| Paper |
Title |
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| TUB03 |
Methods and Systematic Errors for Searching for the Electric Dipole Moment of Charged Particle Using a Storage Ring |
44 |
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- V. Senichev, A.E. Aksentyev, A.A. Melnikov
RAS/INR, Moscow, Russia
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One of possible argument for CP-invariance violation is the existence of non-vanishing electric dipole moment (EDM) of elementary particles. To search for the EDM the BNL proposed to construct a special ring implementing the frozen spin mode in order to detect the EDM signal. Since systematic errors determine the sensitivity of a method, this article analyzes some major methods proposed for searching for the EDM from the point of view of this problem. The frequency domain method (FDM) proposed by the authors does not require a special accelerator for deuterons and requires spin precession frequency measurements only. The method has four features: the total spin precession frequency due both to the electric and the magnetic dipole moments in an imperfect ring in the longitudinal-vertical plane is measured at an absolute statistic error value of ~10-7 rad/sec in one ring filling; the ring elements position remain unchanged when changing the beam circulation direction from clockwise (CW) to counterclockwise (CCW); calibration of the effective Lorentz factor by means of spin precession frequency measurements in the horizontal plane is carried out alternately in each CW and CCW procedure; the approximate relationship between the spin precession frequency components is set to exclude them from mixing to the expected EDM signal at a statistical sensitivity level approaching 10-29 e cm. The FDM solves the problem of systematic errors, and can be applied in the NICA facility.
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Slides TUB03 [6.184 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-RuPAC2021-TUB03
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| About • |
Received ※ 10 September 2021 — Revised ※ 18 September 2021 — Accepted ※ 27 September 2021 — Issued ※ 17 October 2021 |
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| TUPSB08 |
Magneto-Optical Structure of the NICA Collider With High Critical Energy |
245 |
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- S.D. Kolokolchikov, V. Senichev
RAS/INR, Moscow, Russia
- E. Syresin
JINR, Dubna, Moscow Region, Russia
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In the proton option of the NICA collider, there is a problem of crossing transition energy. To do this, we have investigated ways to increase the critical energy for the proton option of the NICA collider. The method of superperiodic modulation of quadrupole gradients is applied. Two variants of dispersion suppression on the arch for matching with straight sections are considered. The selection of sextupoles is carried out to suppress the natural chromaticity and compensate for the sextupole component. The Twiss parameters for the proposed structures are given, as well as the dynamic apertures and working points are investigated.
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Poster TUPSB08 [3.646 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-RuPAC2021-TUPSB08
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| About • |
Received ※ 17 September 2021 — Revised ※ 27 September 2021 — Accepted ※ 02 October 2021 — Issued ※ 21 October 2021 |
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| TUPSB10 |
Modeling of the Spin-Navigator Method for Manipulating the Beam Polarization in a Spin-Transparent Storage Ring |
251 |
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- A.E. Aksentyev, A.A. Melnikov, V. Senichev
RAS/INR, Moscow, Russia
- A.E. Aksentyev
MEPhI, Moscow, Russia
- V. Ladygin
JINR, Dubna, Moscow Region, Russia
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A method for manipulating the orientation of the beam polarization axis based on using the so-called "spin-navigator" technique in a storage ring operating in the spin-transparent regime has been modelled. The beam particles’ spin- and orbital dynamics have been numerically investigated with the purpose of determining the method’s feasibility; the latter’s effect on spin-decoherence has been studied also.
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Poster TUPSB10 [1.848 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-RuPAC2021-TUPSB10
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| About • |
Received ※ 24 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 06 October 2021 |
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| TUPSB11 |
Numerical Investigation of the Robustness of Spin-Navigator Polarization Control Method in a Spin-Transparent Storage Ring |
254 |
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- A.A. Melnikov, A.E. Aksentyev, V. Senichev
RAS/INR, Moscow, Russia
- A.E. Aksentyev
MEPhI, Moscow, Russia
- V. Ladygin
JINR, Dubna, Moscow Region, Russia
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The robustness of spin-navigator based method for manipulating the beam polarization axis has been investigated with respect to bend magnet installation errors. Toward that end, variation of the invariant spin axis components along the beamline of an imperfect storage ring operating in the spin-transparent mode has been estimated. The beam polarization vector behavior in the given lattice has been investigated. Conclusions are made regarding the feasibility of using spin navigator solenoids for defining the beam polarization axis in the detector region.
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Poster TUPSB11 [0.536 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-RuPAC2021-TUPSB11
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| About • |
Received ※ 12 September 2021 — Revised ※ 13 September 2021 — Accepted ※ 20 September 2021 — Issued ※ 11 October 2021 |
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