Author: Kolokolchikov, S.D.
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MOPOTK024 Quasi-Frozen Spin Concept of Magneto-Optical Structure of NICA Adapted to Study the Electric Dipole Moment of the Deuteron and to Search for the Axion 492
 
  • Y. Senichev, A.E. Aksentyev, S.D. Kolokolchikov, A.A. Melnikov
    RAS/INR, Moscow, Russia
  • A.E. Aksentyev
    MEPhI, Moscow, Russia
  • V. Ladygin, E. Syresin
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • N. Nikolaev
    Landau ITP, Chernogolovka, Russia
  
  Funding: We acknowledge a support by the joint Deutsche ForschungsGemeinschaft (DFG) and Russian Science Foundation (RSF) grant 22-42-04419
The "frozen spin" method is based on the fact that at a certain parameters of the ring, the particle spin rotates with the frequency of the momentum, creating conditions for the continuous growth of the electric dipole moment signal. Since a straightforward implementation of the frozen spin regime at NICA is not possible, we suggest an alternative quasi-frozen spin approach concept. In this new regime, the spin oscillates about particle orbit with the spin phase advance pi*gamma*G/2, locally recovering the longitudinal orientation at the location of the electric-magnetic Wien filters in the straight sections. In the case of deuterons, thanks to the small magnetic anomaly G, the spin continuously oscillates relative to the direction of the momentum with a small amplitude of a few degrees and the expected EDM effect is reduced only by a few percent. In this paper, we study the spin-orbital motion with the aim of using the NICA collider to measure the EDM. We also comment on the potential of NICA as an axion antenna in both the quasi-frozen spin regime and beyond. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-MOPOTK024  
About • Received ※ 16 May 2022 — Revised ※ 11 June 2022 — Accepted ※ 12 June 2022 — Issue date ※ 01 July 2022
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WEPOPT002 Conception of High Intensive Polarized Proton Beam Formation in NICA Collider 1822
 
  • E. Syresin, A.V. Butenko, S.A. Kostromin, O.S. Kozlov, I.N. Meshkov, A.O. Sidorin, G.V. Trubnikov, A. Tuzikov
    JINR, Dubna, Moscow Region, Russia
  • Y. Filatov
    MIPT, Dolgoprudniy, Moscow Region, Russia
  • S.D. Kolokolchikov, Y. Senichev
    RAS/INR, Moscow, Russia
  • A.M. Kondratenko, M.A. Kondratenko
    Science and Technique Laboratory Zaryad, Novosibirsk, Russia
  • N.V. Mityanina
    BINP SB RAS, Novosibirsk, Russia
  • P.R. Zenkevich
    ITEP, Moscow, Russia
  
  NICA (Nuclotron-based Ion Collider fAcility) is a new accelerator complex being assembled at JINR to search for the mixed phase of baryonic matter and to investigate the nature of nucleon/particle spin. The polarized proton beams will be operated at the energy range of 5-12.6 GeV, the beam intensity in each ring of 2.2x1013 and the luminosity of 1x1032 cm-2 s-1. The conception of formation of high intensive proton beams is discussed for two different schemes. In first scheme the protons are injected from Nuclotron to Collider at an energy of 2-2.5 GeV to provide the cooling and the storage at this energy and then they are accelerated up to energy of experiments. In the second scheme the cooling of protons is realized in one from accelerators of the injection chain and the protons are injected from Nuclotron to Collider at energy of experiments, where they are stored up required intensity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOPT002  
About • Received ※ 03 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 10 June 2022 — Issue date ※ 12 June 2022
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WEPOPT004 Acceleration and Crossing of Transition Energy Investigation Using an RF Structure of the Barrier Bucket Type in the NICA Accelerator Complex 1829
 
  • S.D. Kolokolchikov, A.A. Melnikov, Y. Senichev
    RAS/INR, Moscow, Russia
  • E. Syresin
    JINR, Dubna, Moscow Region, Russia
  
  The dynamic of longitudinal motion in Barrier Bucket RF structure is considered. To preserve the stability of the proton beam during the acceleration to the experiment energy it is necessary to cross the transition energy and a rapid jump of transition energy is possible. The influence of the second-order slip factor is taking into account, as well as the space charge effect. The dynamic aperture is investigated for various gradients of focusing quadrupoles and corresponding working points which is necessary for transition crossing.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOPT004  
About • Received ※ 16 May 2022 — Revised ※ 15 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 23 June 2022
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