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axions, the intensity of the microwave radiation generated by axion-photon
conversion of decays is determined by the probability of these decay
processes that depend on the magnetic field created by the superconducting
solenoids. Experimental monitoring of axion-photon conversion will allow
to estimate the probability of such processes and answer the question about
the possibility of axion generation in a laboratory setting.
Conclusion.
The ways of optimization of experimental setups for
detecting “hot” and “cold” axions, assumed to be the elementary particles
of the dark matter have been proposed. To generate “hot” axions pulsed
sources of the laser radiation are suggested to be used, with high spectral
intensity of the radiation in the visible or ultraviolet ranges. It provides
a transition from spontaneous axion-photon conversion to stimulated
processes similar to light SCS processes. The expected axion rest mass
corresponds to the microwave spectral region 0.001. . . of 1.0MeV. A
highly sensitive spectrum analyzer based on the Josephson non-stationary
effect is proposed as a detector of microwave photons generated by the
decay of “cold” axions. To increase the intensity of microwave radiation
resulting from the axion-photon conversion into the microwave cavity, it
is proposed to introduce metamaterials or photon crystals that slow down
the microwave photons to velocities significanly lower than the speed
of light. The increase of the microwave radiation intensity is stipulated
by the increase of the relating photon states while the group velocity of
microwave photons becomes significantly lower than the speed of light in
vacuum (
v c
) [29-32]. As a medium that slows down microwave photons
arising from the axion-photon conversion in the cavity we proposed to use
the folloing: globular photon crystals [30–32] with a forbidden band in
the microwave range; metamaterials with a negative refractive index and
a low group velocity of the electromagnetic waves; ferroelectrics with a
high-Q soft mode, etc.
The paper has been supported by the Russian Foundation for Basic
Research (RFBR) (Grants 12-02-00491, 12-02-90422, 12-02-90021,
12-02-90025, 13-02-00449, 13-02-90420, 14-02-00190).
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