A5103082410- Atomic and Subatomic Physics Research
- Stochastic processes and financial applications
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- Numerical methods in inverse problems
- Nuclear physics research studies
- Nonlinear Partial Differential Equations
- Advanced NMR Techniques and Applications
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Advanced Mathematical Modeling in Engineering
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Stability and Controllability of Differential Equations
- Quantum, superfluid, helium dynamics
- Statistical Mechanics and Entropy
- Markov Chains and Monte Carlo Methods
- Mathematical Analysis and Transform Methods
- Electron Spin Resonance Studies
- Mechanical and Optical Resonators
- Financial Risk and Volatility Modeling
- Magnetic properties of thin films
- Atomic and Molecular Physics
- Advanced Mathematical Physics Problems
- Advanced Harmonic Analysis Research
University of Bologna
2018-2024
Forschungszentrum Jülich
2020-2024
University of Ferrara
2012-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2015-2019
Tsukuba Medical Center Hospital
1996
A new experiment is described to detect a permanent electric dipole moment of the proton with sensitivity $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant are discussed and techniques address them presented. The measurement sensitive physics beyond Standard Model at scale 3000~TeV.
A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, tune-defined as number of precessions per turn-is given by ν(s)=γG (γ Lorentz factor, G gyromagnetic anomaly). At 970 MeV/c, deuteron spins coherently precess at a frequency ≈120 kHz in Cooler Synchrotron COSY. The deduced from up-down asymmetry deuteron-carbon scattering. time interval 2.6 s, was determined with precision order 10^{-8}, 1×10^{-10} for continuous 100 s accelerator cycle. This...
We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of magnetic storage ring (COSY). This long spin coherence time is maintained through combination bunching, electron cooling, sextupole field corrections, and suppression collective effects current limits. record required for search an intrinsic electric dipole moment on at statistical sensitivity level approaching 10^{-29} e cm.
This Letter reports the successful use of feedback from a spin polarization measurement to revolution frequency $0.97\text{ }\text{ }\mathrm{GeV}/c$ bunched and polarized deuteron beam in Cooler Synchrotron (COSY) storage ring order control both precession rate ($\ensuremath{\approx}121\text{ }\mathrm{kHz}$) phase horizontal component. Real time synchronization with radio (rf) solenoid made possible rotation out plane, yielding demonstration method manipulate polarization. In particular,...
This paper describes a time-marking system that enables measurement of the in-plane (horizontal) polarization 0.97-GeV/c deuteron beam circulating in Cooler Synchrotron (COSY) at Forschungszentrum J\"ulich. The clock time each polarimeter event is used to unfold 120-kHz spin precession and assign events bins according direction horizontal polarization. After accumulation for one or more seconds, down-up scattering asymmetry can be calculated matched sinusoidal function whose magnitude...
The stable spin direction of polarized particles in a storage ring was determined first experimentally, through an accurate measurement the tune and its response to longitudinal magnetic fields.
We propose a functional framework of fractional Sobolev spaces for class ultra-parabolic Kolmogorov type operators satisfying the weak H\"ormander condition. characterize these as real interpolation natural order intrinic recently introduced in [27], and prove continuous embeddings into $L^p$ intrinsic H\"older from [24]. These naturally extend standard Euclidean ones, coherently with homogeneous structure associated group. Our approach to is based on approximation intrinsically regular...
This paper presents the successful application of a phase-lock feedback system to maintain resonance condition radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect 120 kHz precession in Cooler Synchrotron (COSY) storage ring. Real-time monitoring and filter signal allows relative phase between two be stabilized at arbitrary setpoint. The compensates for deviations by adjusting and/or as needed. With this method, variation demand standard deviation...
The proposed method exploits charged particles confined as a storage ring beam (proton, deuteron, possibly $^3$He) to search for an intrinsic electric dipole moment (EDM) aligned along the particle spin axis. Statistical sensitivities could approach 10$^{-29}$ e$\cdot$cm. challenge will be reduce systematic errors similar levels. adjusted preserve polarisation, initially parallel velocity, times in excess of 15 minutes. Large radial fields, acting through EDM, rotate polarisation from...
We introduce intrinsic Sobolev-Slobodeckij spaces for a class of ultra-parabolic Kolmogorov type operators satisfying the weak Hörmander condition. prove continuous embeddings into Lorentz and Hölder spaces. also approximation interpolation inequalities by means an Taylor expansion, extending analogous results The embedding at first order is proved adapting method Luc Tartar which only exploits scaling properties quasi-norm, while higher orders we use uniform kernel estimates.
The paper describes the commissioning of experimental equipment and machine studies required for first spin-filtering experiment with protons at a beam kinetic energy 49.3 MeV in COSY. implementation low-$\ensuremath{\beta}$ insertion made it possible to achieve lifetimes ${\ensuremath{\tau}}_{b}=8000\text{ }\text{ }\mathrm{s}$ presence dense polarized hydrogen storage-cell target areal density...
The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. measurement allowed determination of spin-dependent polarizing cross section, that compares well theoretical prediction from nucleon–nucleon potential. test confirms can be adopted as method to polarize stored beam and present interpretation mechanism in terms proton–proton interaction is correct. outcome utmost importance view possible application antiprotons.
New measurements are reported for the time dependence of vertical polarization a $0.97\text{ }\text{ }\mathrm{GeV}/\mathrm{c}$ deuteron beam circulating in storage ring and perturbed by an rf solenoid. The is cooler synchrotron (COSY) located at Forschungszentrum J\"ulich. was measured continuously using 1.5 cm thick carbon target edge scintillators EDDA detector. An solenoid mounted on used to generate fields near frequency $1\ensuremath{-}G\ensuremath{\gamma}$ spin resonance. Measurements...
In this paper, we demonstrate the connection between a magnetic storage ring with additional sextupole fields set so that x and y chromaticities vanish maximizing of lifetime in-plane polarization (IPP) for 0.97-GeV/c deuteron beam. The IPP magnitude was measured by continuously monitoring down-up scattering asymmetry (sensitive to sideways polarization) in an in-beam, carbon-target polarimeter unfolding precession due anomaly deuteron. optimum operating conditions long were made scanning...
A low-energy spin-physics program is being developed at the COSY storage ring. To support planned experimental activities, several tools for polarized beams and targets have been developed. The paper presents physics case readiness of setup its realization.
We prove a real interpolation characterization for some non Euclidean Hölder spaces, built on the Lie structure induced by class of ultra-parabolic Kolmogorov-type operators satisfying Hörmander condition. As by-product we also obtain an approximation property intrinsically regular functions whole space.
This paper reports the first simultaneous measurement of horizontal and vertical components polarization vector in a storage ring under influence radio frequency (rf) solenoid. The experiments were performed at Cooler Synchrotron COSY J\"ulich using polarized, bunched $0.97\,\textrm{GeV/c}$ deuteron beam. Using new spin feedback system, we set initial phase difference between solenoid field precession to predefined value. system was then switched off, allowing change over time, on rotate...
The Jülich Electric Dipole moment Investigation (JEDI) collaboration aims at a direct measurement of the Moment (EDM) protons and deuterons using storage ring. is based on polarization measurement. In order to reach highest accuracy, one has know exact trajectory through magnets, especially quadrupoles, avoid influence magnetic fields vector. this paper, development beam-based alignment technique described that was developed implemented COoler SYnchrotron (COSY) Forschungszentrum Jülich....
We investigated coherent betatron oscillations of a deuteron beam in the storage ring cooler synchrotron and ring, excited by detuned rf Wien filter (WF). The were detected conventional position monitors. With currently available apparatus, we show that oscillation amplitudes down to $1\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ can be detected. interpretation response stored WF is based on simulations evolution lattice realistic time-dependent 3D field maps WF. Future measurements electric...