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Related Experiment Video

Updated: Oct 8, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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Axion Dark Matter Experiment: Detailed design and operations.

R Khatiwada¹, D Bowring², A S Chou³

¹Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA and Fermilab Quantum Institute, Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.

The Review of Scientific Instruments

|January 1, 2022

Summary

The Axion Dark Matter Experiment achieved unprecedented sensitivity in searching for axions, a dark matter candidate, using advanced haloscope technology. This breakthrough pushes the boundaries of dark matter detection in the sub-meV mass range.

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Area of Science:

Particle Physics
Cosmology
Astrophysics
Experimental Physics

Background:

Dark matter constitutes a significant portion of the universe's mass, and axions are leading theoretical candidates.
Previous axion searches have been limited by experimental sensitivity and the mass range explored.
The Dine-Fischler-Srednicki-Zhitnisky (DFSZ) model provides a theoretical framework for axion interactions.

Purpose of the Study:

To conduct the most sensitive search to date for dark matter axions in the 2.66–3.1 μeV mass range.
To detail the technological advancements enabling this unprecedented sensitivity.
To demonstrate the application of novel amplifier technologies and analysis techniques in axion detection.

Main Methods:

Utilized ultra-low noise haloscope technology, a resonant cavity detector for axions.
Implemented state-of-the-art quantum-noise-limited amplifiers, including a tunable microstrip superconducting quantum interference device (SQUID) amplifier and a Josephson parametric amplifier.
Employed a dilution refrigerator for cryogenic operation and advanced analysis tools for system noise characterization.

Main Results:

Successfully completed two science runs (1A and 1B), achieving the highest sensitivity for axion dark matter in the 2.66–3.1 μeV mass range.
Demonstrated the effectiveness of quantum-noise-limited amplifiers in pushing experimental sensitivity.
Characterized system noise temperatures with novel analysis tools, crucial for interpreting results.

Conclusions:

The experiment represents the most sensitive axion search to date in the specified mass range.
Technological advancements in haloscope design and quantum amplifiers are key to future dark matter searches.
The results place stringent constraints on axion properties, informing dark matter models.