Zobrazeno 1 - 10
of 174
pro vyhledávání: '"QiKa Jia"'
Autor:
Haoran Zhang, Cheng Li, Zixin Guo, Xiazhen Xu, Jingya Li, Biaobin Li, Zhigang He, Shancai Zhang, Qika Jia
Publikováno v:
IEEE Photonics Journal, Vol 15, Iss 4, Pp 1-8 (2023)
Ultrashort terahertz (THz) beam is often affected by spatio-temporal distortion due to its long wavelength, and this spatio-temporal coupling will degrade the focusing effect. Here, we develop a numerical model for calculating the vector focusing of
Externí odkaz:
https://doaj.org/article/e5bc484b4a6948a8b3b17171bcc923e5
Narrowband Terahertz Emission With Tunable Orbital Angular Momentum by Vortex Laser-Beam Interaction
Autor:
Haoran Zhang, Wenxing Wang, Cheng Li, Zixin Guo, Zhigang He, Shancai Zhang, Qika Jia, Lin Wang
Publikováno v:
IEEE Photonics Journal, Vol 14, Iss 1, Pp 1-8 (2022)
Terahertz vortex beams need to be developed for supporting new applications in fundamental sciences. In this paper, a novel and feasible scheme is presented for generation of helically microbunched electron beam for the emission of terahertz (THz) vo
Externí odkaz:
https://doaj.org/article/d4b3b19e3a344ac9b7b5d24cd391fe89
Publikováno v:
Physical Review Accelerators and Beams, Vol 26, Iss 7, p 070701 (2023)
Undulator tapering based on a prebunched electron beam and a strong seed laser has been demonstrated as a promising method to greatly enhance free-electron laser (FEL) efficiency and suppress sideband instability. Different from the former works that
Externí odkaz:
https://doaj.org/article/7e779f9edbaa40fe817d7c794f9322f2
In the particle acceleration by stimulated emission of radiation (PASER), the efficient interaction occurs when a train of micro-bunches whose periodicity being identical to the resonance frequency of the medium. The previous theoretical calculations
Externí odkaz:
http://arxiv.org/abs/1412.5354
Autor:
Heting, Li, Qika, Jia
We put forward a method to optimize the step-tapering amplitude of undulator strength and initial energy detuning of electron beam with the goal of maximizing the saturation power of high-gain FELs, based on the physics of longitudinal electron beam
Externí odkaz:
http://arxiv.org/abs/1402.7123
Publikováno v:
New Journal of Physics, Vol 25, Iss 1, p 013024 (2023)
We propose an all-optical technique to record the time information of relativistic electron beams with sub-optical-cycle duration. The technique is based on the interaction of the electron beam with the ponderomotive potential of an optical traveling
Externí odkaz:
https://doaj.org/article/3aa97ed9ba274a8284196ef6f39666dd
Autor:
Qika, Jia
A simple analysis is given for optimum length of undulator in self-seeding free electron laser (FEL). The obtained relations show the correlation between the undulator length and the system parameters. The power required for the seeding in the second
Externí odkaz:
http://arxiv.org/abs/1310.2692
Publikováno v:
IEEE Photonics Journal, Vol 11, Iss 1, Pp 1-7 (2019)
The filtering and polarizing of terahertz waves are essential for various terahertz applications. Here, we use two-dimensional (2-D) rectangular subwavelength hole arrays (SHAs) to achieve efficient wave filtering and polarizing in the terahertz regi
Externí odkaz:
https://doaj.org/article/003e50b81662439baa05c2cad451c79e
Publikováno v:
IEEE Transactions on Electron Devices. 70:3308-3314
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1adb90838c4051fb0beef7d5b73c4e8c
https://doi.org/10.1109/ted.2023.3268254
https://doi.org/10.1109/ted.2023.3268254
Publikováno v:
IEEE Transactions on Electron Devices. 70:2514-2520
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7ba5aa9f9171e4a1b4385eafb6a26490
https://doi.org/10.1109/ted.2023.3253099
https://doi.org/10.1109/ted.2023.3253099