Qianqian Su

Qianqian Su
University of California, Los Angeles | UCLA · Department of Electrical Engineering

Master of Engineering

About

7
Publications
1,037
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63
Citations

Publications

Publications (7)
Article
Due to the highly nonlinear nature of the beam-loading, it is at present not possible to analytically determine the beam parameters needed in a two-bunch plasma wakefield accelerator for maintaining a low energy spread. Therefore in this paper, by using the Broyden-Fletcher–Goldfarb–Shanno algorithm for the parameter scanning with the code QuickPIC...
Preprint
Plasma wakefield acceleration shows a great potential for applications in future light sources and linear electron-positron colliders, in which trailing beams are required to be optimally loaded to maintain a low energy spread while extracting energy efficiently from the wake during the acceleration. Due to the highly nonlinear nature of this effec...
Preprint
We propose a novel positron beam loading regime in a hollow plasma channel that can efficiently accelerate $e^+$ beam with high gradient and narrow energy spread. In this regime, the $e^+$ beam coincides with the drive $e^-$ beam in time and space and their net current distribution determines the plasma wakefields. By precisely shaping the beam cur...
Article
Full-text available
Availability of relativistically intense, single-cycle, tunable infrared sources will open up new areas of relativistic nonlinear optics of plasmas, impulse IR spectroscopy and pump-probe experiments in the molecular fingerprint region. However, generation of such pulses is still a challenge by current methods. Recently, it has been proposed that t...
Conference Paper
We demonstrate that relativistic, single-cycle infrared pulses tunable in the spectral range of 3-19 μm can be generated from a tailored plasma structure using an 810 nm drive laser.
Article
Full-text available
The availability of intense, ultrashort coherent radiation sources in the infrared region of the spectrum is enabling the generation of attosecond X-ray pulses via high harmonic generation, pump-probe experiments in the "molecular fingerprint" region and opening up the area of relativistic-infrared nonlinear optics of plasmas. These applications wo...
Article
Full-text available
Femtosecond electron bunches with complex temporal structures play a crucial role in THz gene- ration, free-electron lasers and plasma wakefield accelerators. The ultrashort electron pulse duration can be reconstructed from the coherent transition radiation (CTR) spectrum based on prior kno- wledge. A weighted greedy sparse phase retrieval (WGESPAR...

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