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2. Beam distribution reconstruction simulation for electron beam probe

Author

Feng, Yongchun, Mao, Ruishi, Li, Peng, Kang, Xincai, Yin, Yan, Liu, Tong, You, Yaoyao, Chen, Yucong, Zhao, Tiecheng, Xu, Zhiguo, Wang, Yanyu, and Yuan, Youjin

Subjects
Physics - Accelerator Physics
Abstract

Electron beam probe (EBP) is a new principle detector, which makes use of a low-intensity and low-energy electron beam to measure the transverse profile, bunch shape, beam neutralization and beam wake field of an intense beam with small dimensions. While can be applied to many aspects, we limit our analysis to beam distribution reconstruction. This kind of detector is almost non-interceptive for all of the beam and does not disturb the machine environment. In this paper, we present the theoretical aspects behind this technique for beam distribution measurement and some simulation results of the detector involved. First, a method to obtain parallel electron beam is introduced and a simulation code is developed. And then, EBP as a profile monitor for dense beam is simulated using fast scan method under various target beam profile, such as KV distribution, waterbag distribution, parabolic distribution, Gaussian distribution and halo distribution. Profile reconstruction from the deflected electron beam trajectory is implemented and compared with the actual one, and an expected agreement is achieved. Furthermore, Instead of fast scan, a slow scan, i.e. step-by-step scan, is considered, which lows the requirement for hardware, i.e. Radio Frequency deflector. we calculate the three dimensional electric field of Gaussian distribution and simulate the electron motion under this field. In addition, fast scan along the target beam direction and slow scan across the beam is also presented, and can provide a measurement of longitudinal distribution as well as transverse profile simultaneously. Final, simulation results for China Accelerator Driven Sub-critical System (CADS) and High Intensity Heavy Ion Accelerator Facility (HIAF) are given to investigate the quantitative behavior of EBP., Comment: 13 pages, 21 figures

Published
2016
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6. The Frequency Effect of the Motor Imagery Brain Computer Interface Training on Cortical Response in Healthy Subjects: A Randomized Clinical Trial of Functional Near-Infrared Spectroscopy Study

Author

Lin, Qiang, primary, Zhang, Yanni, additional, Zhang, Yajie, additional, Zhuang, Wanqi, additional, Zhao, Biyi, additional, Ke, Xiaomin, additional, Peng, Tingting, additional, You, Tingting, additional, Jiang, Yongchun, additional, Yilifate, Anniwaer, additional, Huang, Wei, additional, Hou, Lingying, additional, You, Yaoyao, additional, Huai, Yaping, additional, Qiu, Yaxian, additional, Zheng, Yuxin, additional, and Ou, Haining, additional

Published
2022
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7. Synergistic Immediate Cortical Activation on Mirror Visual Feedback Combined With a Soft Robotic Bilateral Hand Rehabilitation System: A Functional Near Infrared Spectroscopy Study

Author

Qiu, Yaxian, primary, Zheng, Yuxin, additional, Liu, Yawen, additional, Luo, Wenxi, additional, Du, Rongwei, additional, Liang, Junjie, additional, Yilifate, Anniwaer, additional, You, Yaoyao, additional, Jiang, Yongchun, additional, Zhang, Jiahui, additional, Chen, Aijia, additional, Zhang, Yanni, additional, Huang, Siqi, additional, Wang, Benguo, additional, Ou, Haining, additional, and Lin, Qiang, additional

Published
2022
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14. Endo-Selective Construction of Spiro-[butyrolactone-pyrrolidine] via Ag(I)/CAAA-Amidphos-Catalyzed 1,3-Dipolar Cycloaddition between Azomethine Ylides and α-Methylene-γ-Butyrolactone.

Author

Hou, Qinglin, You, Yaoyao, Song, Xinluo, Wang, Yingxia, Chen, Ke, and Wang, Haifei

Subjects
*PYRROLIDINE synthesis, *SCHIFF bases, *YLIDES, *RING formation (Chemistry), *ORGANIC synthesis, *ISOXAZOLIDINES, *CONSTRUCTION
Abstract

Construction of spirocyclic pyrrolidines bearing a spiro quaternary stereocenter is an enormous challenge in synthetic organic chemistry. In this report, we introduce a Ag(I)/CAAA-amidphos-catalyzed enantioselective 1,3-dipolar cycloaddition between azomethine ylides and α-methylene-γ-butyrolactone as an effective strategy for the construction of excellent endo-selective spiro-[butyrolactone-pyrrolidine] derivatives. Meanwhile, the catalytic system was also successfully applied in the three-component one-pot reaction of azomethine ylides formed in situ under the action of N,N′-diisopropylcarbodiimide serving as a dehydrator. Under the optimal conditions, endo-pyrrolidine derivatives bearing a spiro quaternary stereocenter were obtained with high to excellent yields (up to 95% yield) and enantioselectivities (up to 93% ee). [ABSTRACT FROM AUTHOR]

Published
2020
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