A. Variola
A5088631434- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Crystallography and Radiation Phenomena
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Laser-Matter Interactions and Applications
- Radiation Therapy and Dosimetry
- Advanced Fiber Laser Technologies
- Photocathodes and Microchannel Plates
- Quantum, superfluid, helium dynamics
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Medical Imaging Techniques and Applications
- Magnetic confinement fusion research
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2025
Sofia University "St. Kliment Ohridski"
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2020-2024
Istituto Nazionale di Fisica Nucleare
2002-2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2011-2022
Université Paris-Sud
2010-2019
Institut National de Physique Nucléaire et de Physique des Particules
2002-2019
Centre National de la Recherche Scientifique
2010-2019
Université Paris-Saclay
2016-2019
Rome International Center for Materials Science
2018
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,...
The Polarized Electrons for Positrons experiment at the injector of Continuous Electron Beam Accelerator Facility has demonstrated first time efficient transfer polarization from electrons to positrons produced by polarized bremsstrahlung radiation induced a electron beam in high-Z target. Positron up 82% have been measured an initial momentum 8.19 MeV/c, limited only polarization. This technique extends positron capabilities GeV MeV beams, and opens access physics wide community.
We have developed a new method, based on the ballistic transfer of preaccumulated plasmas, to obtain large and dense positron plasmas in cryogenic environment. The method involves transferring emanating from region with low magnetic field (0.14 T) relatively high pressure (10(-9) mbar) into 15 K Penning-Malmberg trap immersed 3 T base better than 10(-13) mbar. achieved accumulation rate is more one half orders magnitude higher previous most efficient UHV compatible scheme. Subsequent...
ThomX is a compact x-ray source based on Compton scattering, installed at IJCLab (Laboratoire de physique des 2 infinis-Irène Joliot-Curie) in Orsay. The machine uses small electron storage ring and an intense laser pulse stored high-finesse optical cavity. This article describes the various subsystems of their initial results commissioning, which began mid-2021. first commissioning phase led to production <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the density and temperature. We discuss nondestructive measurements, based novel, real-time analysis excited, low-order modes, that provide comprehensive characterization in ATHENA apparatus. The length, radius, density, total particle number are obtained. Measurement control temperature variations, application to production experiments discussed.
Antihydrogen is formed when antiprotons are mixed with cold positrons in a nested Penning trap. We present experimental evidence, obtained using our antihydrogen annihilation detector, that the spatial distribution of emerging atoms independent positron temperature and axially enhanced. This indicates before thermal equilibrium plasma. result has important implications for trapping spectroscopy antihydrogen.
The machine described in this document is an advanced Source of up to 20 MeV Gamma Rays based on Compton back-scattering, i.e. collision intense high power laser beam and a brightness electron with maximum kinetic energy about 720 MeV. Fully equipped collimation characterization systems, order generate, form fully measure the physical characteristics produced Ray beam. quality, phase space density, two colliding beams will be such that emitted ray characterized by tunability, spectral...
A new kind of nonresonant optical recirculator, dedicated to the production $\ensuremath{\gamma}$ rays by means Compton backscattering, is described. This novel instrument, inspired multipass systems, has its design focused on high flux and very small spectral bandwidth $\ensuremath{\gamma}$-ray beam. It been developed fulfill project specifications European Extreme Light Infrastructure ``Nuclear Pillar,'' i.e., Gamma Beam System. Our system allows a single power laser pulse recirculate 32...
Abstract Positron sources are the key elements for future and current lepton collider projects such as ILC, CLIC, SuperKEKB, FCC-ee, Muon Collider/LEMMA, etc., introducing challenging critical requirements high intensity low emittance beams in order to achieve luminosity. In fact, due their large production constraints given by target thermal load, main parameters peak average current, emittances, damping time, repetition frequency consequently luminosity determined positron beam...
We show that antihydrogen production is the dominant process when mixing antiprotons and positrons in ATHENA apparatus, initial rate exceeds 300 Hz, decaying to 30 Hz within 10 s. A fraction of 65% all observed annihilations due antihydrogen.
A systematic study of the polarization x-gamma rays produced in Thomson and Compton scattering is presented, both classical quantum schemes. Numerical results analytical considerations let us to establish level as a function acceptance, bandwidth energy. Few sources have been considered: SPARC_LAB device, an example x-ray source, ELI-NP, operating gamma range. Then, typical parameters beam by plasma accelerator has analyzed. In first case, with bandwidths up 10%, contained reduction ($<10%$)...
Cold antihydrogen atoms were produced by mixing cold samples of antiprotons and positrons. The temperature the positron plasma was increased controlled radio-frequency (RF) heating, production measured. Formation is observed to decrease with but a simple power law scaling not observed. Significant still present at room temperature.
As part of the R&D toward production high flux polarised Gamma-rays we have designed and built a non-planar four-mirror optical cavity with finesse operated it at particle accelerator. We report on main challenges such cavity, as design suitable laser based fiber technology, mechanical difficulties having tunability stability in an accelerator environment active stabilization by implementing double feedback loop FPGA.
The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related production, cooling, accumulation and acceleration. In this paper layout positron driven source known as Low EMittance Muon Accelerator (LEMMA) concept is presented. beam, stored in ring with high energy acceptance low emittance, extracted multi-target system, produce pairs at threshold. This solution alleviates issues power deposited integrated Peak Energy Density Deposition...
The detection of electrostatic nonneutral plasma modes in the ATHENA (ApparaTus for High precision Experiment on Neutral Antimatter) experiment [M. Amoretti, C. Amsler, G. Bonomi et al., Nature (London) 419, 456 (2002)] is described. A complete nondestructive diagnostic based a fit to line shape function describing power transmitted through around frequency fundamental mode developed and experimental results are presented discussed.
Abstract During 2022 data taking (Run III) PADME searched for a resonant production and visible decay of the X17 particle into e + - . A precise knowledge within 1% uncertainty number positrons was required observation. To that purpose, an array 2 × 6 Timepix3 (total 512 1536 pixels) hybrid pixel detectors operated in data-streaming mode with ToA resolution 1.56 ns every employed. Two methods acquisition were developed. frame-based method, integrating hits each individual predefined period...
We demonstrate three-dimensional imaging of antiprotons in a Penning trap, by reconstructing annihilation vertices from the trajectories charged products. The unique capability antiparticle has allowed, for first time, observation spatial distribution particle loss trap. radial on trap wall is localized to small spots, strongly breaking azimuthal symmetry expected an ideal Our observations have important implications detection antihydrogen annihilations.Received 31 July...
We present evidence showing how antiprotonic hydrogen, the quasistable antiproton (p)-proton bound system, has been synthesized following interaction of antiprotons with molecular ion H2+ in a nested Penning trap environment. From careful analysis spatial distributions annihilation events, is presented for hydrogen production sub-eV kinetic energies states around n=70, and low angular momenta. The slow may be studied using laser spectroscopic techniques.
Antihydrogen can be synthesized by mixing antiprotons and positrons in a Penning trap environment. Here an experiment to stimulate the formation of antihydrogen n = 11 quantum state introduction light from CO2 continuous wave laser is described. An overall upper limit 0.8% with 90% C.L. on laser-induced enhancement recombination has been found. This result strongly suggests that radiative contributes negligibly formed experimental conditions used ATHENA Collaboration.
We demonstrate temporally controlled modulation of cold antihydrogen production by periodic RF heating a positron plasma during antiproton-positron mixing in Penning trap. Our observations have established pulsed source atomic antimatter, with rise time about 1 s, and pulse length ranging from 3 to 100 s. Time-sensitive detection diagnostics, both capabilities the ATHENA apparatus, allowed detailed studies pulsing behavior, which turn gave information on dependence process temperature T....