A radio-frequency type charged particle accelerator includes a RFQ accelerator and a rear stage RF accelerator both of which are contained in a single evacuated chamber. The RFQ accelerator has quadrupole electrodes positioned along a traveling path of the charged particle and bunches and accelerates...http://www.google.com.hk/patents/US5825140?utm_source=gb-gplus-share專利 US5825140 - Radio-frequency type charged particle accelerator
