Development of the MHz repetition bipolar pulse induction acceleration system
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摘要: 采用感应同步加速原理，能在MHz重复频率下连续运行的双极性脉冲感应加速单元可以替代传统的射频加速单元应用于环形加速器中。针对MHz重频双极性脉冲功率源设计、感应腔负载特性等关键技术开展了实验研究，研制了一套MHz重频双极性脉冲感应加速单元。相比于日本高能加速器研究机构（KEK）研制的感应同步加速单元，该加速单元对电路结构进行了优化， 在加速脉冲具备相同顶降的前提下，将加速腔纵向尺寸缩小了5倍以上，可有效改善现有脉冲感应加速单元在加速电压调节方面的局限性，提高了功率系统的稳定性，减小了组元连续运行时的功率损耗，更加适应各类环形加速器对重频脉冲感应加速组元的应用需求。Abstract: Based on the principle of Induction Synchrotron (IS), the high-repetition pulse induction acceleration module can replace the radio frequency acceleration cavity in circular accelerators, thereby obtaining more application prospects. In this paper, a set of MHz continuous repetition bipolar pulse induction acceleration module suitable for IS is developed, and its circuit design and experimental results are introduced. Compared with the induction acceleration module of KEK, which is the only IS acceleration module in use at present, this induction module adopts different circuit structures to make the longitudinal dimension of the induction cell be reduced by 5 times at the same pulse flat voltage drop, which can effectively improve the adjustment ability of the accelerating voltage in a limited space, reduce the power consumption and the cost of system cooling, and improve the reliability of continuous operation of the pulse power system.
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图 1 KEK的双极性脉冲感应加速单元
Figure 1. The bipolar pulse induction acceleration system of KEK-IS
图 4 不同版本全桥电路在30 Ω电阻上获得的双极性脉冲波形
Figure 4. Bipolar pulse waveform on 30 Ω resistor obtained by different version of full bridge circuit
图 5 MHz重频双极性脉冲功率源组成
Figure 5. The components of the bipolar pulse power source for MHz repetition rate
图 6 两种双极性脉冲感应腔结构和尺寸对比
Figure 6. The structures and dimensions of the two kinds of induction cells
图 7 感应腔的电压电流波形及磁芯磁化曲线
Figure 7. The induction voltage and the exciting current of the acceleration cell and the B-H curve of the magnetic cores
图 8 感应腔的腔压脉冲波形及等效电阻
Figure 8. The induction voltage pulse waveform and equivalent resistance curve of the induction cell
图 9 可连续重频运行的双极性脉冲功率源
Figure 9. The components of the bipolar pulse power source for MHz continuous operation
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