E. N. Gazis
A5103571922- 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
- Neutrino Physics Research
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Ion-surface interactions and analysis
- Integrated Circuits and Semiconductor Failure Analysis
- advanced mathematical theories
- Black Holes and Theoretical Physics
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Advanced Data Storage Technologies
- Radiation Therapy and Dosimetry
- Electrostatic Discharge in Electronics
National Technical University of Athens
2016-2025
Government of Catalonia
2024
Institute of Accelerating Systems and Applications
2019-2024
A. Alikhanyan National Laboratory
2024
Atlas Scientific (United States)
2024
The University of Adelaide
2013-2023
University of California, Santa Cruz
2023
European Council
2021
The University of Texas at Arlington
2020
European Organization for Nuclear Research
2012-2019
Hypothetical low-mass particles, such as axions, provide a compelling explanation for the dark matter in universe. Such particles are expected to emerge abundantly from hot interior of stars. To test this prediction, CERN Axion Solar Telescope (CAST) uses 9 T refurbished Large Hadron Collider magnet directed towards Sun. In strong magnetic field, solar axions can be converted X-ray photons which recorded by detectors. 2013–2015 run, thanks low-background detectors and new telescope,...
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
Abstract CompactLight is a Design Study funded by the European Union under Horizon 2020 research and innovation funding programme, with Grant Agreement No. 777431. was conducted an International Collaboration of 23 international laboratories academic institutions, three private companies, five third parties. The project, which started in January 2018 duration 48 months, aimed to design innovative, compact, cost-effective hard X-ray FEL facility complemented soft source pave road for future...
In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in field of dark energy research, exploits both chameleon coupling to matter (βm) and photons (βγ) via Primakoff effect. By reducing X-ray detection threshold used axions from 1 keV 400 eV CAST became sensitive converted solar spectrum which peaks around 600 eV. Even though have not observed any excess above background, can provide 95% C.L. limit strength...
Abstract O-rings made from foam rubber are often used in sealing applications. Foam have low (macroscopic) elastic modulus $$E_0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>E</mml:mi> <mml:mn>0</mml:mn> </mml:msub> </mml:math> resulting a nominal contact pressure when squeezed against countersurface. In most cases the is covered by thin surface film with effective $$E_1 > E_0$$ <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>></mml:mo> </mml:mrow> . We show...
A ring imaging Cherenkov (RICH) detector system has been built and is now in full operation within the DELPHI experiment. Large data samples of Z/sup 0/ decays are being collected with good resolution on observed angles. Several studies using RICH have already performed limited samples. Disturbance caused by shrinkage polymeric construction materials migration radiator substance reported. These effects counteracted do not endanger quality data.< <ETX...
In the framework of NSW Micromegas Quadruplet production for LHC-ATLAS Upgrade phase I at CERN, their gas sealing is a crucial issue. For this reason, we studied feasibility based on topography analysis materials used contact with elastic rubber cord. work present obtained measurements by Atomic Force Spectroscopy relevant materials, FR4 and Kapton, data method determining roughness surfaces. Moreover, have introduced applied an extended version K-correlation model modelling power spectrum....
FLASH-radiotherapy (RT) presents great potential as an alternative to conventional radiotherapy methods in cancer treatment. In this paper, we focus on simulation studies for a linear particle accelerator injector design using the ASTRA code, which permits beam generation and tracking through electromagnetic fields. Space charge-dominated beams were selected with aim of providing optimized generated profile lattice minimized emittance. The main results electron ultra-high dose rate (UHDR)...
We report on a new search for solar chameleons with the CERN Axion Solar Telescope (CAST). A GridPix detector was used to soft X-ray photons in energy range from 200 eV 10 keV converted chameleons. No signiffcant excess over expected background has been observed data taken 2014 and 2015. set an improved limit chameleon photon coupling, $\beta_\gamma < 5.7\times10^{10}$ $1<\beta_\mathrm{m}<10^6$ at 95% C.L. improving our previous results by factor two first time reaching sensitivity below...
The H₂020 CompactLight Project (www. CompactLight.eu) aims at designing the next generation of compact X-rays Free-Electron Lasers, relying on very high gradient accelerating structures (X-band, 12 GHz), most advanced concepts for bright electron photo injectors, and innovative short-period undulators. Compared to existing facilities, proposed facility will benefit from a lower beam energy, due enhanced undulators performance, be significantly more compact, with smaller footprint, as...
We present a safety system designed to ensure human radiation protection and provide real-time guidance in extreme environmental conditions. This was developed tested the complex experimental infrastructure of ATLAS underground cavern at CERN, where personnel is crucial, especially during maintenance periods. Safety such environments challenging extremely important due high complexity working space, radioactivity, stress that people experience. The we propose consists three sub-systems: data...
CompactLight (XLS) is an International Collaboration of 24 partners and 5 third parties, funded by the European Union through Horizon 2020 Research Innovation Programme. The main goal project, which started in January 2018 with a duration 36 months, design hard X-ray FEL facility beyond today’s state art, using latest concepts for bright electron photo-injectors, high-gradient accelerating structures, innovative short-period undulators. specifications parameters future are driven demands...
Although they have not yet been detected, axions and axion-like particles (ALPs) continue to maintain the interest (even increasingly so) of rare-event searches community as viable candidates for Dark Matter Universe but also a solution several other puzzles astrophysics. Their property coupling photons has inspired different experimental methods their detection, one which is helioscope technique. The CERN Axion Solar Telescope (CAST) most sensitive built up date recently published part...
The status of the solar axion search with CERN Axion Solar Telescope (CAST) will be presented. Recent results obtained by use $^3$He as a buffer gas has allowed us to extend our sensitivity higher masses than previous measurements $^4$He. With about 1 h data taking at each 252 different pressure settings we have scanned mass range 0.39 eV$ \le m_{a} $ 0.64 eV. From absence an excess x rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g$_{aγ} 2.3\times...
With the luminosity increase by a factor ten envisaged at sLHC, background (photons, neutrons, ...) and event pile-up probability are expected to in proportion different experiments, especially forward regions as, for instance, chambers of ATLAS Muon Spectrometer. Detectors based on Micromegas principle could be good alternatives detector upgrade sLHC framework because spatial ( < 100 μm) time (few ns) resolutions, high-rate capability, radiation hardness, robustness possibility build large...