G. Cerchiari
A5020945021- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Dark Matter and Cosmic Phenomena
- Muon and positron interactions and applications
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Mechanical and Optical Resonators
- Advanced Frequency and Time Standards
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Mass Spectrometry Techniques and Applications
- Particle physics theoretical and experimental studies
- Quantum and Classical Electrodynamics
- Advanced Chemical Physics Studies
- Quantum Mechanics and Applications
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Force Microscopy Techniques and Applications
- Photonic and Optical Devices
- Ion-surface interactions and analysis
- Orbital Angular Momentum in Optics
- Quantum Chromodynamics and Particle Interactions
- Quantum Electrodynamics and Casimir Effect
- Optical properties and cooling technologies in crystalline materials
- Acoustic Wave Resonator Technologies
Universität Innsbruck
2020-2025
European Organization for Nuclear Research
2014-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2017-2024
Politecnico di Milano
2014-2024
Max Planck Institute for Nuclear Physics
2013-2020
Simon Fraser University
2020
Max Planck Society
2014-2016
Max Planck Innovation
2014-2015
Czech Technical University in Prague
2015
University of Milan
2011-2014
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....
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...
We propose an experimental setup for manipulating the spontaneous emission of trapped ions, based on a spatial light modulator. Anticipated novelties include potential to entangle more than two ions through single photon detection event and control visibility spatially distinguishable emitters. The can be adapted most existing ion traps commonly used in quantum technology.
We describe how the annihilation of antiprotons can be utilized to generate highly charged synthetic qubits in an ion-trap setup. identify qubit transitions hyperfine splitting Hydrogen-like atoms composed isomer and a single electron ground state. promising candidates isomers Y, Nb, Rh, In, Sb, for which transition lies infrared whose excited state level lifetime is hundreds milliseconds, suitable metrology applications.
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...
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...
The bound--bound transition from the $5{d}^{2}6{s}^{2}$ $^{3}{F}_{2}^{e}$ ground state to $5d6{s}^{2}6p$ $^{3}{D}_{1}^{o}$ excited in negative lanthanum has been proposed as a candidate for laser cooling, which not yet achieved ions. Anion cooling holds potential allow production of ultracold ensembles any negatively charged species. We have studied aforementioned beam La ions by high-resolution spectroscopy. center-of-gravity frequency was measured be 96.592 80(10) THz. Seven nine expected...
Experiments with antihydrogen (H[over ¯]) for a study of matter-antimatter symmetry and antimatter gravity require ultracold H[over ¯] to reach ultimate precision. A promising path towards antiatoms much colder than few kelvin involves the precooling antiprotons by laser-cooled anions. Because weak binding valence electron in anions-dominated polarization correlation effects-only candidate systems suitable transitions exist. We report on combination experimental theoretical studies fully...
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...
Interferometric methods for detecting the motion of a levitated nanoparticle provide route to quantum ground state, but such are currently limited by mode mismatch between reference beam and dipolar field scattered particle. Here we demonstrate self-interference method detect particle's that solves this problem. A Paul trap confines charged dielectric in high vacuum, mirror retro-reflects light. We measure with sensitivity 1.7×10^{-12} m/sqrt[Hz], corresponding detection efficiency 2.1%,...
We present an implementation of the analysis dynamic near field scattering (NFS) data using a graphics processing unit. introduce optimized management scheme thereby limiting number operations required. Overall, we reduce time from hours to minutes, for typical experimental conditions. Previously step in such experiments, is now comparable acquisition time. Our approach applicable various NFS methods, including shadowgraph, Schlieren and differential microscopy.
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...
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 autocorrelation function is a statistical tool that often combined with dynamic light scattering (DLS) techniques to investigate the dynamical behavior of scattered fluctuations in order measure, for example, diffusive transparent particles dispersed fluid. An alternative approach analysis DLS data has been proposed decades ago and consists calculating starting from difference signal at different times by using so-called structure function. proven be more robust than method terms noise...
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.