| abstract |
A synchrotron type accelerator including a deflecting electromagnet arranged on a circulating orbit of a charged particle beam, four-pole divergence electromagnets and four-pole convergence electromagnets arranged on said circulating orbit. A high frequency applying unit arranged on the circulating orbit for applying a high frequency electromagnetic field to the charged particle beam circulating and for increasing an amplitude of betatron oscillation of the particle beam to a level above a stability limit of resonance. A first deflector for beam ejection arranged on the circulating orbit for deflecting the charged particle beam excited above the stability limit of the resonance by the high frequency applying unit and a second deflector for beam ejection arranged on the circulating orbit used in pairs with the first deflector for beam ejection for introducing the charged particle beam deflected by the first deflector for beam ejection into an ejected beam transporting system. The deflecting electromagnet and the second deflector for beam ejection are arranged in this order at downstream with respect to the first deflector for beam ejection, and the four-pole divergence electromagnets are arranged at downstream with respect to the first deflector for beam ejection and upstream with respect to the deflecting electromagnet and at downstream with respect to the deflecting electromagnet and upstream with respect to the second deflector for beam ejection. |