3篇
您的检索式：作者名="LU Changwang"
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| 1 | Simulation of higher order modes and loss factor of a new type of 500-MHz single cell superconducting cavity at SSRF显示文摘In this paper,higher order modes(HOMs) and loss factor of a new type of 500-MHz superconducting cavity is studied,by simulating its broadband HOMs damping at different positions of the ferrite HOM-absorber and different lengths of the ferrite.The results show that the impedance and Q value of the HOMs in transverse and longitudinal modes could be greatly reduced.The HOM longitudinal impedance could be damped to meet the requirement of SSRF beam instability threshold.The calculated loss factor of the new SC cavity was compared with cavities at SSRF.It was estimated that the HOM absorber could absorb a total power of 3.16 kW at 4-mm beam bunch length. | YU Haibo LIU Jianfei HOU Hongtao LU Changwang WEI Yelong MA Zhenyu FENG Ziqiang MAO Dongqing | 2011 | Nuclear Science and Techniques2011，22，5： | 1 |
| 2 | Design of large aperture 500 MHz 5-cell superconducting cavity显示文摘With the potential application of Energy Recovery Linac (ERL), the superconducting (SC) cavities were developed to deliver much higher current than before. Nowadays, the current of the international SC accelerator designed has already exceeded 100 mA. This paper presents the design of a new 500 MHz 5-cell SC cavity (SINAP 5-cell cavity), in which the parameters r/Q= 515.5 of the fundamental mode and the geometry factor G=275.8 are under an acceptable Radio Frequency (RF) field level (B peak /E acc =4.31 mT/MV/m and E peak /E acc =2.48). This design employs a larger beam pipe to propagate the Higher Order Modes (HOMs) out of the cavity and increases the damping efficiently for the dangerous HOMs. By simulation technique, it has been found that almost all the dangerous HOMs (including TE 111 , TM 110 , and TM 011 ) can be propagated into the beam pipe and are absorbed by ferrite absorbers, when the beam pile is enlarged. Finally, the loss factor for the new 5-cell cavity is also calculated. | WEI Yelong LIU Jianfei HOU Hongtao MA Zhenyu MAO Dongqing FENG Ziqiang LU Changwang YU Haibo | 2012 | Nuclear Science and Techniques2012，23，5： | 0 |
| 3 | Crystallographic Characterization of Lu_(2)O@C_(s)(6)-C_(82)and Er_(2)O@C_(s)(6)-C_(82):The Role of Metal Species on Cluster Configuration显示文摘Comprehensive Summary Intramolecular interactions are fundamental for the unique structures and outstanding properties of metallofullerenes.However,how the internal metal species interplay with the cluster configuration inside oxide clusterfullerenes remains poorly understood.Herein,we successfully captured two oxide clusterfullerenes with different metals,namely,Lu_(2)O@C_(82)and Er_(2)O@C_(82),to elucidate the role of metal species in tuning cluster configuration.The two molecules have been fully characterized by mass spectrometry,Vis-NIR absorption spectroscopy,cyclic voltammetry,and single-crystal X-ray diffraction. | Pengwei Yu Haocheng Mei Shuaifeng Hu Changwang Pan Wangqiang Shen Pengyuan Yu Kun Guo Yunpeng Xie Takeshi Akasaka Lipiao Bao Xing Lu | 2023 | Chinese Journal of Chemistry2023，41，16： | 0 |
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