Quantum field action effect on radiation cooling and cyclotron maser cooling of particle beams

The 'quantum field action effect' on radiation cooling is indicated. Under a stimulating radiation field below the quantum field action any oscillator system is non-radiative. However, under the stimulating quantum field action, a macroscopic quantum jump to the radiative system takes place leading to its cooling toward a stable state irrespective of photon emission mode. The macroscopic jump was observed in experiments on the new particle beam cooling scheme 'cyclotron maser cooling' (CMC). Under a stimulating field below the critical value prescribed by an action time a beam of gyrating electrons obeyed the Liouville theorem. However, when the field reached the critical value, the beam abruptly jumped to a critical point of radiative system undergoing CMC, where all electrons accumulated at one discrete energy within some 10 ns. While, for a fine excess of the field over the critical value, coherent energy modulation took place in gyrations. (C) 1997 Elsevier Science B.V.