A5024768034- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Advanced MRI Techniques and Applications
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Advanced Frequency and Time Standards
- Magnetic Field Sensors Techniques
- Advanced NMR Techniques and Applications
- Geophysics and Sensor Technology
- Mechanical and Optical Resonators
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Laser Design and Applications
- Non-Invasive Vital Sign Monitoring
- Noncommutative and Quantum Gravity Theories
- Cardiac Arrhythmias and Treatments
- Cardiovascular Syncope and Autonomic Disorders
- Particle physics theoretical and experimental studies
- Advanced Measurement and Metrology Techniques
- Advanced Electrical Measurement Techniques
- EEG and Brain-Computer Interfaces
- Functional Brain Connectivity Studies
Paul Scherrer Institute
2016-2025
Physikalisch-Technische Bundesanstalt
2003-2017
Laboratoire de Physique Corpusculaire de Caen
2017
Institut National de Physique Nucléaire et de Physique des Particules
2017
École Nationale Supérieure d'Ingénieurs de Caen
2017
Centre National de la Recherche Scientifique
2017
Institute of Nuclear Physics, Polish Academy of Sciences
2017
KU Leuven
2017
Jagiellonian University
2017
Institute of Physics
2017
We present the result of an experiment to measure electric dipole moment (EDM) neutron at Paul Scherrer Institute using Ramsey's method separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in long history EDM experiments probing physics violating time reversal invariance. The salient features this were use a Hg-199 co-magnetometer and array optically pumped cesium vapor magnetometers cancel correct for field changes. statistical analysis was performed...
We present for the first time a detailed and comprehensive analysis of experimental results that set current world sensitivity limit on magnitude electric dipole moment (EDM) neutron. have extended enhanced our earlier to include recent developments in understanding effects gravity depolarizing ultracold neutrons (UCN); an improved calculation spectrum neutrons; conservative estimates other possible systematic errors, which are also shown be consistent with more measurements undertaken...
We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of spin-precession frequencies stored ultracold neutrons and 199Hg atoms an axion-induced oscillating electric dipole moment neutron axion-wind effect. No signal consistent with is observed axion mass range 10−24≤ma≤10−17 eV. Our null result sets first laboratory constraints coupling to gluons, which improve astrophysical limits up 3 orders magnitude, also improves previous nucleons factor 40.Received 29...
Abstract This article is designed as a step-by-step guide to optically pumped magnetometers based on alkali atomic vapor cells. We begin with general introduction magneto-optical response, well expected magnetometer performance merits and how they are affected by main sources of noise. followed brief comparison different realizations an overview current research, the aim helping readers identify most suitable type for specific applications. Next, we discuss some practical considerations...
We present a multichannel cardiac magnetic field imaging system built in Fribourg from optical double-resonance Cs vapor magnetometers. It consists of 25 individual sensors designed to record maps the beating human heart by simultaneous measurements on grid 19 points over chest. The is operated as an array second order gradiometers using sophisticated digitally controlled feedback loops.
We present a theoretical study of the spectra produced by optical--radio-frequency double resonance devices, in which resonant linearly polarized light is used optical pumping and detection processes. extend previous work presenting algebraic results are valid for atomic states with arbitrary angular momenta, rf intensities, geometries. The only restriction made assumption low intensity. discussed view their use magnetometers.
A clock comparison experiment, analyzing the ratio of spin precession frequencies stored ultracold neutrons and 199Hg atoms, is reported. No daily variation this could be found, from which set an upper limit on Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This first for free neutron. result also interpreted as a direct gravitational dipole moment neutron |gn| 0.3 eV/c2 m spin-dependent interaction with Sun. Analyzing Earth, based previous...
Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters the neutron and in searches new charge-parity-violating processes or exotic interactions beyond Standard Model particle physics. The most prominent example is search a permanent electric-dipole moment (nEDM). We have performed an experimental comparison leading UCN sources currently operating. used ``standard'' storage bottle with volume 32 liters, comparable size to nEDM experiments, which allows us compare...
It has been proposed that there could be a mirror copy of the standard model particles, restoring parity symmetry in weak interaction on global level. Oscillations between neutral particle, such as neutron, and its counterpart potentially answer various standing issues physics today. Astrophysical studies terrestrial experiments led by ultracold neutron storage measurements have investigated to mirror-neutron oscillations imposed constraints theoretical parameters. Recently, further analysis...
We present the design of a next-generation experiment, n2EDM, currently under construction at ultracold neutron source Paul Scherrer Institute (PSI) with aim carrying out high-precision search for an electric dipole moment neutron. The project builds on experience gained previous apparatus operated PSI until 2017, and is expected to deliver order magnitude better sensitivity provision further substantial improvements. An overview experimental method setup given, requirements are derived, its...
Abstract High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present recent achievements degaussing equilibrating magnetically shielded room (MSR) n2EDM experiment at Paul Scherrer Institute. final configuration that will be used after numerous studies. The optimized procedure results in a residual has been reduced by factor two. ultra-low is achieved with full magnetic-field-coil system, large vacuum vessel...
We present a coil system designed to generate highly uniform magnetic field for the n2EDM experiment at Paul Scherrer Institute. It consists of main B0 and set auxiliary coils mounted on cubic structure with side length 273cm , inside large magnetically shielded room (MSR). have assembled this characterized its performances mapping robot. The apparatus is able 1μT vertical relative root mean square deviation σ(Bz)/Bz=3×10-5 over volume interest, cylinder radius 40cm height 30cm . This level...
The magnetic field produced by the human heart carries valuable information for medical research, as well diagnostics and screening disease. We have developed an optical method that allows us to produce movies of temporal dynamics cardiomagnetic map. While such been generated before with help SQUIDmagnetometers, our technique operates at room temperature promises substantial economic advantages.
Optically pumped magnetometers (OPM) are a very promising alternative to the superconducting quantum interference devices (SQUIDs) used nowadays for Magnetic Field Imaging (MFI), new method of diagnosis based on measurement magnetic field human heart. We present first combining multichannel OPM-sensor with an existing MFI-system resulting in fully functional room temperature MFI-system.
We present a magnetometer based on optically pumped Cs atoms that measures the magnitude and direction of 1 μT magnetic field. Multiple circularly polarized laser beams were used to probe free spin precession atoms. The design was optimized for long-time stability achieves scalar resolution better than 300 fT integration times ranging from 80 ms 1000 s. best less reached with 1.6 6 able measure field 10 μrad s up 2000
While the international nEDM collaboration at Paul Scherrer Institut (PSI) took data in 2017 that covered a considerable fraction of parameter space claimed potential signals hypothetical neutron (n) to mirror-neutron (n′) transitions, it could not test all signal regions various mirror magnetic fields. Therefore, new study n−n′ oscillations using stored ultracold neutrons (UCNs) is underway PSI, considerably expanding reach fields (B′) and oscillation time constants (τnn′). The apparatus...
The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty 0.8 ppm. We employed apparatus where ultracold neutrons and mercury atoms are stored in same volume report result γn/γHg=3.8424574(30).
We report a new limit on possible short range spin-dependent interaction from the precise measurement of ratio Larmor precession frequencies stored ultracold neutrons and $^{199}$Hg atoms confined in same volume. The was performed $\sim$1$\mu$ T vertical magnetic holding field with apparatus searching for permanent electric dipole moment neutron at Paul Scherrer Institute. A coupling between freely precessing polarized spins unpolarized nucleons wall material can be investigated by tiny...
Magnetic-field uniformity is of the utmost importance in experiments to measure electric dipole moment neutron. A general parametrization magnetic field terms harmonic polynomial modes proposed, going beyond linear-gradients approximation. We review main undesirable effects nonuniformities: depolarization ultracold neutrons and Larmor frequency shifts mercury atoms. The theoretical predictions for these were verified by dedicated measurements with single-chamber neutron...
We present the magnetically shielded room (MSR) for n2EDM experiment at Paul Scherrer Institute which features an interior cubic volume with each side of length 2.92m, thus providing accessible space 25m3. The MSR has 87 openings up to 220mm diameter operate experimental apparatus inside, and intermediate between layers sensitive signal processing electronics. characterization measurements show a remanent magnetic field in central 1m3 below 100pT, 600pT entire inner volume, 4\,cm walls....
The Surrounding Field Compensation (SFC) system described in this work is installed around the four-layer Mu-metal magnetic shield of neutron electric dipole moment spectrometer located at Paul Scherrer Institute. SFC reduces DC component external field by a factor about 20. Within control volume approximately 2.5 m × 3 m, disturbances are attenuated factors 5–50 bandwidth from 10−3 Hz up to 0.5 Hz, which corresponds integration times longer than several hundreds seconds and represent...