Beam-based alignment at the Cooler Synchrotron COSY as a prerequisite for an electric dipole moment measurement

Wagner, Tim; Nass, A.; Pretz, J.; Abusaif, F.; Aggarwal, A.; Andrés, A. de; Bekman, I.; Canale, N.; Ciepał, I.; Ciullo, G.; Dahmen, F.; Dymov, S.; Ehrlich, Christian; Gebel, R.; Grigoryev, K.; Grzonka, D.; Hejny, V.; Hetzel, J.; Kacharava, A.; Kamerdzhiev, V.; Karanth, S.; Keshelashvili, I.; Kononov, A. N.; Kulikov, A.; Laihem, K.; Lehrach, A.; Lenisa, P.; Lomidze, N.; Magiera, A.; Mchedlishvili, D.; Müller, Fabian; Николаев, Н. Н.; Pesce, A.; Poncza, V.; Rathmann, F.; Retzlaff, M.; Saleev, A.; Schmühl, M.; Shergelashvili, D.; Shmakova, V.; Slim, J.; Stahl, A.; Stephenson, E. J.; Ströher, H.; Tabidze, M.; Tagliente, G.; Talman, R.; Uzikov, Yu. N.; Valdau, Yu.; Wrońska, A.

doi:10.1088/1748-0221/16/02/t02001

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…The calculations were performed for EDM values of D = 0, 10 −20 , 10 −19 , 5 × 10 −19 10 −18 e • cm for each misalignments setting. Additionally, similar calculations were performed for quadrupole magnet misalignments (only translation in all directions) being measured recently by the Vermessungsbüro Stollenwerk & Burghof [33]. These results for Fourier amplitudes are presented in table 2 for few EDM values.…”

Section: Determination Of the Edm Limit By Fourier Analysismentioning

confidence: 81%

“…In addition to this orbit correction, a beam-based alignment procedure [32,33] enabling to align all 56 magnetic centers of the quadrupole magnets with the use of the 31 BPM's was recently performed at COSY. With this procedure, the beam was aligned with respect to the centre of the quadrupole magnets with a precision of 40 μm, while the quadrupole magnets are aligned to a precision of 200 μm to the design beam axis.…”

Section: Orbit Correctionmentioning

confidence: 99%

“…Fourier amplitudes for frequencies ω s and ω o − ω s and for selected EDM values. The measured COSY quadrupole magnets misalignments[33] were used and an orbit correction was applied.…”

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confidence: 99%

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Method to evaluate systematic uncertainties due to magnet misalignments in electric dipole moment measurements using a storage ring

Magiera¹,

Aggarwal²,

Poncza³

2021

J. Phys. G: Nucl. Part. Phys.

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Various scenarios of measurements of Electric Dipole Moment (EDM) of light hadrons with the use of a storage ring were proposed. Most of these methods are based on the measurement of the vertical spin component for an initially horizontal polarized beam. Since the expected EDM effect is very small, one has to payattention to various sources of systematic uncertainties. One of the most important sources are misalignments of the magnets forming the storage ring lattice, which may produce an effect that mimics an EDM. This false signal could be much larger than the expected EDM signal, even for very small magnet misalignments. This paper describes a novel method for the determination of the contribution of magnets misalignments to the expected EDM signal. It is shown that the magnitude of this effect could be estimated via a Fourier analysis of the time-dependent vertical polarization. This could be achieved by sampling the vertical polarization with a frequency larger than the beam revolution frequency, which corresponds to polarization measurements in at least two positions in the storage ring. The presented method can be applied to any scenario proposed for EDM measurements using a storage ring.

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Section: Determination Of the Edm Limit By Fourier Analysismentioning

confidence: 81%

Section: Orbit Correctionmentioning

confidence: 99%

See 1 more Smart Citation

Method to evaluate systematic uncertainties due to magnet misalignments in electric dipole moment measurements using a storage ring

Magiera¹,

Aggarwal²,

Poncza³

2021

J. Phys. G: Nucl. Part. Phys.

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“…• beam based alignment to ensure a passage of the orbit through the center of the quadrupole magnets has been realized [342].…”

Section: Main Results Of Jedi Collaboration and Protonmentioning

confidence: 99%

General relativity effects in precision spin experimental tests of fundamental symmetries

Vergeles,

Nikolaev,

Obukhov

et al. 2022

Preprint

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A search for the P -and CP (T )-violating electric dipole moments (EDM) of atoms, particles and nuclei with sensitivity up to 10 −15 in units of the magnetic dipole moments, allowed by all discrete symmetries, is one of the topical problems of modern physics. According to Sakharov, CP -violation is one of the three key criteria of the baryogenesis in the generally accepted paradigm of the Big Bang cosmology. All three criteria are supported by the Standard Model, but it fails to describe quantitatively the observed baryon asymmetry of the Universe. This is regarded a strong argument in favor of the existence of CP -symmetry breaking mechanisms beyond the minimal Standard Model, which can lead to a measurable EDMs of atoms, particles and nuclei. Searches for the EDM via the spin rotation in electric fields are currently underway in dozens of laboratories worldwide. Direct searches for EDM of charged particles and nuclei are possible only in storage rings (COSY, NICA). After successful studies by the JEDI collaboration at the COSY synchrotron, at the forefront in the field is a search for the proton EDM in an electrostatic storage ring with the proton spin frozen at the magic energy with the projected sensitivity dp ∼ 10 −29 e•cm. The prototype storage ring PTR is proposed as a precursor to such a dedicated storage ring, with the prospect of the frozen proton spin ring becoming a part of the physics at CERN beyond the Large Hadron Collider program. Following a brief introduction to the CP -violation physics and the baryogenesis, the review presents a detailed discussion of significant contributions to the spin dynamics from the terrestrial gravity along with the new effects of Earth's rotation in ultrasensitive searches for the EDM of charged particles and neutrons. Quite remarkably, for the projected sensitivity to the proton EDM, these false EDM effects can by one to two orders of magnitude exceed the signal of the proton EDM, and become comparable to an EDM contribution in experiments with ultracold neutrons. We also discuss the role of a precessing spin as a detector of the axion-like dark matter, and consider applications of the quantum gravitational anomalies to the dense matter hydrodynamics and the spin phenomena in the non-central nuclear collisions.

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“…In parallel, new technical equipment has been developed and installed in the COSY ring [12][13][14][15][16]. Systematic studies on ring imperfections and spin dynamics [17][18][19][20], beam-based alignment [21], and techniques that allow for the systematic evaluation of uncertainties [22] completed these investigations. All the experimental work was accompanied by theoretical studies and lattice simulations of spin and particle tracking [23,24].…”

Section: Introductionmentioning

confidence: 99%

Spin Physics at COSY (2021-2024 and beyond) -- Pathfinder investigations toward an EDM storage ring and Spin-for-FAIR

Gebel,

Hejny,

Kacharava

et al. 2021

Preprint

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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 the study of charged particle EDMs (Electric Dipole Moment) in storage rings. The role of COSY as a R&D facility and for initial (static and oscillating) EDM measurements can hardly be overestimated. Unfortunately, as a consequence of the strategic decisions of Forschungszentrum Jülich and the subsequent "TransFAIR" agreement between FZJ and GSI Darmstadt, it is currently planned to stop the operation of COSY by the end of 2024. The various groups working with polarized beams at COSY felt it important to collect information on essential measurements to be performed until the termination of machine operation. These experiments, briefly described in this document along with an estimate of the beam time required, serve as pathfinder investigations toward an EDM storage ring and Spin for FAIR.

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Beam-based alignment at the Cooler Synchrotron COSY as a prerequisite for an electric dipole moment measurement

Cited by 7 publications

References 12 publications

Method to evaluate systematic uncertainties due to magnet misalignments in electric dipole moment measurements using a storage ring

Method to evaluate systematic uncertainties due to magnet misalignments in electric dipole moment measurements using a storage ring

General relativity effects in precision spin experimental tests of fundamental symmetries

Spin Physics at COSY (2021-2024 and beyond) -- Pathfinder investigations toward an EDM storage ring and Spin-for-FAIR

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