Superconducting technologies are widely used in modern radiofrequency (RF) cavities for particle accelerators in various fields of applications. The Superconducting radiofrequency (SCRF) cavities are highly sensitive to small perturbation on cavity dimensions. The operation of the superconducting cavity becomes challenging due to narrow resonance bandwidth on account of a very high-quality factor. The main perturbing source is Lorentz Force acting on the cavity wall, which detunes the cavity from resonance. Finite element (FE) analysis has an important role in Lorentz force detuning (LFD) estimation, which requires coupled-field FE analysis between the structural and RF domains of the cavity. The LFD effect can be mitigated up to a certain extent by using a proper fast tuning methodology. This paper represents the methodology for structural-high frequency electromagnetic coupled field simulation for LFD calculation of 650MHz, βg=0.92 single-cell SCRF cavity. First, the static LFD is calculated for various voltage gradients of SCRF cavity structure and then dynamic behavior of cavity due to LFD pressure pulse is studied at different pulse widths (PW) and pulse repetition rates (PRR). A comparison of transient FE analysis of the single-cell cavity with one end fixed and another end free and cantilever beam for similar loading is done for benchmarking. To counter the detuning effect, the SCRF cavity employs a piezo tuning device. The dynamic behavior of piezo pulse response on the cavity is also studied. An experimental test of the piezo tuner system has been performed at room temperature to validate the FE coupled simulation. Further, dynamic analysis has been carried for the combined effect of LFD pressure and piezo load pulse to compensate for the LFD effect. Optimizing the piezo load for compensating the frequency shift is also discussed and based on optimum load, LFD has been mitigated for different acceleration gradients.

超导技术广泛用于各种应用领域的粒子加速器的现代射频 (RF) 腔。超导射频 (SCRF) 腔体对腔体尺寸的小扰动高度敏感。由于非常高的品质因数，由于谐振带宽窄，超导腔的操作变得具有挑战性。主要的扰动源是作用在腔壁上的洛伦兹力，它使腔与共振失谐。有限元 (FE) 分析在洛伦兹力失谐 (LFD) 估计中具有重要作用，这需要在腔的结构域和 RF 域之间进行耦合场 FE 分析。通过使用适当的快速调谐方法，可以在一定程度上减轻 LFD 效应。βg=0.92 单细胞 SCRF 腔。首先，计算 SCRF 腔结构的各种电压梯度的静态 LFD，然后研究由于 LFD 压力脉冲在不同脉冲宽度 (PW) 和脉冲重复率 (PRR) 下的腔动态行为。对具有一端固定和另一端自由和悬臂梁的单单元腔的瞬态有限元分析进行比较，以进行类似的加载以进行基准测试。为了抵消失谐效应，SCRF 腔体采用了压电调谐装置。还研究了压电脉冲响应对腔的动态行为。在室温下对压电调谐器系统进行了实验测试，以验证 FE 耦合模拟。此外，对 LFD 压力和压电负载脉冲的组合效应进行了动态分析，以补偿 LFD 效应。