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6. Booster Free From Spin Resonance For Future 100~km-scale Circular e$^{+}$e$^{-}$ Colliders

Author

Chen, Tao, Duan, Zhe, Ji, Daheng, and Wang, Dou

Subjects
Physics - Accelerator Physics
Abstract

Acceleration of polarized electron~(positron) beams in a booster synchrotron may suffer from depolarization due to crossings of many spin depolarization resonances, which could limit its applications. We have studied the spin depolarization resonance structure of a 100~km scale booster lattice of the Circular Electron Positron Collider~(CEPC). The lattice has 8 arc regions with hundreds of FODO cells, interleaved with straight sections, which leads to a high periodicity. Our analysis shows the contributions to the strength of intrinsic and imperfection spin resonances add up coherently near the super strong resonances beyond 120 GeV, but mostly cancel out and result in generally weak resonance strengths at lower beam energies. Detailed simulations confirm that beam polarization can be mostly maintained in the fast acceleration to 45.6 GeV and 80 GeV, but severe depolarization may occur at even higher energies. This study suggests the possibility of acceleration of polarized electron~(positron) beams to ultra-high beam energies without the help of Siberian snakes, and supports injecting highly polarized beams into the collider rings as an attractive solution for resonant depolarization measurements and longitudinal polarized colliding beam experiments for future 100~km scale circular e$^{+}$e$^{-}$ colliders., Comment: 19 pages, 13 figures

Published
2023
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7. List of contributors

Author

Bao, Yongbo, primary, Chen, Liming, additional, Deng, Fujing, additional, Han, Yu, additional, Hou, Jing, additional, Huang, Lin, additional, Liu, Guangxu, additional, Liu, Hongxing, additional, Liu, Jindian, additional, Liu, Zhiquan, additional, Lv, Lu, additional, Shi, Wei, additional, Wang, Dou, additional, Wang, Yanhua, additional, Wang, Youji, additional, Yuan, Xia, additional, Zha, Shanjie, additional, Zhang, Hangjun, additional, Zhang, Miaolian, additional, Zhang, Weixia, additional, Zhong, Zhen, additional, and Zhou, Weishang, additional

Published
2024
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10. CEPC Cost Model Study and Circumference Optimization

Author

Wang, Dou, Gao, Jie, Ruan, Manqi, Li, Yuhui, Xu, Haocheng, Liu, Yudong, Li, Meng, Zhang, Yuan, Wang, Yiwei, Zhai, Jiyuan, and Zhou, Zusheng

Subjects
Physics - Accelerator Physics
Abstract

The CEPC is a proposed high luminosity Higgs/Z factory, with the potential to be upgraded to top factory at center-of-mass energy of 360GeV. We perform an optimization study on the circumference of CEPC. We calculate the instant luminosity, the construction and operation cost for different circumferences. With respect to the total cost and average cost per particle, we conclude that the optimal circumference for the CEPC Higgs operation is 80 km. Taking into account of the Z pole operation, the potential high-energy upgrade of CEPC (top factory), the optimal circumference increased to 100 km. The long future proton-proton upgrade of CEPC (SPPC) also favors a larger circumference, and we conclude that 100 km is the global optimized circumference for this facility.

Published
2022
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25. Class-Imbalanced and Fine-Grained Object Detection in Video Surveillance for Production Safety

Author

Zhou, Junliang, Ma, Kailang, Yang, Jie, Jiang, Zhaobiao, Chen, Jiayi, Wang, Dou, Ceccarelli, Marco, Series Editor, Agrawal, Sunil K., Advisory Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, Carbone, Giuseppe, editor, Laribi, Med Amine, editor, and Jiang, Zhiyu, editor

Published
2023
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26. Study of Aerodynamic Characteristics of Self-propelled Airfoils with Tandem Configuration

Author

Wang, Dou, Gao, Da, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Fu, Wenxing, editor, Gu, Mancang, editor, and Niu, Yifeng, editor

Published
2023
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