  We report the first experimental evidence of a controlled transition from the
generation of periodic bursts of electromagnetic emission into continuous wave
regime of a cyclotron maser formed in magnetically confined non-equilibrium
plasmas. The kinetic cyclotron instability of the extraordinary wave of weakly
inhomogeneous magnetized plasma is driven by the anisotropic electron
population resulting from electron cyclotron plasma heating in MHD-stable
minimum-B open magnetic trap.
