An approach to characterize Lorentz force transfer function for superconducting cavities

doi:10.1016/j.nima.2021.165633

	An approach to characterize Lorentz force transfer function for superconducting cavities
	Qiu, Feng 1,2,3,4; Zhu, Zhenglong 1; Ma, Jinying 1,4; Jiang, Tiancai 1; Xue, Zongheng 1; Gao, Zheng 1; Chen, Qi 1; Xu, Chengye 1,4; Huang, Guirong 1,4; He, Yuan 1,4
刊名	NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
	2021-10-01
卷号	1012 页码:7
关键词	LLRF Lorentz force detuning Superconducting Ponderomotive
ISSN号	0168-9002
DOI	10.1016/j.nima.2021.165633
通讯作者	Qiu, Feng(qiufeng@impcas.ac.cn) ; He, Yuan(hey@impcas.ac.cn)
英文摘要	Superconducting radio-frequency (SRF) cavities are preferred in many modern accelerator facilities to reduce the operation cost of the RF power systems. SC cavities are usually sensitive to small mechanical perturbations because of their narrow bandwidth. These perturbations such as microphonics and Lorentz force detuning (LFD) can significantly detune the SRF cavity and therefore not only deteriorate the cavity field stabilities but also increase the RF power requirements. Piezo-electric actuators are widely adopted to suppress the cavity detuning caused by LFD and microphonics. Many advanced detuning compensation strategies were proposed to suppress the microphonics and LFD in recent years. The dynamic models of the LFD and piezo actuator are essential in these activities. Generally, the models of LFD can be identified by modulating the cavity field with sinusoidal signals and then measuring the corresponding steady-state amplitude and phase response of the cavity. However, for some SRF cavities, the cavity field may becomes unstable because of the presence of the ponderomotive effects, leading to a unacceptable measurement result. We present a new approach to identify the dominant modes of the LFD model based on a grey-box models estimation method. The validity of the approach was demonstrated by comparing the model output and measurement results on SRF cavities of real accelerator facilities.
WOS研究方向	Instruments & Instrumentation ; Nuclear Science & Technology ; Physics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000713695900003
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/139951]
专题	中国科学院近代物理研究所
通讯作者	Qiu, Feng; He, Yuan
作者单位	1.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 2.Grad Univ Adv Studies, Hayama, Kanagawa 2400193, Japan 3.High Energy Accelerator Res Org, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan 4.Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qiu, Feng,Zhu, Zhenglong,Ma, Jinying,et al. An approach to characterize Lorentz force transfer function for superconducting cavities[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2021,1012:7.
APA	Qiu, Feng.,Zhu, Zhenglong.,Ma, Jinying.,Jiang, Tiancai.,Xue, Zongheng.,...&Miura, Takako.(2021).An approach to characterize Lorentz force transfer function for superconducting cavities.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,1012,7.
MLA	Qiu, Feng,et al."An approach to characterize Lorentz force transfer function for superconducting cavities".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 1012(2021):7.