CHARGED PARTICLE ACCELERATOR AND COOLING METHOD FOR CHARGED PARTICLE BEAM.

摘要

The particle acceleration has an additional cavity disposed separately from a radio frequency acceleration cavity on the orbit of charged particles of an annular accelerator and there are also disposed an external oscillator for exciting a radio frequency electromagnetic field inside the additional cavity and a coupling antenna. A deflection mode which has a field component at the beam duct portion fo the dditional cavity through which the cahrged particles pass in the centre orbit direction of the charged particles and generates a magnetic field on a centre orbit of the charged particles in the direction perpendicular to the center orbit plane is excited in the cavity, using the external oscillator and the coupling antenna. The resonance frequency of the deflection mode is set to integer multiples of that of the fundamental radio frequency mode in the radio frequency acceleration cavity. The pahse relation bet between the radio frequency acceleration cavity and the cavity is set so that when the phase of the radio frequency electric field intensity of the radio frequency acceleration cavity is 0, the radio frequency magnetic field intensity of the cavity rises in the same phase. advantage - Beam loss is minimised.