The driver accelerator of the RAON is a superconducting linear accelerator consisting of low beta cavities. Studies of various failure modes are performed through extensive machine imperfection studies. It is found that the linac is tolerant of any single superconducting cavity loss except the first nine upstream QWR cavities. Studies also find that the linac design is tolerant of 10% upstream-section cavity failure with the design-beta cavities. It is also found that in case of 10% cavity failure, orbit correction becomes indispensable. On the other hand, if cavity betas of the HWR and the SSR2 increase by 4% from the design values, the linac beam loss starts to increase rapidly, when 10% upstream-section cavities become inoperable. This paper shows quantitatively that significant beam losses can be caused in case of cavity faults, when the exit energy of the upstream section is not high enough. In case of a quadrupole doublet failure in the QWR section, beam loss of about 70 W/m is generated in the immediate downstream and beam operation is not feasible.

RAON的驱动器加速器是由低β腔组成的超导线性加速器。通过广泛的机器缺陷研究对各种故障模式进行研究。发现，线性加速器可以承受除前九个上游QWR腔以外的任何单个超导腔损耗。研究还发现，直线加速器设计可承受设计beta型腔10％的上游截面腔破坏。还发现在10％的腔破坏的情况下，轨道校正变得必不可少。另一方面，如果HWR和SSR2的空腔beta比设计值增加4％，则当10％的上游截面空腔无法使用时，直线加速器光束损失开始迅速增加。本文定量地表明，在发生腔室故障的情况下，可能会导致明显的光束损失，当上游部分的出口能量不够高时。如果在QWR部分发生四极双峰故障，则在紧邻的下游会产生约70 W / m的光束损耗，并且光束操作不可行。