Schemes for radiative polarization of ion beams in storage rings

Prozorov, A.; Labzowsky, L. N.; Liesen, D.; Bosch, F.

doi:10.1016/j.physletb.2003.09.025

Cited by 27 publications

(29 citation statements)

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“…The interaction of the several orders of magnitude smaller nuclear magnetic moment with the external magnetic fields along the ring is usually negligibly small. Throughout this Brief Report we consider H-like ions of the isotope 63'Eu with nuclear spin / = 5/2 as an example for numerical calculations.The degree of polarization of a system with total angular momentum j and projection m is given by [5] kJ = l J 2 mnJjm'( 1) • ' m where n1 -are the occupation numbers for the magnetic substates f/jm with the normalization condition J2m njm = 1-Specifying the indices in Eq. (1) for the case of H-like ions we obtain j -F, (total angular momentum of the H-like ion), m = Mf .…”

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confidence: 99%

“…The degree of polarization of a system with total angular momentum j and projection m is given by [5] kJ = l J 2 mnJjm'…”

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confidence: 99%

“…Except for highly charged ions (HCI), the techniques for polarizing beams of electrons, protons, and muons have been well developed by now. However, during the last years several experiments using just polar ized HCI for tests of fundamental symmetries like parity nonconservation (PNC) and for the search for a nuclear and an electron electric dipole moment (EDM) have been proposed ( [1][2][3][4][5]). …”

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Method for the production of highly charged ions with polarized nuclei and zero total electron angular momentum

et al. 2014

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The capture of polarized electrons by H-like ions provides a method for polarizing the nuclei of He-like heavy ions with zero total electron angular momentum in storage rings for high-energy ions. A detailed analysis for gj'Eu ions with nuclear spin / = 5/2 predicts a nuclear polarization degree of about 47% already after one passage through a target containing 100% polarized electrons. Almost 50% of the polarized He-like ions are predicted to be in states with zero total electron angular momentum. Such ions were recently considered as the most promising candidates in experiments at storage rings for the search for violations of the fundamental symmetries and for a nuclear and an electron electric dipole moment.During the last decades, experiments with spin-polarized particles became of primary importance in low-energy fun damental physics. Except for highly charged ions (HCI), the techniques for polarizing beams of electrons, protons, and muons have been well developed by now. However, during the last years several experiments using just polar ized HCI for tests of fundamental symmetries like parity nonconservation (PNC) and for the search for a nuclear and an electron electric dipole moment (EDM) have been proposed ([1-5]).Up to now, only a theoretical investigation of a method for polarizing the nuclei of HCI by selective laser excitation of the hyperfine sublevels of H-like ions has been performed ([5]). However, in all cases considered, the typical beam velocity of 0.3 c and 106 revolutions per second around the ring yielded building-up times for an almost 100% degree of polarization much longer than the revolution time around the ring. Already after one revolution, the interaction between the magnetic moment of the ions and the magnetic system needed for ion beam bending and focusing destroys the beam polarization completely and thus a continuous building up of the beam polarization is impossible. In-ring mounting of special insertion devices like Siberian Snakes [6,7], which are special magnets for a controlled rotation of the direction of the polarization of the particles, can partly avoid the loss of polarization. Nevertheless, even with the use of Siberian Snakes the conditions for the control of many of the magnetic fields in the ring regarding strength, direction, and time dependence necessary to avoid the depolarizing effects remain extremely restrictive.Another important problem is the monitoring of the degree of beam polarization, which is of great importance for the quantitative analysis of the experimental results. A promising proposal seems to be the observation of the linear polarization of x rays in the process of radiative recombination (RR) between ions and electrons. This idea was suggested in Ref.[8] and later developed and partly exploited experimentally in Refs. [9][10][11].It is obvious that a strong reduction of the building-up time of the polarization would be an essential improvement for the experiments envisaged. At best, the full beam polarization should be recovered after every re...

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“…The degree of polarization of a system with total angular momentum j and projection m is given by [5] kJ = l J 2 mnJjm'…”

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confidence: 99%

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confidence: 99%

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Method for the production of highly charged ions with polarized nuclei and zero total electron angular momentum

et al. 2014

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“…Similarly to the electron density operator (1), these relative occupation numbers, n FM F , may be used to describe the polarization of the incoming projectile ions. In practice, however, it is usually more convenient to introduce an averaged polarization parameter (Prozorov et al, 2003;Surzhykov et al, 2005a) …”

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confidence: 99%

“…Any realization of such polarization experiments will require, however, the solution of two key problems, concerning (i) the production of polarized ion beams and (ii) the measurement of this polarization. A possible scheme for producing polarized, hydrogen-like ions was discussed by Prozorov et al (2003). In particular, these authors proposed to apply the optical pumping of the hyperfine levels of the hydrogenlike 1s ground state in order to obtain a predominant population of one of the hyperfine states jFM F i and, hence, a non-zero nuclear polarization.…”

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Effects of the target polarization on the diagnostics of spin-polarized heavy ions

Surzhykov

Fritzsche

Stöhlker

2007

Radiation Physics and Chemistry

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Atomic Physics Studies at the Gamma Factory at CERN

et al. 2020

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The Gamma Factory initiative proposes to develop novel research tools at CERN by producing, accelerating, and storing highly relativistic, partially stripped ion beams in the SPS and LHC storage rings. By exciting the electronic degrees of freedom of the stored ions with lasers, high-energy narrow-band photon beams will be produced by properly collimating the secondary radiation that is peaked in the direction of ions' propagation. Their intensities, up to 10 17 photons per second, will be several orders of magnitude higher than those of the presently operating light sources in the particularly interesting-ray energy domain reaching up to 400 MeV. This article reviews opportunities that may be afforded by utilizing the primary beams for spectroscopy of partially stripped ions circulating in the storage ring, as well as the atomic-physics opportunities made possible by the use of the secondary high-energy photon beams. The Gamma Factory will enable groundbreaking experiments in spectroscopy and novel ways of testing fundamental symmetries of nature.

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Schemes for radiative polarization of ion beams in storage rings

Cited by 27 publications

References 13 publications

Method for the production of highly charged ions with polarized nuclei and zero total electron angular momentum

Method for the production of highly charged ions with polarized nuclei and zero total electron angular momentum

Effects of the target polarization on the diagnostics of spin-polarized heavy ions

Atomic Physics Studies at the Gamma Factory at CERN

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