Development and vertical tests of 650 MHz 2-cell superconducting cavities with higher order mode couplers

Zheng, Hongjuan; Sha, Peng; Zhai, Jiyuan; Pan, Weimin; Li, Zhongquan; Mi, Zhenghui; He, Feisi; Zhang, Xinying; Dai, Jin; Han, Ruixiong; Ge, Rui

doi:10.1016/j.nima.2021.165093

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…However, the relative percentage is relatively large, which causes the error of some natural frequencies to exceed 10%. In terms of mode shape, the experimental and simulation results of the first six order modes are relatively consistent, and the results are generally acceptable [50, 51].…”

Section: Results and Analysismentioning

confidence: 99%

“…For example, Che et al. conducted vibration fatigue experiments and analysis on flip chip solder joints, and developed a quasi‐static finite element analysis method to study the stress–strain behaviour in the prediction of the solder joint vibration fatigue life, as shown in Figure 2 [21]. Bo Zhang et al.…”

Section: Literature Reviewmentioning

confidence: 99%

“…At present, many results have been achieved in the vibration analysis of the internal components of the chassis in many aspects such as soldering points, connectors, and PCBA. For example, Che et al conducted vibration fatigue experiments and analysis on flip chip solder joints, and developed a quasistatic finite element analysis method to study the stress-strain behaviour in the prediction of the solder joint vibration fatigue life, as shown in Figure 2 [21]. Bo Zhang et al constructed a finite element model for standard PCBA boards assembled in three chip sizes, and verified the analysis results through modal tests [22].…”

Section: Literature Reviewmentioning

confidence: 99%

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Vibration signal diagnosis and conditional health monitoring of motor used in biomedical applications using Internet of Things environment

Wang

Dai

Zhang

et al. 2022

The Journal of Engineering

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Vibration, especially basic vibration, may cause loose contacts, open circuits, or other contact problems, which account for a large proportion of system failure causes. Due to the complexity of the chassis structure used in the biomedical motors, the vibration analysis of a single component cannot solve the vibration problems encountered in the work of the system. Therefore, it is necessary to use system simulation and experiments to monitor and enhance the health of the structure. Finite element method is used to carry out the dynamic analysis from the component to the system, and calculate the natural frequency, modal shape and harmonic response. Then, the effectiveness and accuracy of the analysis results are verified by experiments through simulation and experiments. The results show that the measures taken have effectively reduced the vibration of the chassis equipment and improved its safety for better health safety of patients. There is just a 2% variation between the natural frequencies acquired from the experiment and the simulation computation. In terms of natural frequency, the first 6‐order natural frequencies all have errors of less than 10%, and the natural frequency error is comparable to that of fireproof board.

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Section: Results and Analysismentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Vibration signal diagnosis and conditional health monitoring of motor used in biomedical applications using Internet of Things environment

Wang

Dai

Zhang

et al. 2022

The Journal of Engineering

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“…CEPC will use two-cell 650 MHz cavities. Two coaxial HOM couplers with double-notch filters are installed on both sides of the cavity, as shown in Figure 7, with orientation optimized for best damping [55]. 240 such cavities will be installed for the Higgs operation.…”

Section: Higher-order Mode Damped Superconducting Radio Frequency Cav...mentioning

confidence: 99%

RF Technologies for Future Colliders

Belomestnykh

2022

Front. Phys.

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Particle colliders remain indispensable scientific instruments to discover and study new elementary particles and fundamental forces of nature. Whether the collider is a factory (used to improve precision of measuring properties of already discovered particles or to enable studies of rare decay channels), an energy frontier machine (aimed at discovering new particles and forces), a heavy ion collider (allowing studies of what the universe looked like in the early moments after its creation), or an electron-hadron collider (where electrons are used for probing heavy ions or protons to study the fundamental force binding all visible matter), the radio frequency technologies play a key role in enabling the machine to reach its goals. This article considers challenges presented to the radio frequency technologies by the next generation of particle colliders and reviews R&D approaches and directions to address these challenges.

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“…For low-frequency (<1 GHz) elliptical cavities used in colliders and proton/neutron sources [7][8][9], Q 0 usually decreases more quickly along with accelerating gradient than that of 1.3 GHz cavities. Nitrogen doping could increase Q 0 of 650 MHz single-cell β = 0.9 cavity for the Proton Improvement Plan II (PIP-II) project to 7 × 10 10 at medium fields of approximately 15-25 MV/m [7].…”

Section: Introductionmentioning

confidence: 99%

Quality Factor Enhancement of 650 MHz Superconducting Radio-Frequency Cavity for CEPC

et al. 2022

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Medium-temperature (mid-T) furnace baking was conducted at 650 MHz superconducting radio-frequency (SRF) cavity for circular electron positron collider (CEPC), which enhanced the cavity unloaded quality factor (Q0) significantly. In the vertical test (2.0 K), Q0 of 650 MHz cavity reached 6.4 × 1010 at 30 MV/m, which is remarkably high at this unexplored frequency. Additionally, the cavity quenched at 31.2 MV/m finally. There was no anti-Q-slope behavior after mid-T furnace baking, which is characteristic of 1.3 GHz cavities. The microwave surface resistance (RS) was also studied, which indicated both very low Bardeen–Cooper–Schrieffer (BCS) and residual resistance. The recipe of cavity process in this paper is simplified and easy to duplicate, which may benefit the SRF community.

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Development and vertical tests of 650 MHz 2-cell superconducting cavities with higher order mode couplers

Cited by 8 publications

References 7 publications

Vibration signal diagnosis and conditional health monitoring of motor used in biomedical applications using Internet of Things environment

Vibration signal diagnosis and conditional health monitoring of motor used in biomedical applications using Internet of Things environment

RF Technologies for Future Colliders

Quality Factor Enhancement of 650 MHz Superconducting Radio-Frequency Cavity for CEPC

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