Journal Article GSI-2022-00294

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First detection of collective oscillations of a stored deuteron beam with an amplitude close to the quantum limit

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2021
American Physical Society College Park, MD

Physical review accelerators and beams 24(12), 124601 () [10.1103/PhysRevAccelBeams.24.124601]

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Report No.: arXiv:2101.07582

Abstract: We investigated coherent betatron oscillations of a deuteron beam in the storage ring cooler synchrotron and storage ring, excited by a detuned rf Wien filter (WF). The beam oscillations were detected by conventional beam position monitors. With the currently available apparatus, we show that oscillation amplitudes down to 1 μm can be detected. The interpretation of the response of the stored beam to the detuned rf WF is based on simulations of the beam evolution in the lattice of the ring and realistic time-dependent 3D field maps of the WF. Future measurements of the electric dipole moment of protons will, however, require control of the relative position of counter-propagating beams in the sub-picometer range. Since here the stored beam can be considered as a rarefied gas of uncorrelated particles, we moreover demonstrate that the amplitudes of the zero-point (ground state) betatron oscillations of individual particles are only a factor of about 10 larger than the Heisenberg uncertainty limit. As a consequence of this, we conclude that quantum mechanics does not preclude the control of the beam centroids to sub-picometer accuracy. The smallest Lorentz force exerted on a single particle that we have been able to determine is 10 aN.

Keyword(s): deuteron, beam ; p, electric moment ; force, Lorentz ; betatron oscillation, coherence ; oscillation, collective ; Heisenberg ; beam oscillation ; time dependence ; ground state ; gas ; quantum mechanics ; lattice ; Juelich COSY PS ; zero-point ; beam position

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Note: 20 pages, 16 figures "Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI."

Contributing Institute(s):
  1. FAIR Forschung NRW (FFN)
  2. HESR (HES)
Research Program(s):
  1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)
Experiment(s):
  1. External experiment at external facility/ no experiment at GSI (POF3; other)

Appears in the scientific report 2021
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Creative Commons Attribution CC BY 4.0 ; DOAJ ; OpenAccess ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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 Record created 2022-02-04, last modified 2023-10-15