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Phase Locking the Spin Precession in a Storage Ring.

N Hempelmann1,2, V Hejny2, J Pretz1,2,3

  • 1III. Physikalisches Institut B, RWTH Aachen University, 52056 Aachen, Germany.

Physical Review Letters
|July 22, 2017
PubMed
Summary
This summary is machine-generated.

Researchers successfully controlled the spin polarization of a deuteron beam using feedback in a storage ring. This technique precisely manipulates particle polarization, crucial for searching for electric dipole moments.

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Area of Science:

  • Particle Physics
  • Accelerator Physics

Background:

  • Precise control of particle spin polarization is essential for fundamental physics experiments.
  • Storage rings offer unique environments for manipulating and studying particle beams.

Purpose of the Study:

  • To demonstrate a feedback method for controlling spin polarization in a storage ring.
  • To enable precise manipulation of the precession rate and polarization phase.
  • To meet requirements for searching for the electric dipole moment of charged particles.

Main Methods:

  • Utilized spin polarization measurement feedback to adjust the revolution frequency of a deuteron beam in the Cooler Synchrotron (COSY).
  • Synchronized in real-time with a radio frequency (rf) solenoid to rotate polarization out of the horizontal plane.
  • Controlled the horizontal polarization phase to within a 1 standard deviation of 0.21 radians.

Main Results:

  • Successfully controlled the precession rate (≈121 kHz) and horizontal polarization phase of a 0.97 GeV/c polarized deuteron beam.
  • Demonstrated real-time polarization manipulation by rotating it out of the horizontal plane.
  • Achieved precise control over the polarization rotation rate, showing a sinusoidal dependence on phase.

Conclusions:

  • The developed feedback method effectively manipulates particle beam polarization in a storage ring.
  • This technique provides the necessary precision for experiments searching for intrinsic electric dipole moments.
  • The study validates a novel approach for controlling spin dynamics in accelerator facilities.