F. Rathmann
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View article: Eliminating beam-induced depolarizing effects in the hydrogen jet target for high-precision proton beam polarimetry at the Electron-Ion Collider
Eliminating beam-induced depolarizing effects in the hydrogen jet target for high-precision proton beam polarimetry at the Electron-Ion Collider Open
We analyze beam-induced depolarizing effects in the hydrogen jet target (HJET) at the Relativistic Heavy Ion Collider (RHIC) that has been used for absolute hadron beam polarimetry and shall be employed at the Electron-Ion Collider (EIC). …
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: LHCspin: a Polarized Gas Target for LHC
LHCspin: a Polarized Gas Target for LHC Open
The goal of the LHCspin project is to develop innovative solutions for measuring the 3D structure of nucleons in high-energy polarized fixed-target collisions at LHC, exploring new processes and exploiting new probes in a unique, previousl…
View article: Compact beam position monitor using a segmented toroidal coil
Compact beam position monitor using a segmented toroidal coil Open
An inductive compact beam position monitor based on a segmented toroidal coil surrounding the charged particle beam has been investigated. It makes use of the induced voltages in the windings instead of the induced charge imbalance on capa…
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: Compact beam position monitor using a segmented toroidal coil
Compact beam position monitor using a segmented toroidal coil Open
A new, compact beam position monitor based on segmented a toroidal coil surrounding the charged particle beam has been investigated. It makes use of the induced voltages in the windings instead of the induced charge imbalance on capacitor …
View article: Beams of polarized hadrons at EIC: Action plan to address acute challenges
Beams of polarized hadrons at EIC: Action plan to address acute challenges Open
In the recent years, more and more groups in the field of polarization instrumentation and technology have disappeared, taking their expertise in the experimental technologies with them. When the RHIC was conceived, there were numerous exp…
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: Towards experiments with polarized beams and targets at the GSI/FAIR storage rings
Towards experiments with polarized beams and targets at the GSI/FAIR storage rings Open
The exploitation of polarization degrees of freedom of hadron beams and/or targets offers a wealth of observables that are not accessible with unpolarized particles.These observables can be used to test the conservation or violation of fun…
View article: Rogowski Beam Position Monitor
Rogowski Beam Position Monitor Open
The Jülich Electrical Dipole Moment Investigations (JEDI) Collaboration performed the first direct measurement of a charged hadron Electric Dipole Moment (EDM). These investigations were carried out using polarized deuteron beams at the CO…
View article: Quantum mechanical derivation of radio-frequency-driven coherent beam oscillations in storage rings
Quantum mechanical derivation of radio-frequency-driven coherent beam oscillations in storage rings Open
The study of the approach to the quantum ground state and the possibility to detect displacements of macroscopic bodies close to the quantum limit represent pressing challenges in modern physics. In the recent experiment of the JEDI Collab…
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: Quantum mechanics of radiofrequency-driven coherent beam oscillations in storage rings
Quantum mechanics of radiofrequency-driven coherent beam oscillations in storage rings Open
Precision searches for the electric dipole moment of protons in storage ring experiments call for beam-position monitoring in the picometer range. We present the relevant fully quantum mechanical derivation of radiofrequency-driven collect…
View article: Spin Physics at COSY (2021-2024 and beyond) -- Pathfinder investigations toward an EDM storage ring and Spin-for-FAIR
Spin Physics at COSY (2021-2024 and beyond) -- Pathfinder investigations toward an EDM storage ring and Spin-for-FAIR Open
The unique global feature of COSY is its ability to accelerate, store and manipulate polarized proton and deuteron beams. In the recent past, these beams have been used primarily for precision measurements, in particular in connection with…
View article: Search for a muon EDM using the frozen-spin technique
Search for a muon EDM using the frozen-spin technique Open
This letter of intent proposes an experiment to search for an electric dipole moment of the muon based on the frozen-spin technique. We intend to exploit the high electric field, $E=1{\rm GV/m}$, experienced in the rest frame of the muon w…
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: New approach to search for parity-even and parity-odd time-reversal violation beyond the Standard Model in a storage ring
New approach to search for parity-even and parity-odd time-reversal violation beyond the Standard Model in a storage ring Open
Time-reversal breaking and parity-conserving millistrong interactions,\nsuggested in 1965, still remain a viable mechanism of CP-violation beyond the\nStandard Model. One of its possible manifestations is the T-odd asymmetry in\nthe transm…
View article: The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY
The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY Open
The waveguide RF Wien filter is one of the key components of the JEDI project at the COoler SYnchrotron in Jülich. The driving circuit constitutes a fundamental part of the waveguide RF Wien filter. When running at the spin precession freq…
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: Spin dynamics investigations for the electric dipole moment experiment
Spin dynamics investigations for the electric dipole moment experiment Open
Precision experiments, such as the search for a deuteron electric dipole\nmoments using a storage rings like COSY, demand for an understanding of the\nspin dynamics with unprecedented accuracy. In such an enterprise, numerical\npredictions…
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…