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High efficiency positron accumulation for high-precision magnetic moment experiments.

S Fogwell Hoogerheide1, J C Dorr1, E Novitski1

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Summary

This study details a new Penning trap for precise positron and electron magnetic moment measurements. The setup uses a safe, license-free radioactive source and a 6 T magnetic field for enhanced accuracy.

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Area of Science:

  • Atomic Physics
  • Particle Physics
  • Quantum Electrodynamics

Background:

  • Precise measurement of fundamental particle properties is crucial for testing theories like Quantum Electrodynamics.
  • Existing methods for measuring magnetic moments require highly controlled environments and specialized equipment.
  • Positrons, the antiparticles of electrons, offer unique opportunities for precision measurements.

Purpose of the Study:

  • To develop and describe a novel Penning trap apparatus for highly accurate measurements of positron and electron magnetic moments.
  • To ensure the safety and accessibility of radioactive sources used in particle trapping experiments.
  • To establish a stable and strong magnetic field environment for trapping charged particles.

Main Methods:

  • Accumulation of positrons within a cryogenic (100 mK) Penning trap.
  • Utilization of a weak, license-free retractable radioactive source for positron generation.
  • Generation of a 6 Tesla magnetic trapping field using a superconducting solenoid mechanically coupled to the trap.
  • Minimizing environmental radiation exposure through source design.

Main Results:

  • The apparatus successfully accumulates positrons for magnetic moment studies.
  • The radioactive source is sufficiently weak to avoid licensing requirements and minimize radiation exposure.
  • A stable 6 T magnetic field is established within the superconducting solenoid for particle trapping.
  • The cryogenic environment (100 mK) and mechanical coupling ensure optimal trapping conditions.

Conclusions:

  • The developed Penning trap system provides a safe and effective platform for precise positron and electron magnetic moment measurements.
  • The experimental design facilitates high-accuracy measurements by combining a cryogenic trap, a weak radioactive source, and a strong superconducting magnet.
  • This work contributes to advancing precision measurements in fundamental physics, enabling stringent tests of theoretical predictions.