CERN Yellow Reports: Monographs, Vol. 3 (2021): Storage ring to search for electric dipole moments of charged particles: Feasibility study

doi:10.23731/cyrm-2021-003

Cited by 14 publications

(31 citation statements)

References 5 publications

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“…This would distinguish such a signal from a real EDM signal, which will be identical for both beams. However small the displacement may be, the false EDM effect due to the gravity-compensating electric field is even larger than the EDM effect expected for d p = 10 −29 e cm [2,7,8].…”

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confidence: 82%

“…Introduction One of grand challenges in particle physics is the search for physics beyond the Standard Model (BSM). At the forefront of the high precision frontier is the proposed search for the electric dipole moment (EDM) of protons stored in an all-electric frozen-spin storage rings with a sensitivity of d p ∼ 10 −29 e cm that is some 15 orders of magnitude smaller than the magnetic dipole moment of the proton [1][2][3]. The primary motivation is that the experimental observation of a permanent EDM of any subatomic particle implies the explicit violation of time reflection (T) and parity (P) symmetries, and therefore, according to the CPT theorem, also involves the violation of CP in the flavor-preserving channel.…”

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confidence: 99%

“…Proper control of systematic effects encountered in the search for such a minuscule EDM requires concurrent measurements of the spin rotations of beams propagating in opposite directions in an all-electric ring. To achieve such an ambitious goal, one of the crucial tasks is to control the difference of the vertical positions of the two beams along the orbit in the machine with an accuracy of about 5 pm [2]. One may wonder whether such enormously demanding accuracy is not prohibited by the Heisenberg uncertainty principle.…”

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confidence: 99%

“…Vertical splitting of counter-propagating beams due to Earth's gravity As an introduction into the subject, we explain how picometer-scale beam displacements emerge in the EDM experiment in storage rings. The attraction of the Earth on the beam particles can not be switched off and must be compensated for by the focusing electromagnetic fields: either radial magnetic fields in the case of focusing by magnetic quadrupoles [3,6], or vertical electric fields in the case of electric focusing [1,2,7,8]. The force of the gravitational attraction is given by…”

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confidence: 99%

“…Of particular interest is the all-electric frozen-spin ring for counter-rotating beams of protons with kinetic energy T p = 233 MeV. The often discussed lattice for such a ring with focusing by electric quadrupoles anticipates a circumference of 500 m with ω rev = 2.26 × 10 6 s −1 and vertical betatron tune ν y = 0.45 [1,2]. The coherent vertical displacement of the beams induced by the Earth's gravity is therefore…”

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confidence: 99%

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Quantum mechanics of radiofrequency-driven coherent beam oscillations in storage rings

Slim¹,

Николаев²,

Rathmann³

et al. 2021

Preprint

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confidence: 82%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Quantum mechanics of radiofrequency-driven coherent beam oscillations in storage rings

Slim¹,

Николаев²,

Rathmann³

et al. 2021

Preprint

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Electric dipole moment of charged particles using storage rings

Shmakova

2023

EPJ Web of Conf.

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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 SM is being explored. The search for permanent Electric Dipole Moments (EDMs) of elementary particles has the potential to provide a powerful tool to discover new sources of CP-violation. Finding an EDM would be a convincing indication for physics beyond the SM. Moreover, a rotating polarized beam used in EDM searches is sensitive to oscillating EDM caused by axions or axion-like particles (ALPs), the candidates for the dark matter. Storage rings are promising devices 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/c and it constitutes an suitable testing ground and starting point for 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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Superimposed electric/magnetic “dipole moment comparator” lattice design

Talman¹

2021

J. Inst.

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In contrast to a “single particle table-top trap”, an essential feature of a storage ring “trap” is that 1010 or more particles can have their spins aligned in a polarized beam. This is a nunber of polarized particles large enough for the beam polarization to be detected externally, and fed back to permit external control of the beam polarization. Though the table large enough for any such “storage ring trap” is quite large, the level of achievable spin control, though classical, not quantum mechanical, can be comparable to the control of one or a small number of polarized particles in a low energy trap. Motivated to investigate time reversal invariance, especially the detection of non-zero electric dipole moments (EDMs) this paper describes the design of a low energy storage ring having the superimposed electric and magnetic bending needed to “freeze” the spins of polarized beams. For electrons (of either sign) and protons the spins can be frozen with all-electric bending but, in general, superimposed electric/magnetic bending is required. Since constructive bending superposition in one direction implies destructive superposition in the other direction, counter-circulating beams must differ, either in particle type or momentum, in order for their orbits to be identical. For globally frozen spin operation the bunch polarizations remain constant relative to the momenta, for example remaining parallel to the circuating beam momentum vectors. With superimposed electric and magnetic bending, the globally frozen spin condition can be met over a continua (specific to particle type) of E/B ratios. When this condition is met, the out-of-plane, EDM-induced precession accumulates monitonically, which is obligatory for producing a measurably large EDM signal. As Koop has explained, the EDM signal will still accumulate if the polarization is allowed to “roll like a wheel” around a radial axis.

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CERN Yellow Reports: Monographs, Vol. 3 (2021): Storage ring to search for electric dipole moments of charged particles: Feasibility study

Cited by 14 publications

References 5 publications

Quantum mechanics of radiofrequency-driven coherent beam oscillations in storage rings

Quantum mechanics of radiofrequency-driven coherent beam oscillations in storage rings

Electric dipole moment of charged particles using storage rings

Superimposed electric/magnetic “dipole moment comparator” lattice design

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