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We have shown a new production mechanism of radiations produced by darkmatter axion $a(t)$ under strong magnetic field $B$. The axion generatesoscillating electric current in the surface of conductor. The current isextremely enhanced such as $J_c=(m_a\delta_e)^{-2}J_a$ compared with vacuumcurrent $J_a\equiv g_{a\gamma\gamma}\partial_t a(t)B$; $\delta_e$ is skin depthand axion mass $m_a$. We have shown that sufficiently strong radiation isemitted by cylindrical super ( normal ) conductor to be easily detected. Then,we naively expect that such strong radiation also arises in resonant cavityexperiment. But we show that the expectation is wrong. The radiation generatedin the cavity is just the one given in the standard estimation, even if weconsider the enhanced current in the conductor of the cavity. This is becausethe radiation in the cavity is standing wave, while the radiation emitted fromthe cylindrical conductor is outgoing wave. For simplicity we considerradiation arising in the space between two parallel flat conductors.

Radiation Production by Axion in Space between Two Flat Conductors