A5040062102- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Plasma Diagnostics and Applications
- Superconducting and THz Device Technology
- Spacecraft and Cryogenic Technologies
- Computational Physics and Python Applications
- Ionosphere and magnetosphere dynamics
- Advanced Frequency and Time Standards
- Geomagnetism and Paleomagnetism Studies
- Advanced NMR Techniques and Applications
- Semiconductor materials and devices
- Astrophysics and Cosmic Phenomena
- Quantum Electrodynamics and Casimir Effect
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2014-2023
European Organization for Nuclear Research
2007-2009
Institut für Urheber- und Medienrecht
2008
Istituto Nazionale di Fisica Nucleare
1985-1997
Ludwig-Maximilians-Universität München
1983
Max Planck Institute for Nuclear Physics
1981
Forschungszentrum Jülich
1980
Vacuum magnetic birefringence was predicted long time ago and is still lacking a direct experimental confirmation. Several efforts are striving to reach this goal, the sequence of results promises success in next few years. This measurement generally accompanied by search for hypothetical light particles that couple two photons. The PVLAS experiment employs sensitive polarimeter based on high finesse Fabry–Perot cavity. In paper we report latest experiment. data analysed taking into account...
To account for the dark-matter content in our Universe, postinflationary scenarios predict QCD axion a mass range $(10--{10}^{3})\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$. Searches with haloscope experiments this require monitoring of resonant cavity modes frequency above 5 GHz, where several experimental limitations occur due to linear amplifiers, small volumes, and low quality factors copper cavities. In paper, we deal last issue, presenting result search galactic axions using based on...
A haloscope of the QUAX--$a\gamma$ experiment composed an oxygen-free high thermal conductivity-Cu cavity inside 8.1 T magnet and cooled to $\sim200$ mK is put in operation for search galactic axion with mass $m_a\simeq43~\mu\text{eV}$. The power emitted by resonant amplified a Josephson parametric amplifier whose noise fluctuations are at standard quantum limit. With data collected about 1 h frequency $\nu_c=10.40176$ GHz, reaches sensitivity necessary detection QCD-axion, setting $90\%$...
A ferromagnetic axion haloscope searches for dark matter in the form of axions by exploiting their interaction with electronic spins. It is composed an axion-to-electromagnetic field transducer coupled to a sensitive rf detector. The former photon-magnon hybrid system, and latter based on quantum-limited Josephson parametric amplifier. system consists ten 2.1 mm diameter yttrium iron garnet spheres single microwave cavity mode means static magnetic field. Our setup most spin magnetometer...
This paper describes the 25 year effort to measure vacuum magnetic birefringence and dichroism with PVLAS experiment. The experiment went through two main phases: first using a rotating superconducting magnet second permanent magnets. was not able reach predicted value from QED. Nonetheless has set current best limits on for field of Bext=2.5 T, namely, Δn(PVLAS)=(12±17)×10−23 |Δκ|(PVLAS)=(10±28)×10−23. uncertainty Δn(PVLAS) is about factor 7 above Δn(QED)=2.5×10−23 @ 2.5 T.
A haloscope of the QUAX--$a\ensuremath{\gamma}$ experiment, composed an high-$Q$ resonant cavity immersed in a 8 T magnet and cooled to $\ensuremath{\sim}4.5\text{ }\text{ }\mathrm{K}$ is operated search for galactic axions with mass ${m}_{a}\ensuremath{\simeq}42.8\text{ }\ensuremath{\mu}\mathrm{eV}$, not accessible other running experiments. The design hollow dielectric cylinders concentrically inserted OFHC Cu cavity, allowed us maintain loaded quality-factor...
Several groups are carrying out experiments to observe and measure vacuum magnetic birefringence, predicted by quantum electrodynamics (QED). We have started running the new PVLAS apparatus installed in Ferrara, Italy, measured a noise floor value for unitary field birefringence of $\mathrm{\ensuremath{\Delta}}{n}_{u}^{(\mathrm{vac})}=(4\ifmmode\pm\else\textpm\fi{}20)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}23}\text{ }\text{ }{\mathrm{T}}^{\ensuremath{-}2}$ (the error represents...
Axions, originally proposed to solve the strong CP problem of quantum chromodynamics, emerge now as leading candidates WISP dark matter. The rich phenomenology associated light and stable QCD axion can be described an effective magnetic field that experimentally investigated. For QUAX experiment, matter axions are searched by means their resonant interactions with electronic spins in a magnetized sample. In principle, axion-induced magnetization changes detected embedding sample rf cavity...
A traveling wave parametric amplifier has been integrated in the haloscope of QUAX experiment. search for dark matter axions performed with a high-$Q$ dielectric cavity immersed an 8 T magnetic field and read by detection chain having system noise temperature about 2.1 K at frequency 10.353 GHz. Scanning conducted varying using sapphire rods into cavity. At multiple operating frequencies, sensitivity instrument was level viable axion models.
We describe the principle and status of PVLAS experiment which is presently running at INFN section Ferrara, Italy, to detect magnetic birefringence vacuum. This related QED vacuum structure can be detected by measuring ellipticity acquired a linearly polarized light beam propagating through strong field. Such an effect predicted Euler-Heisenberg Lagrangian. The method also sensitive other hypothetical physical effects such as axion-like particles in general any fermion/boson millicharged...
The PVLAS collaboration is presently assembling a new apparatus (at the INFN section of Ferrara, Italy) to detect vacuum magnetic birefringence (VMB). VMB related structure QED and predicted by Euler-Heisenberg-Weisskopf effective Lagrangian. It can be detected measuring ellipticity acquired linearly polarised light beam propagating through strong field. Using very same optical technique it also possible search for hypothetical low-mass particles interacting with two photons, such as...
We report on the resonant Fabry Perot cavity of PVLAS (Polarization Vacuum with LASer) experiment operating at λ = 1064 nm a record decay time 2.7 ms, factor more than two larger any previously reported optical resonator. This corresponds to coherence length 8.1 · 10(5) m. The is 3.303 m, and resulting finesse 770,000.
The frequency band 1--15 GHz provides exciting prospects for resonant axion haloscopes as indicated by cosmological and astrophysical arguments. Among the challenges currently addressed to reach required sensitivity, development of high-quality factor cavities that tolerate multitesla fields plays a central role. We report three-dimensional resonator based on right-circular copper cavity with hollow cylinders confine higher-order modes around cylinder axis. Its effective volume at 10.3 is...
We describe the principle and status of PVLAS experiment which is being assembled at INFN Laboratori Nazionali di Legnaro (Legnaro, Padua, Italy) to look for coherent effects, related QED vacuum structure, on propagation a polarized light beam in strong magnetic field.
The hypothetical axion particle is an excellent cold dark matter candidate. Models predict mass of tens μeV (GHz frequency range). In principle, it possible to convert galactic axions into a monochromatic microwave signal or detect them with electron-spin flip. both cases, measure the resulting vanishing (P ≈ 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-23</sup> W), high-Q cavity needed, Q ~...
Aim of the QUAX (QUaerere AXion) proposal is to exploit interaction cosmological axions with spin electrons in a magnetized sample. Their effect equivalent application an oscillating rf field frequency and amplitude which are fixed by axion mass coupling constant, respectively. The receiver module detector consists samples Larmor resonance tuned polarizing static magnetic field. axion-equivalent produces oscillations total magnetization samples. To amplify such tiny field, pump at same...
A test setup able to accommodate dish shaped electrodes for gaps up /spl sim/20 cm is being used study large gap effects. This experiment, in connection with other authors' experiments, underlines the three more characteristic aspects of case: a voltage effect, current effect and gas effect. The difficulty energy dissipation by surface processes at increasing penetration depth deposit gives an interesting interpretative perspective behavior gap, HV devices.