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The Axion Dark Matter eXperiment (ADMX) Sidecar pathfinder experiment searched for micro-electronvolt axions. It excluded axion masses in three frequency ranges and demonstrated new tuning technology for future dark matter searches.

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Area of Science:

  • Particle physics
  • Cosmology
  • Astrophysics

Background:

  • The Standard Model of particle physics lacks a dark matter candidate.
  • Axions are hypothetical particles proposed as a solution to the dark matter problem.
  • The Axion Dark Matter eXperiment (ADMX) searches for axions by detecting their conversion to photons.

Purpose of the Study:

  • To report results from the ADMX Sidecar pathfinder experiment.
  • To demonstrate new technologies for future, higher-mass axion searches.
  • To exclude specific mass ranges for micro-electronvolt axions.

Main Methods:

  • Operating a testbed experiment (Sidecar) in tandem with the main ADMX experiment.
  • Utilizing a strong magnetic field to induce axion-to-photon conversion.
  • Employing a piezoelectric actuator for precise cavity tuning.
  • Measuring data using both TM_{010} and TM_{020} cavity modes.

Main Results:

  • Excluded axion masses in three frequency ranges: 4202-4249 MHz, 5086-5799 MHz, and 7173-7203 MHz.
  • Successfully demonstrated the use of a piezoelectric actuator for cavity tuning.
  • Presented the first data measured using both TM_{010} and TM_{020} modes.

Conclusions:

  • The ADMX Sidecar experiment successfully paved the way for future, higher-mass axion searches.
  • The demonstrated technologies enhance the capabilities for detecting dark matter axions.
  • This work contributes to the ongoing search for physics beyond the Standard Model.