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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Tunable Axion Plasma Haloscopes.

Matthew Lawson1,2, Alexander J Millar1,2, Matteo Pancaldi3

  • 1The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova, 10691 Stockholm, Sweden.

Physical Review Letters
|November 9, 2019
PubMed
Summary
This summary is machine-generated.

We propose a new plasma haloscope strategy for detecting dark matter axions. This method uses tunable cryogenic plasmas to match axion mass to plasma frequency, enabling sensitive detection across a wide mass range.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Condensed Matter Physics

Background:

  • Dark matter axions are hypothetical particles that could solve the dark matter puzzle.
  • Current experiments (cavity and dielectric haloscopes) face limitations in tuning axion and photon masses.
  • These limitations stem from breaking translational invariance, restricting device size and conversion efficiency.

Purpose of the Study:

  • To introduce a novel strategy for detecting dark matter axions using tunable cryogenic plasmas.
  • To overcome the limitations of existing haloscope designs.
  • To enable resonant conversion by matching axion mass to plasma frequency.

Main Methods:

  • Proposing a plasma haloscope that utilizes resonant conversion.
  • Employing wire metamaterials as a tunable plasma source.
  • Adjusting interwire spacing to tune the plasma frequency.

Main Results:

  • The plasma haloscope allows resonant conversion by matching axion mass to plasma frequency.
  • Plasma frequency is independent of device size, enabling larger conversion volumes.
  • Competitive sensitivity is estimated for axion masses in the 35–400 μeV range for realistic experimental scales.

Conclusions:

  • The plasma haloscope offers a promising new avenue for dark matter axion searches.
  • This technique provides a tunable and scalable method for detecting axions.
  • The proposed strategy could significantly advance the search for weakly interacting massive particles.