D. Mchedlishvili
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View article: Proof-of-principle demonstration of a pilot bunch comagnetometer in a stored beam
Proof-of-principle demonstration of a pilot bunch comagnetometer in a stored beam Open
In polarization experiments at storage rings, one of the challenges is to maintain the spin-resonance condition of a radio-frequency spin rotator with the spin precessions of the orbiting particles. Time-dependent variations of the magneti…
View article: Maintaining a resonance condition of an rf spin rotator through a feedback loop in a storage ring
Maintaining a resonance condition of an rf spin rotator through a feedback loop in a storage ring Open
This paper presents the successful application of a phase-lock feedback system to maintain the resonance condition of a radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect to a 120 kHz spin precession in the Co…
View article: Maintaining a Resonance Condition of an RF Spin Rotator Through a Feedback Loop in a Storage Ring
Maintaining a Resonance Condition of an RF Spin Rotator Through a Feedback Loop in a Storage Ring Open
This paper presents the successful application of a phase-lock feedback system to maintain the resonance condition of a radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect to a 120 kHz spin precession in the Co…
View article: Spin decoherence and off-resonance behavior of radio-frequency-driven spin rotations in storage rings
Spin decoherence and off-resonance behavior of radio-frequency-driven spin rotations in storage rings Open
High-frequency driven resonant spin rotators are routinely used as standard instruments in polarization experiments in particle and nuclear physics. Maintaining the continuous exact parametric spin resonance condition of the equality of th…
View article: Spin decoherence and off-resonance behavior of radiofrequency-driven spin rotations in storage rings
Spin decoherence and off-resonance behavior of radiofrequency-driven spin rotations in storage rings Open
Radiofrequency-driven resonant spin rotators are routinely used as standard instruments in polarization experiments in particle and nuclear physics. Maintaining the continuous exact parametric spin-resonance condition of the equality of th…
View article: Pilot bunch and co-magnetometry of polarized particles stored in a ring
Pilot bunch and co-magnetometry of polarized particles stored in a ring Open
In polarization experiments at storage rings, one of the challenges is to maintain the spin-resonance condition of a radio-frequency spin rotator with the spin-precessions of the orbiting particles. Time-dependent variations of the magneti…
View article: First Search for Axionlike Particles in a Storage Ring Using a Polarized Deuteron Beam
First Search for Axionlike Particles in a Storage Ring Using a Polarized Deuteron Beam Open
Based on the notion that the local dark-matter field of axions or axionlike particles (ALPs) in our Galaxy induces oscillating couplings to the spins of nucleons and nuclei (via the electric dipole moment of the latter and/or the paramagne…
View article: First Search for Axion-Like Particles in a Storage Ring Using a Polarized Deuteron Beam
First Search for Axion-Like Particles in a Storage Ring Using a Polarized Deuteron Beam Open
Based on the notion that the local dark-matter field of axions or axion-like particles (ALPs) in our Galaxy induces oscillating couplings to the spins of nucleons and nuclei (via the electric dipole moment of the latter and/or the paramagn…
View article: First detection of collective oscillations of a stored deuteron beam with an amplitude close to the quantum limit
First detection of collective oscillations of a stored deuteron beam with an amplitude close to the quantum limit Open
We investigated coherent betatron oscillations of a deuteron beam in the storage ring cooler synchrotron and storage ring, excited by a detuned rf Wien filter (WF). The beam oscillations were detected by conventional beam position monitors…
View article: Collective oscillations of a stored deuteron beam close to the quantum limit
Collective oscillations of a stored deuteron beam close to the quantum limit Open
We investigated coherent betatron oscillations of a deuteron beam in the storage ring COSY, excited by a detuned radio-frequency Wien filter. These beam oscillations were detected by conventional beam position monitors, read out with lock-…
View article: Development of a Dedicated Precision Polarimeter for Charged Particle EDM searches at COSY
Development of a Dedicated Precision Polarimeter for Charged Particle EDM searches at COSY Open
The international JEDI (Jülich Electric Dipole moment Investigation) collaboration is preparing a first-ever direct measurement of the deuteron Electric Dipole Moment (EDM), using the COSY storage ring at Forschungszentrum Jülich (Germany)…
View article: A storage ring EDM polarimeter
A storage ring EDM polarimeter Open
The search for electric dipole moments (EDM) of elementary particles is one of the hot topic in contemporary particle physics. The method to measure charged particle EDMs (p,d) is to observe the time development of a polarized beam in a de…
View article: Measurement of deuteron carbon vector analyzing powers in the kinetic energy range 170-380 MeV
Measurement of deuteron carbon vector analyzing powers in the kinetic energy range 170-380 MeV Open
A measurement of vector analyzing powers in elastic deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY of Forschungszentrum Jülich, Germany. Seven kinetic beam energies between 170 and 380 MeV have been used. A ve…
View article: Beam-based alignment at the Cooler Synchrotron COSY as a prerequisite for an electric dipole moment measurement
Beam-based alignment at the Cooler Synchrotron COSY as a prerequisite for an electric dipole moment measurement Open
The Jülich Electric Dipole moment Investigation (JEDI) collaboration aims at a direct measurement of the Electric Dipole Moment (EDM) of protons and deuterons using a storage ring. The measurement is based on a polarization measurement. In…
View article: A new beam polarimeter at COSY to search for electric dipole moments of charged particles
A new beam polarimeter at COSY to search for electric dipole moments of charged particles Open
A calorimetric polarimeter based on inorganic LYSO scintillators is described. It has been designed for use in a storage ring to search for electric dipole moments (EDM) of charged particles such as the proton and deuteron. Its development…
View article: Storage Ring to Search for Electric Dipole Moments of Charged Particles -- Feasibility Study
Storage Ring to Search for Electric Dipole Moments of Charged Particles -- Feasibility Study Open
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 coul…
View article: Development of LYSO detector modules for a charge-particle EDM polarimeter
Development of LYSO detector modules for a charge-particle EDM polarimeter Open
The JEDI (Jülich Electric Dipole moment Investigations) collaboration carries out preparations, R&D and a first proof-of-principle measurement for the challenging project to measure permanent electric dipole moments of charged particles us…
View article: A new approach: LYSO based polarimetry for the EDM measurements
A new approach: LYSO based polarimetry for the EDM measurements Open
One of the fundamental questions of modern particle physics is the existence of finite electric dipole moments (EDM) of the hadrons. In case of charged particles, like protons and deuterons, the proposed method is the precise determination…
View article: Feasibility Study for an EDM Storage Ring
Feasibility Study for an EDM Storage Ring Open
This project exploits charged particles confined as a storage ring beam (proton, deuteron, possibly $^3$He) to search for an intrinsic electric dipole moment (EDM, $\vec d$) aligned along the particle spin axis. Statistical sensitivities c…
View article: Experimental and theoretical study of deuteron–proton elastic scattering for proton kinetic energies between T = 882.2 MeV and T = 918.3 MeV
Experimental and theoretical study of deuteron–proton elastic scattering for proton kinetic energies between T = 882.2 MeV and T = 918.3 MeV Open
New precise unpolarised differential cross sections of deuteron-proton\nelastic scattering have been measured at 16 different deuteron beam momenta\nbetween $p_d = 3120.17\\;\\textrm{MeV}/c$ and $p_d =3204.16\\;\\textrm{MeV}/c$ at\nthe COo…
View article: Polarimetry - from basics to precision
Polarimetry - from basics to precision Open
In all experiments involving polarized beams or/and targets, the determination of the degree of polarization by asymmetry measurements is of prime importance. Over the years, so-called analyzing powers were extracted, e.g., for various rea…
View article: Polarimetry concept based on heavy crystal hadron calorimeter
Polarimetry concept based on heavy crystal hadron calorimeter Open
In the ongoing JEDI (Jülich Electric Dipole moment Investigations) project, the essential point will be to measure a tiny beam polarization change over an extended period of time. The particle scarcity in the polarized deuteron or proton b…
View article: LYSO crystal testing for an EDM polarimeter
LYSO crystal testing for an EDM polarimeter Open
Four detector modules, built from three different LYSO crystals and two different types of light sensors (PMTs and SiPM arrays), have been tested with a deuteron beam from 100 MeV − 270 MeV at the COSY accelerator facility for the srEDM pr…
View article: Spin tune mapping as a novel tool to probe the spin dynamics in storage rings
Spin tune mapping as a novel tool to probe the spin dynamics in storage rings Open
Precision experiments, such as the search for electric dipole moments of charged particles using storage rings, demand for an understanding of the spin dynamics with unprecedented accuracy. The ultimate aim is to measure the electric dipol…
View article: Phase Locking the Spin Precession in a Storage Ring
Phase Locking the Spin Precession in a Storage Ring Open
This Letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97 GeV/c bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both …