A5050366942- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Neutrino Physics Research
- Magnetic confinement fusion research
- Computational Physics and Python Applications
- Quantum and electron transport phenomena
- Scientific Computing and Data Management
- Corporate Governance and Management
- Semantic Web and Ontologies
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- Geophysical and Geoelectrical Methods
- Mathematics, Computing, and Information Processing
- Magnetic properties of thin films
- X-ray Spectroscopy and Fluorescence Analysis
- Logic, Reasoning, and Knowledge
- Semiconductor Quantum Structures and Devices
RWTH Aachen University
2017-2024
Forschungszentrum Jülich
1994-2024
FIZ Karlsruhe – Leibniz Institute for Information Infrastructure
2016-2024
Leibniz University Hannover
2022
University of Basel
2015-2020
Deutsches Elektronen-Synchrotron DESY
2020
Institut für Nanophotonik
2020
Max Planck Society
2019
Max Planck Institute for Physics
2015-2019
Leibniz Association
2017
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.
Based on the notion that local dark-matter field of axions or axionlike particles (ALPs) in our Galaxy induces oscillating couplings to spins nucleons and nuclei (via electric dipole moment latter and/or paramagnetic axion-wind effect), we establish feasibility a new method search for ALPs storage rings. previous work allows us maintain in-plane polarization stored deuteron beam few hundred seconds, perform first proof-of-principle experiment at Cooler Synchrotron (COSY) scan momenta near...
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...
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,...
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.
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...
A search in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation for final states which contain only a single energetic photon has been performed at $\sqrt{s}=29$ GeV with the MAC detector PEP. The upper limit on an anomalous signal interpreted terms of mass limits supersymmetric particles under assumption radiative pair production either photons or neutrinos. For electron ($\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{e}$) this is ${m}_{\stackrel{\ifmmode \~{}\fi{}}{e}}>37$ GeV/${\mathit{c}}^{2}$ 90%...
Mathematical notation, i.e., the writing system used to communicate concepts in mathematics, encodes valuable information for a variety of search and retrieval systems. Yet, mathematical notations remain mostly unutilized by today's In this paper, we present first in-depth study on distributions notation two large scientific corpora: open access arXiv (2.5B objects) reviewing service pure applied mathematics zbMATH (61M objects). Our lays foundation future research projects corpora. Further,...
The energy-energy correlation cross section for hadrons produced in electron-positron annihilation at a center-of-mass energy of 29 GeV has been measured with the MAC detector SLAC. result is corrected effects resolution, acceptance, and initial-state radiation. two independent ways on same data sample: weights angles are obtained either from flow finely segmented total absorption calorimeters or momenta charged tracks central drift chamber. This procedure helps reduce systematic errors by...
Direct photon production in hadronic events from ${e}^{+}{e}^{\ensuremath{-}}$ annihilation has been studied at $\sqrt{s}=29$ GeV with use of the MAC detector PEP storage ring. A charge asymmetry $A=(\ensuremath{-}12.3\ifmmode\pm\else\textpm\fi{}3.5)%$ is observed final-state jets. The cross section and are good agreement predictions fractionally charged quark-parton model. Both total yield have used to determine values quark charges. Limits established for anomalous sources direct photons.
This contribution deals with H-modes significant heat exchange between electrons and ions, but which can still show large differences electron ion-temperatures especially inside half minor radius. These conditions are referred to as moderately collisional. A systematic study shows that an increasing fraction of heating increases the transport in ion channel mainly due dependence ITG dominated on ratio Te/Ti agreement modeling. The rotational shear plasmas under was so small it hardly...
l-Lysine is an essential amino acid of great importance for the pharmaceutical and nutrition industries mainly produced by fermentative conversion d-glucose. The technological bottleneck efficient process often development separation purification technologies as they can account 20–50% overall operation costs. Liquid-phase adsorption on zeolites energy-, resource-, cost-saving alternative. Zeolites are a well-established widely available class adsorbents. In this research, variety commercial...
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...
The transport of ballistic electrons emitted and detected by adjacent point contacts in a two-dimensional electron gas (2DEG) the system GaAs/${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As was measured at 1.2 K as function emitter current. Hot carriers with surplus energy up to 15 meV above Fermi level were generated current flow. It is shown that electron-electron scattering main limitation for quasiparticle lifetime. experimental data propagation from...
Azimuthal asymmetries play an important role in scattering processes with polarized particles. This paper introduces a new procedure using event weighting to extract these asymmetries. It is shown that the resulting estimator has several advantages terms of statistical accuracy, bias, assumptions on acceptance and luminosities compared other estimators discussed literature.
Abstract A measurement of vector analyzing powers in elastic deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY Forschungszentrum Jülich, Germany. Seven kinetic beam energies between 170 and 380 MeV have used. vector-polarized from a polarized deuteron source was injected, accelerated to final desired energy stored COSY. thin needle-shaped diamond strip used as carbon target, onto which slowly steered. Elastically scattered deuterons were identified forward...
A calorimetric polarimeter based on inorganic LYSO scintillators is described. It has been designed for use in a storage ring to search electric dipole moments (EDM) of charged particles such as the proton and deuteron. Its development first was Cooler Synchrotron (COSY) at Forschungszentrum Jülich with 0.97 GeV/c polarized deuterons, particle energy suitable an EDM search. The requires high efficiency, large analyzing power, stable operating characteristics. With typical beam momenta about...