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基于超导器的连续波运行的高流强质子/氘束被越来越多的大科学装置所采用。在流强低于10mA情况下,用于加速低β段粒子的超导腔的高阶模影响基本可以忽略,但是对于加速百mA强流的低β超导腔,其高阶模损耗情况有待研究。近期北京大学设计并加工了一支β=0.09、运行频率162.5 MHz的超导半波长谐振腔,用于研究非相对论低β超导半波长谐振腔加速100mA强流质子束时可能涉及到的关键物理问题。重点研究了这支半波长谐振腔内部高阶模损耗的问题,用时域和频域两种方法分别计算了腔的高阶模损失因子,同时计算了考虑加工误差下腔内发生高阶模共振激发的概率。
High-flow proton / deuterium beams based on continuous wave operation of superconductors are used by more and more large scientific devices. The high-order mode effects of superconducting cavities for accelerating low-β particles are negligible when the flow rate is lower than 10mA. However, the high-order modes loss of low-β superconducting cavities for accelerating a hundred mA of intense current remains to be studied. Recently, Peking University designed and fabricated a superconducting half-wavelength cavity with β = 0.09 and an operating frequency of 162.5 MHz to study the key issues that may be involved in accelerating a 100mA intense proton beam with a non-relativistic low-β superconducting half-wavelength cavity Physical problems. The high-order mode loss in the half-wavelength cavity was studied emphatically. The high-order mode loss factor of the cavity was calculated by time-domain method and frequency-domain method respectively. The probability of high-order mode resonance excitation in the cavity was calculated considering the processing error.