T. Vafeiadis
A5105826708- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Advanced Data Storage Technologies
- Black Holes and Theoretical Physics
- Solar and Space Plasma Dynamics
- Quantum Mechanics and Applications
- Mass Spectrometry Techniques and Applications
- Fault Detection and Control Systems
- Particle Accelerators and Free-Electron Lasers
- Big Data Technologies and Applications
- Digital Radiography and Breast Imaging
- Geophysics and Gravity Measurements
European Organization for Nuclear Research
2012-2025
Rutherford Appleton Laboratory
2023-2024
New York University
2024
A. Alikhanyan National Laboratory
2024
Institute of High Energy Physics
2024
Atlas Scientific (United States)
2024
The University of Adelaide
2022-2023
Argonne National Laboratory
2023
Max Planck Institute for Physics
2018
Max Planck Society
2018
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....
We propose, design and construct a variant of the conventional axion haloscope concept that could be competitive in search for dark matter axions masses decade 10–100 μeV. Theses are located somewhat above mass range which existing experiments have reached sensitivity to benchmark QCD models. Our consists an array small microwave cavities connected by rectangular irises, arrangement commonly used radio-frequency filters. The size unit cavity determines main resonant frequency, while...
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...
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...
MICROMEGAS detectors have been running in the CERN Axion Solar Telescope (CAST) experiment since 2002. The detector, constructed of low radioactivity materials, operated efficiently exploiting its good spatial and energy resolution detector as well time information contained pulse shape events. Last year Microbulk were installed achieving very background levels thanks to improved performances upgraded shielding. performance during 2008 data-taking recent studies will be presented.
Modern physics experiments are frequently very complex, relying on multiple simultaneous events to happen in order obtain the desired result. The experiment control system plays a central role orchestrating measurement setup: However, its development is often treated as secondary with respect hardware, importance becoming evident only during operational phase. Therefore, AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) collaboration has created framework for easily coding...
The last generation of micromegas, called microbulk, are ahead classical gas detectors (or even other kind micro-pattern detectors) in gain stability, efficiency (by operation at high pressure), simplicity, robustness, energy resolution, readout features and radiopurity. This makes them a competent solution the field Rare Event Searches, where low background is most appreciated feature detector. CAST (CERN Axion Solar Telescope) experiment best example their application X-rays range. In...
An X-ray detector based on the combination of an integrated Micromegas stage with a pixel chip has been built in order to be installed at CERN Axion Solar Telescope. Due its high granularity and spatial resolution this allows for topological background suppression along detection threshold below $1\,\text{keV}$. Tests CAST Detector Lab show detector's ability detect photons down energy as low $277\,\text{eV}$. The first data taken after installation experiment underline performance average...
The T-REX project aims at developing novel readout techniques for Time Projection Chambers experiments searching Rare Events. Micromegas detectors are a good option, because of their performance regarding low background levels, energy and time resolution, gain stability operation. In the present we will shortly refer to two particular cases, on one hand in CAST experiment other studies carried out within NEXT, neutrinoless double-beta decay experiment.
It has been previously advocated that the presence of daily and annual modulations axion flux on Earth's surface may dramatically change strategy searches. The arguments were based so-called Axion Quark Nugget (AQN) dark matter model which was originally put forward to explain similarity visible cosmological densities $\Omega_{\rm dark}\sim \Omega_{\rm visible}$. In this framework, population galactic axions with mass $ 10^{-6} {\rm eV}\lesssim m_a\lesssim 10^{-3}{\rm eV}$ velocity $\langle...
The primary goal of the AEgIS experiment is to precisely measure free fall antihydrogen within Earth's gravitational field. To this end, a cold ~50K beam has pass through two grids forming moir\'e deflectometer before annihilating onto position-sensitive detector, which shall determine vertical position annihilation vertex relative with micrometric accuracy. Here we introduce vertexing detector based on modified mobile camera sensor and experimentally demonstrate that it can antiproton...
We report on laser cooling of a large fraction positronium (Ps) in free-flight by strongly saturating the $1^3S$-$2^3P$ 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 $3^3P$ states. second one-dimensional Doppler Ps, reducing cloud's temperature from 380(20) K to 170(20) K....
The LHC at CERN plans to have a series of upgrades increase its instantaneous luminosity $7.5\times10^{34} \text{ cm}^{-2}\text{s}^{-1}$. drastically impacts the ATLAS trigger and readout data rates. inner-most station muon spectrometer, so-called Small Wheels, will be replaced with New Wheel (NSW) system, consisting Micromegas (MM) sTGC detectors, which is expected installed in underground cavern end 2021. With final MM quadruplets (modules) already produced from different construction...
Standard solar physics cannot account for the X-ray emission and other puzzles, most striking example being corona mystery. The temperature rise above non-flaring magnetized sunspots, while photosphere just underneath becomes cooler, makes this mystery more intriguing. paradoxical Sun is suggestive of some sort exotic solution, axions (only?) choice missing ingredient. We present atypical axion signatures, which depict with a rest mass max ~17 meV/c2. Then, has been decades overlooked...
The CERN Axion Solar Telescope (CAST) is searching for axions and other new particles like chameleons coupling to photons emerging from the Sun.Those are converted into soft X-ray in a high magnetic field.To enhance sensitivity physics beyond Standard Model it necessary cope with weak couplings low energies, thus requiring an efficient background discrimination as well detection threshold below 1 keV.A promising candidate future CAST detector InGrid based detector.This combines spatial...
Axion helioscopes search for solar axions by their conversion in x-rays the presence of high magnetic fields.The use low background x-ray detectors is an essential component contributing to sensitivity these searches.In this work, we review recent advances on Micromegas used CERN Solar Telescope (CAST) and proposed future International Observatory (IAXO).The actual setup CAST has achieved levels below 10 -6 keV -1 cm -2 s , a factor 100 lower than first generation detectors.This reduction...
CERN Axion Solar Telescope (CAST) experiment is searching for axions coming from the Sun. Inside transverse magnetic fields, can be converted into X-rays, which detected by X-ray detectors. The expected energy of signal in CAST 1-10 keV range. Low noise and low background detectors are necessary to increase sensitivity experiment. Micro Mesh Gaseous Structure (micromegas) have been used since beginning, providing good spatial resolution CAST's needs. has intensely studying micromegas develop...