Parallel Computing Systems
- International Science and Diplomacy
- Laser-Plasma Interactions and Diagnostics
- Electromagnetic Compatibility and Measurements
- Medical Imaging Techniques and Applications
- Ionosphere and magnetosphere dynamics
- Power Line Communications and Noise
- Lightning and Electromagnetic Phenomena
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Twentieth Century Scientific Developments
- Computational Physics and Python Applications
- Physics of Superconductivity and Magnetism
- Radiation Therapy and Dosimetry
- Laser Design and Applications
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2014-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2018-2022
European Organization for Nuclear Research
2017-2022
Budker Institute of Nuclear Physics
2002-2020
Istituto Nazionale di Fisica Nucleare
2001-2020
National Agency for New Technologies, Energy and Sustainable Economic Development
2018
Frascati Scienza
2015
High Energy Accelerator Research Organization
2007
Sapienza University of Rome
1996
The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV measured properties compatible those Standard-Model Higgs boson, coupled absence discoveries phenomena beyond Standard Model at TeV scale, has triggered interest in ideas for future factories. A circular e+e- collider hosted 80 to 100 km tunnel, TLEP, is among most attractive solutions proposed so far. It clean experimental environment, produces high luminosity top-quark, W Z studies, accommodates multiple...
The electron-positron collider DAPhiNE, the Italian Phi factory, has been recently upgraded in order to implement an innovative collision scheme based on large crossing angle, small beam sizes at point, and compensation of beam-beam interaction by means sextupole pairs creating a "crab-waist" configuration region. Experimental tests novel exhibited increase factor 3 peak luminosity with respect performances reached before upgrade. In this Letter we present new scheme, discuss its advantages,...
Numerical simulations have shown that a recently proposed 'crabbed waist' scheme of beam-beam collisions can substantially increase the luminosity collider. In this paper we give qualitative explanation why works. For purpose use simple geometrical considerations and analyze peculiar properties vertical motion modulations by synchrotron horizontal betatron oscillations. It is in these modulations, which are main sources resonances excitation, significantly suppressed. Some numerical examples...
The Future Circular Collider study, which aims at designing post-LHC particle accelerator options, is entering in the final stage, foresees a conceptual design report containing basic requirements for hadron and lepton collider, as well options an electron-proton machine. Due to high beam intensities of these accelerators, collective effects have be carefully analyzed. Among them, finite conductivity vacuum chamber represents major source impedance electron-positron collider. By using...
We applied frequency map analysis (FMA)---a method that is widely used to explore dynamics of Hamiltonian systems---to study beam-beam effects in a novel crab waist collision approach. The ``crab'' focusing colliding beams results significant suppression betatron coupling resonances induced by interaction. Application FMA provides visible information about all working resonances, their widths, and locations the planes tunes amplitudes, so process due crabbing clearly seen. However, our...
Knowledge of the electromagnetic interaction between a beam and surrounding vacuum chamber is necessary in order to optimize accelerator performance terms stored current. Many instability phenomena may occur machine because fields produced by acting back on itself as feedback device. Basically, these produce an extra voltage energy gain, affecting longitudinal dynamics, transverse momentum kick which deflects beam. In this paper we describe main features with typical components.
The Future Circular Collider FCC-ee is a study toward high luminosity electron-positron collider with centre-of-mass energy from 91 GeV to 365 GeV. Due the beam parameters and pipe dimensions, collective effects electron cloud can be very critical aspects for machine represent main limitations its performance. An estimation of build up in components an impedance model are required analyze induced instabilities find solutions their mitigation. Special attention has been given resistive wall...
This report details the present status of Accelerator design for SuperB Project. It is one four separate progress reports that, taken collectively, describe made on Project since publication Conceptual Design Report in 2007 and Proceedings Workshop VI Valencia 2008.
For the past generation ${e}^{+}{e}^{\ensuremath{-}}$ storage ring colliders, we usually used natural bunch length or its impedance lengthened value in beam-beam simulations instead of considering directly. In future such as FCC-ee and CEPC, interaction becomes essentially three dimensional. order to increase luminosity, accelerators will collide very intense beams high energy with low emittances small beta functions at collision points exploiting crab waist scheme a large Piwinski angle....
The DAΦNE collider has been recently upgraded in order to implement a new collision scheme based on large Piwinski angle and cancellation of the synchro-betatron resonances by means electromagnetic sextupoles (Crab-Waist compensation). novel approach proved be effective improving beam-beam interaction luminosity. results measurements taken during commissioning as well perspectives for SIDDHARTA run are presented discussed.
Abstract Capacitive beam position monitors (BPM) are widely used as diagnostics tools in particle accelerators. Typically due to a large number of BPM an accelerator, their contribution the coupling impedance cannot be neglected. In addition broadband part at low frequencies, exhibits resonant peaks higher frequencies electromagnetic fields trapped around button and feedthrough assembly. Coupling these with spectrum lines can result overheating. this paper, we discuss design optimization...
Abstract Beam-beam interaction in FCC-ee can be seriously affected by the vacuum chamber coupling impedance resulting a safe tune areas reduction, shifts and spread, bunch length energy spread variation. The interplay of two effects has drastic impact on stability colliding bunches respectively achievable luminosity. In this paper, beam-beam collisions with 4 points are studied including updated transverse longitudinal impedances.
The effects of an electron cloud ($e$-cloud) on beam dynamics are one the major factors limiting performances high intensity positron, proton, and ion storage rings. In electron-positron collider DA\ensuremath{\Phi}NE, namely, a horizontal instability due to electron-cloud effect has been identified as main limitations maximum stored positron current source quality deterioration. During last machine shutdown in order mitigate such instability, special electrodes have inserted all dipole...
Abstract The FCC-ee impedance model is being constantly updated closely following the vacuum chamber design and parameters evolution. In particular, at present, a thicker NEG coating of 150 nm (instead previous 100 nm) has been suggested by experts, more realistic bellows investigated. Moreover, also transverse considering same sources as for longitudinal case. Therefore, database getting complete refined. this paper we describe presently available machine coupling in both planes, study...
A new concept of nonlinear focusing colliding bunches, called Crab Waist (CW)collision scheme, has been proposed at LNF INFN. It successfully tested the Italian lepton collider DAFNE in operational conditions providing luminosity for two different experimental detectors, SIDDHARTA and KLOE-2. Considering a high efficiency scheme increasing collision its relative simplicity implementation several projects have are under development present. These SuperKEKB B-factory ready to start...
The LHC collimation system is a critical element for the safe operation of machine. necessity fast accurate positioning collimator's jaws, recently introduced need to have button beam position monitors directly embedded in jaws extremities tertiary collimators and some secondary collimators. This addition led new design these including ferrites damp higher order modes instead rf fingers. In this work we will present impedance bench measurements simulations on TCT (Transverse Tertiary...
In this paper we derive the impedance of a circular hole in inner tube coaxial beam pipe. The method used differs from classic Bethe's diffraction theory, since, calculation magnetic and electric dipole moments, take into account also scattered fields aperture to match power conservation law. low-frequency shows real contribution accounting for TEM waves propagating within waveguide. \textcopyright{} 1996 American Physical Society.