A5110698878- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- CCD and CMOS Imaging Sensors
- Superconducting Materials and Applications
- Photocathodes and Microchannel Plates
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- High-Energy Particle Collisions Research
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- Molten salt chemistry and electrochemical processes
- Quantum Chromodynamics and Particle Interactions
- Chemical Reactions and Isotopes
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- Scientific Research and Discoveries
- Magnetic and Electromagnetic Effects
CEA Paris-Saclay
2015-2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
CEA Grenoble
2024
CEA Cadarache
2024
Université Paris-Saclay
2019-2024
CEA Paris-Saclay - Etablissement de Saclay
2009-2019
Imperial College London
2015
Doğuş University
2015
Acıbadem Adana Hospital
2015
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,...
In response to the 2013 Update of European Strategy for Particle Physics, Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This covers a highest-luminosity high-energy lepton collider (FCC-ee) and energy-frontier hadron (FCC-hh), which could, successively, be installed in same 100 km tunnel. The scientific capabilities integrated FCC programme would serve worldwide community throughout 21st century. also investigates LHC energy upgrade,...
We review the physics opportunities of Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. describe measurement capabilities each FCC component, addressing study electroweak, Higgs strong interactions, top quark flavour, as well phenomena beyond Standard Model. highlight synergy complementarity different colliders, which will contribute to a uniquely coherent ambitious research programme, providing an unmatchable combination precision sensitivity new physics.
In response to the 2013 Update of European Strategy for Particle Physics (EPPSU), Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC covered an energy-frontier hadron collider (FCC-hh), highest-luminosity high-energy lepton (FCC-ee), corresponding 100 km tunnel infrastructure, well physics opportunities these two colliders, and LHC, based on FCC-hh technology. This document constitutes third volume Conceptual Design Report,...
We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From absence of excess X-rays when magnet was pointing Sun, we set an upper limit on axion-photon coupling 8.8 x 10^{-11} GeV^{-1} at 95% CL m_a <~ 0.02 eV. This result is best experimental over a broad range axion masses and eV also supersedes previous derived from energy-loss arguments globular-cluster stars.
In response to the 2013 Update of European Strategy for Particle Physics (EPPSU), Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC covered an energy-frontier hadron collider (FCC-hh), highest-luminosity high-energy lepton (FCC-ee), corresponding 100 km tunnel infrastructure, well physics opportunities these two colliders, and LHC, based on FCC-hh technology. This document constitutes third volume Conceptual Design Report,...
Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by Primakoff process. In laboratory magnetic field ("axion helioscope"), they transformed into x-rays energies of few keV. Using decommissioned Large Hadron Collider test magnet, CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from analysis these data are presented here. No signal above background was observed, implying an upper limit to axion-photon coupling...
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
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...
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the range 0.64 eV ≲ ma 1.17 eV. This closes gap to cosmological hot dark matter limit and actually overlaps it. From absence of excess x rays when magnet was pointing Sun we set a typical upper on axion-photon coupling gaγ 3.3 × 10(-10) GeV(-1) at 95% C.L., exact value depending pressure setting. Future direct axion searches will focus increasing sensitivity smaller values gaγ, example by...
A bstract This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in Sun, with unprecedented sensitivity. BabyIAXO conceived test all subsystems (magnet, optics detectors) relevant scale final system thus serve as prototype IAXO, but same time fully-fledged physics reach itself, potential discovery....
A new type of radiation detector based on a spherical geometry is presented. The consists large gas volume with central electrode forming radial electric field. Charges deposited in the conversion drift to sensor where they are amplified and collected. We introduce small located at center acting as proportional amplification structure. It allows high gains be reached operates wide range pressures. Signal development absolute amplitude response consistent predictions. Sub-keV energy threshold...
The CERN Axion Solar Telescope (CAST) searches for $a\ensuremath{\rightarrow}\ensuremath{\gamma}$ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward Sun. Two parallel bores filled with helium adjustable pressure to match x-ray refractive mass ${m}_{\ensuremath{\gamma}}$ axion search ${m}_{a}$. After vacuum phase (2003--2004), which is optimal ${m}_{a}\ensuremath{\lesssim}0.02\text{ }\text{ }\mathrm{eV}$, we used $^{4}\mathrm{He}$ 2005--2007...
Abstract ATHENA has been designed as a general purpose detector capable of delivering the full scientific scope Electron-Ion Collider. Careful technology choices provide fine tracking and momentum resolution, high performance electromagnetic hadronic calorimetry, hadron identification over wide kinematic range, near-complete hermeticity. This article describes design its expected in most relevant physics channels. It includes an evaluation choices, technical challenges to realizing R&D...
A low-background Micromegas detector has been operating in the CAST experiment at CERN for search solar axions during first phase of (2002–2004). The detector, made out low radioactivity materials, operated efficiently and achieved a very high level background rejection (5 × 10−5 counts keV−1 cm−2 s−1) without shielding.
We have searched for 14.4 keV solar axions or more general axion-like particles (ALPs), that may be emitted in the M1 nuclear transition of 57Fe, by using axion-to-photon conversion CERN Axion Solar Telescope (CAST) with evacuated magnet bores (Phase I). From absence excess monoenergetic X-rays when was pointing to Sun, we set model-independent constraints on coupling constants pseudoscalar couple two photons and a nucleon gaγ|−1.19gaN0+gaN3| < 1.36 × 10−16 GeV−1 ma 0.03 eV at 95% confidence level.
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 The PICOSEC Micromegas (MM) detector is a precise timing gaseous consisting of Cherenkov radiator combined with photocathode and MM amplifying structure. A 100-channel prototype 10 × cm 2 active area equipped Cesium Iodide (CsI) demonstrated time resolution below σ = 18 ps. objective this work to improve the robustness aspects, i.e. integration resistive carbon-based photocathodes, while maintaining good resolution. prototypes have been tested in laboratory conditions successfully...
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching via their back conversion to x-ray photons in 9-T 10-m long magnet directed toward Sun. We report on an extended run with International Observatory pathfinder detector, doubling previous exposure time. detector was operated xenon-based gas mixture part of new run, providing technical insights future configurations. No counts...
Axion helioscopes aim at the detection of solar axions through their conversion into x-rays in laboratory magnetic fields. The use low background x-ray detectors is an essential component contributing to sensitivity these searches. Here we review recent advances on Micromegas used CERN Solar Telescope (CAST) and proposed for future International Observatory (IAXO). most setups CAST have achieved levels 1.5 × 10−6 keV−1 cm−2 s−1, a factor more than 100 lower ones obtained by first generation...