R. Caravita
A5022687118- Atomic and Molecular Physics
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Advanced Frequency and Time Standards
- Quantum and Classical Electrodynamics
- Neutrino Physics Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Quantum Mechanics and Applications
- Advanced Chemical Physics Studies
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Graphene research and applications
- Nuclear physics research studies
- Cold Fusion and Nuclear Reactions
- COVID-19 Digital Contact Tracing
- Particle Accelerators and Free-Electron Lasers
- Data-Driven Disease Surveillance
- Magnetic confinement fusion research
- Pulsars and Gravitational Waves Research
Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications
2020-2025
University of Trento
2022-2025
European Organization for Nuclear Research
2014-2020
University of Genoa
2014-2019
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2015-2019
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2016-2017
Istituto Nazionale di Fisica Nucleare
2013-2016
University of Milan
2013-2014
Politecnico di Milano
2014
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
2014
Abstract Antihydrogen atoms with K or sub-K temperature are a powerful tool to precisely probe the validity of fundamental physics laws and design highly sensitive experiments needs antihydrogen controllable well defined conditions. We present here experimental results on production in pulsed mode which time when 90% produced is known an uncertainty ~250 ns. The source generated by charge-exchange reaction between Rydberg positronium atoms—produced via injection positron beam into...
We report on laser cooling of a large fraction positronium (Ps) in free flight by strongly saturating the 1^{3}S-2^{3}P transition with broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced magnetic and electric field-free environment. observe two different laser-induced effects. first effect an increase number atoms after time has spent long-lived 2^{3}P states. second one-dimensional Doppler Ps, reducing cloud's temperature from 380(20) to 170(20) K....
Abstract The precise measurement of forces is one way to obtain deep insight into the fundamental interactions present in nature. In context neutral antimatter, gravitational interaction high interest, potentially revealing new that violate weak equivalence principle. Here we report on a successful extension tool from atom optics—the moiré deflectometer—for acceleration slow antiprotons. setup consists two identical transmission gratings and spatially resolving emulsion detector for...
We demonstrate the laser excitation of $n=3$ state positronium (Ps) in vacuum. A combination a specially designed pulsed slow positron beam and high-efficiency converter target was used to produce Ps. Its annihilation recorded by single-shot lifetime spectroscopy. Pulsed level at wavelength $\ensuremath{\lambda}\ensuremath{\approx}205$ nm monitored via Ps photoionization induced second intense pulse $\ensuremath{\lambda}=1064$ nm. About 15% overall emitted into vacuum excited photoionized....
The antihydrogen formation by charge exchange between cold antiprotons and Rydberg positronium Ps is studied using the Classical Trajectory Monte Carlo (CTMC) method.
We describe a system designed to re-bunch positron pulses delivered by an accumulator supplied source and Surko-trap. Positron from the are magnetically guided in 0.085 T field injected into region free of magnetic fields through μ-metal terminator. Here positrons temporally compressed, electrostatically accelerated towards porous silicon target for production emission positronium vacuum. Positrons focused spot less than 4 mm FWTM bunches ∼8 ns FWHM. Emission vacuum is shown single shot...
Abstract A powerful and robust control system is a crucial, often neglected, pillar of any modern, complex physics experiment that requires the management multitude different devices their precise time synchronisation. The AEḡIS collaboration presents CIRCUS, novel, autonomous optimised for time-critical experiments such as those at CERN’s Antiproton Decelerator and, more broadly, in atomic quantum research. Its setup based on Sinara/ARTIQ TALOS, integrating ALPACA analysis pipeline, last...
The main goal of the AEgIS experiment at CERN is to test weak equivalence principle for antimatter. will measure free-fall an antihydrogen beam traversing a moir\'e deflectometer. determine gravitational acceleration g with initial relative accuracy 1% by using emulsion detector combined silicon micro-strip time flight. Nuclear emulsions can annihilation vertex atoms precision about 1 - 2 microns r.m.s. We present here results detectors operated in vacuum low energy antiprotons from...
Antihydrogen formation at AEgIS CERN leverages charge exchange between Rydberg positronium (Ps*) and antiprotons, with cross-sections scaling the Ps principal quantum number $n^4$ inversely relative velocity $𝑣^{−2}$. However, motional Stark effect mismatch antiprotons impose stringent constraints, limiting efficiency. Advances in transmission converters mitigate self-ionization losses improve alignment, promising a significant boost antihydrogen yield. This work evaluates cross-sections,...
The experimental demonstration of positronium laser cooling with stationary broadband pulses negative detuning is briefly described. Considerations on the limits current experiment and possible future developments follow. In particular, benefit positron remoderation, use a magnetic field, polarization, pulse shaping, coherent deceleration are shortly discussed.
Positronium in the $2^{\phantom{\rule{0.16em}{0ex}}3}\mathrm{S}$ metastable state exhibits a low electrical polarizability and long lifetime (1140 ns), making it promising candidate for interferometry experiments with neutral matter-antimatter system. In present work, positronium is produced, absence of an electric field, via spontaneous radiative decay from $3^{\phantom{\rule{0.16em}{0ex}}3}\mathrm{P}$ level populated 205-nm UV laser pulse. Thanks to short temporal length pulse, 1.5 ns full...
In this work we report on the systematic characterization of a rare-gas moderated magnetically-transported continuous positron beam based 22Na radioactive source. The was performed with three different solid moderators: Ne, Ar, and Kr. Each moderator deposited then thermal annealed at temperature ∼ 35 % 30 lower than melting point, respectively. Tests moderation/magnetic transport efficiency apparatus have shown maximum 1.8 10-3, 2.0 10-3 0.6 for Kr, average longitudinal kinetic energy...
Primary goal of the AEḡIS experiment is to precisely measure free fall antihydrogen within Earth’s gravitational field. To this end, cold (≈50 K) will traverse a two-grid moiré deflectometer before annihilating onto position-sensitive detector, which shall determine vertical position annihilation vertex relative grids with micrometric accuracy. Here, we introduce vertexing detector based on modified mobile camera sensor and experimentally demonstrate that it can antiproton annihilations...
Producing positronium (Ps) in the metastable $2^3\text{S}$ state is of interest for various applications fundamental physics. We report here about an experiment which Ps atoms are produced this long-lived by spontaneous radiative decay excited to $3^3\text{P}$ level manifold. The cloud excitation obtained with a UV laser pulse experimental vacuum chamber presence guiding magnetic field 25 mT and average electric 300 V/cm. indication production from novel analysis technique single-shot...
Abstract We describe a multi-step “rotating wall” compression of mixed cold antiproton–electron non-neutral plasma in 4.46 T Penning–Malmberg trap developed the context AEḡIS experiment at CERN. Such traps are routinely used for preparation antiprotons suitable antihydrogen production. A tenfold antiproton radius has been achieved, with minimum only 0.17 mm. experimental conditions necessary to perform such compression: minimizing tails electron density distribution is paramount ensure that...
We characterized the pulsed Rydberg-positronium production inside Antimatter Experiment: Gravity, Interferometry, Spectroscopy ($\mathrm{AE}\overline{\text{g}}\mathrm{IS}$) apparatus in view of antihydrogen formation by means a charge exchange reaction between cold antiprotons and slow atoms. Velocity measurements on positronium along two axes cryogenic environment ($\ensuremath{\approx}10\phantom{\rule{0.16em}{0ex}}\mathrm{K}$) $1\phantom{\rule{0.16em}{0ex}}\mathrm{T}$ magnetic field were...
The AEgIS Experiment is an international collaboration based at CERN whose aim to perform the first direct measurement of gravitational acceleration g antihydrogen in field Earth. Cold will be produced with a pulsed charge exchange reaction cylindrical Penning trap where antiprotons cooled 100mK. cold excited Rydberg state and subsequently formed into beam. deflection beam measured by using Moiré deflectometer gratings. After being approved late 2008, started taking data commissioning phase...
The goal of the AEIS experiment at Antiproton Decelerator (AD) CERN, is to measure directly Earth's gravitational acceleration on antimatter by measuring free fall a pulsed, cold antihydrogen beam. final position falling will be detected sensitive detector. This detector consist an active silicon part, where annihilations take place, followed emulsion part. Together, they allow achieve 1% precision measurement with about 600 reconstructed and time tagged annihilations.
Abstract Nanochanneled silicon targets with high positron/positronium (Ps) conversion rate and efficient Ps cooling were produced. Morphological parameters of the nanochannels, such as their diameter length, adjusted to get a large fraction thermalized at room temperature being emitted into vacuum. measurements conducted combining single-shot positron annihilation lifetime spectroscopy Doppler 1 3 S → 2 P transition. γ –3 ratio also performed estimate positron/Ps efficiency. In converter...
[Formula: see text] experiment's main goal is to measure the local gravitational acceleration of antihydrogen and thus perform a direct test weak equivalence principle with antimatter. In first phase experiment aim 1% relative precision. This paper presents production method description some components experiment, which are necessary for gravity measurement. Current status experimental apparatus presented recent commissioning results antiprotons outlined. conclusion we discuss short-term...