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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Axion dark matter: How to see it?

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The axion, a hypothetical particle, could solve the strong charge-parity problem and explain dark matter. Experiments are advancing to detect axions using microwave resonators and sensitive amplifiers, covering a wide frequency range.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Experimental Physics

Background:

  • The axion is a theoretically motivated particle addressing the strong CP problem and dark matter.
  • Experimental searches for axions are reaching significant sensitivity levels, particularly in the micro-electron volt (GHz) range.

Purpose of the Study:

  • To review the experimental aspects of axion physics.
  • To discuss the past, present, and future of direct axion search programs.

Main Methods:

  • Utilizing microwave resonators in strong magnetic fields.
  • Employing quantum noise-limited amplifiers for signal readout.
  • Developing diverse techniques to broaden search ranges and enhance sensitivity.

Main Results:

  • Experimental sensitivity is approaching theoretically interesting levels for axion detection.
  • The 1-25 GHz frequency range is expected to be explored within the next decade.
  • Orthogonal experimental approaches will cover significant axion parameter space.

Conclusions:

  • Direct axion search programs are crucial for addressing fundamental physics questions.
  • Advancements in experimental techniques are enabling comprehensive exploration of axion parameter space.
  • The next decade promises significant progress in axion detection and understanding.