A new linear accelerating structure SFRFQ was proposed to transfer the RFQ inter-vane voltage to the inter-longitudinal accelerating gap voltage so as to improve the acceleration efficiency.A SFRFQ prototype is being ...A new linear accelerating structure SFRFQ was proposed to transfer the RFQ inter-vane voltage to the inter-longitudinal accelerating gap voltage so as to improve the acceleration efficiency.A SFRFQ prototype is being constructed to explore its feasibilities,which will be installed behind the 1MeV ISR RFQ and accelerates the O^+ beam from 1MeV to 1.6MeV.A high power SFRFQ model cavity was designed and tested,which has proved that an accelerating voltaire higher than 70kV could be applied.A magnetic triplet matching section was designed to realize the beam matching between 1MeV ISR RFQ and SFRFQ.The upgrading of 1MeV ISR RFQ has been carried out smoothly, and its output beam current has reached 2mA.展开更多
SFRFQ （Separated Function Radio Frequency Quadrupoles） accelerator is a new post accelerator of RFQ （Radio Frequency Quadrupoles） type, which has been developed since the beginning of the 1990s at Peking Universit...SFRFQ （Separated Function Radio Frequency Quadrupoles） accelerator is a new post accelerator of RFQ （Radio Frequency Quadrupoles） type, which has been developed since the beginning of the 1990s at Peking University. In order to demonstrate the possibility of the SFRFQ, a prototype cavity has been designed. A special dynamics design method has been proposed to avoid the sparking problem and decrease the energy spread at the exit of SFRFQ. It consists of two aspects： the asymmetry structure design for transverse focusing and the inner buncher design for longitudinal bunching. This allows the improvement of the beam properties without increasing the cavity length. The simulation results show that the energy spread can be substantially reduced by using the inner buncher in the SFRFQ structure.展开更多
文摘A new linear accelerating structure SFRFQ was proposed to transfer the RFQ inter-vane voltage to the inter-longitudinal accelerating gap voltage so as to improve the acceleration efficiency.A SFRFQ prototype is being constructed to explore its feasibilities,which will be installed behind the 1MeV ISR RFQ and accelerates the O^+ beam from 1MeV to 1.6MeV.A high power SFRFQ model cavity was designed and tested,which has proved that an accelerating voltaire higher than 70kV could be applied.A magnetic triplet matching section was designed to realize the beam matching between 1MeV ISR RFQ and SFRFQ.The upgrading of 1MeV ISR RFQ has been carried out smoothly, and its output beam current has reached 2mA.
基金Supported by National Natural Science Foundation of China (10455001)China Postdoctoral Science Foundation
文摘SFRFQ （Separated Function Radio Frequency Quadrupoles） accelerator is a new post accelerator of RFQ （Radio Frequency Quadrupoles） type, which has been developed since the beginning of the 1990s at Peking University. In order to demonstrate the possibility of the SFRFQ, a prototype cavity has been designed. A special dynamics design method has been proposed to avoid the sparking problem and decrease the energy spread at the exit of SFRFQ. It consists of two aspects： the asymmetry structure design for transverse focusing and the inner buncher design for longitudinal bunching. This allows the improvement of the beam properties without increasing the cavity length. The simulation results show that the energy spread can be substantially reduced by using the inner buncher in the SFRFQ structure.
