A new beam polarimeter at COSY to search for electric dipole moments of charged particles

Müller, Fabian; Javakhishvili, O.; Shergelashvili, D.; Keshelashvili, I.; Mchedlishvili, D.; Abusaif, F.; Aggarwal, A.; Barion, L.; Basile, S.; Böker, J.; Canale, N.; Ciullo, G.; Dymov, S.; Felden, O.; Gagoshidze, M.; Gebel, R.; Demary, Nils; Grigoryev, K.; Grzonka, D.; Hahnraths, T.; Hejny, V.; Kacharava, A.; Kamerdzhiev, V.; Karanth, S.; Куликов, А. И.; Lehrach, A.; Lenisa, P.; Lomidze, N.; Lorentz, B.; Macharashvili, G.; Magiera, A.; Metreveli, Z.; Nass, A.; Николаев, Н. Н.; Nioradze, M.; Pesce, A.; Poncza, V.; Prasuhn, D.; Pretz, J.; Rathmann, F.; Saleev, A.; Sefzick, T.; Senichev, Y.; Shmakova, V.; Slim, J.; Soltner, H.; Stephenson, E. J.; Ströher, H.; Tabidze, M.; Tagliente, G.; Uzikov, Yu. N.; Valdau, Yu.; Wagner, Tim; Wrońska, A.; Wüstner, P.; Żurek, M.

doi:10.1088/1748-0221/15/12/p12005

Cited by 6 publications

(6 citation statements)

References 35 publications

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“…The beam polarization is measured with a polarimeter by scattering a fraction of the particles on a carbon target. The asymmetry in the scattering rate indicates the polarization orientation [6]. A solenoid is used to rotate the polarization into the radial plane (= accelerator plane), where the polarization vector starts to rotate around the so-called ISA according to the Thomas-BMT equation [2].…”

Section: Methodsmentioning

confidence: 99%

Determination of the Invariant Spin Axis in a COSY model using Bmad

Vitz,

Lehrach,

Pretz

2024

J. Phys.: Conf. Ser.

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The matter-antimatter asymmetry might be understood by investigating the EDM (Electric Dipole Moment) of elementary particles. A permanent EDM of a subatomic particle violates time reversal and parity symmetry at the same time and would be, with the currently achievable experimental accuracy, an indication for further CP violation than established in the SM (Standard Model of Particle Physics). The JEDI-Collaboration (Jülich Electric Dipole moment Investigations) in Jülich has performed a direct EDM measurement for deuterons with the so-called precursor experiments at the storage ring COSY (COoler SYnchrotron) by measuring the orientation of the ISA (Invariant Spin Axis). In order to interpret the measured data and to disentangle a potential EDM signal from systematic effects, spin tracking simulations in an accurate simulation model of COSY are needed. Therefore a model of COSY was implemented using the software library Bmad. Systematic effects were considered by including element misalignments, effective dipole shortening, longitudinal fields and steerer kicks. These effects rotate the ISA in addition to the EDM and have to be analyzed and understood. The most recent spin tracking results as well as the methods to find the ISA are presented in this paper.

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Section: Methodsmentioning

confidence: 99%

Determination of the Invariant Spin Axis in a COSY model using Bmad

Vitz,

Lehrach,

Pretz

2024

J. Phys.: Conf. Ser.

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“…An EDM of 𝑑 = 10 −26 e • cm corresponds to 𝜂 EDM = 1.9 • 10 −12 . After bunching and electron cooling, the beam was extracted on a carbon block target and the elastically scattered deuterons were detected with the JEPO polarimeter [12]. Subsequently, the spins of the particles were rotated into the horizontal plane by means of an radio-frequency (RF) solenoid.…”

Section: Pos(pstp2022)035mentioning

confidence: 99%

The search for electric dipole moment of charged particles using storage rings

Shmakova¹

2023

Proceedings of 19th Workshop on Polarized Sources, Targets and Polarimetry — PoS(PSTP2022)

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The Standard Model (SM) of Particle Physics cannot explain the matter-antimatter asymmetry in the Universe. Especially, new sources of CP-violation are necessary, and this is why physics beyond the ST is being explored. The search for permanent Electric Dipole Moments (EDMs) of elementary particles has the potential to provide a powerful tool to probe such new sources of CP-violation. Finding an EDM would be a convincing indication for physics beyond the SM. Storage rings make it possible to measure EDMs of charged particles by observing the effect of the EDM on the spin motion in the ring. The Cooler Synchrotron COSY at the Forschungszentrum Jülich provides polarized protons and deuterons with momenta up to 3.7 GeV/s and it constitutes an ideal testing ground and starting point for such an experimental program to search for EDMs of charged particles. This report provides an overview of the current status of the JEDI project for the first direct measurement of the deuteron EDM at COSY. The analysis is currently ongoing. Due to the complexity of storage rings, this study combines high precision measurements and thorough understanding of the systematic uncertainties involved.

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“…• Proton beam polarization measurements will be made using the JEPO polarimeter [14] by recording forward elastic scattering events. The optimum operation range for protons is in a similar energy range as the electron cooling range and the average analyzing power within the acceptance of the polarimeter drops with decreasing energy.…”

Section: Spin Physics Proposals For Cosy 21 Spin-coherence Time Inves...mentioning

confidence: 99%

“…This work also resulted in a number of tools to measure the spin coherence time as well as the spin tune and to phase-lock the spin precession to an external RF resonator (RF solenoid, RF Wien filter) [10,11]. 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.…”

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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A new beam polarimeter at COSY to search for electric dipole moments of charged particles

Cited by 6 publications

References 35 publications

Determination of the Invariant Spin Axis in a COSY model using Bmad

Determination of the Invariant Spin Axis in a COSY model using Bmad

The search for electric dipole moment of charged particles using storage rings

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

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