A5012347895- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Laser-Matter Interactions and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray and CT Imaging
- Plasma Diagnostics and Applications
- Advanced Fiber Laser Technologies
- Medical Imaging Techniques and Applications
- Laser Design and Applications
- Radiation Dose and Imaging
- Advanced X-ray Imaging Techniques
- Laser-induced spectroscopy and plasma
- Seismic Imaging and Inversion Techniques
- Radiation Detection and Scintillator Technologies
- Cyclopropane Reaction Mechanisms
- Molecular Junctions and Nanostructures
- Geoscience and Mining Technology
- Nuclear Physics and Applications
- Fluid Dynamics and Heat Transfer
- Geological and Geophysical Studies
- Optical Imaging and Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Quantum many-body systems
- Magnetic confinement fusion research
- Optical Polarization and Ellipsometry
University of California, Los Angeles
2020-2024
Tsinghua University
2006-2020
Abstract Availability of relativistically intense, single-cycle, tunable infrared sources will open up new areas relativistic nonlinear optics plasmas, impulse IR spectroscopy and pump-probe experiments in the molecular fingerprint region. However, generation such pulses is still a challenge by current methods. Recently, it has been proposed that time dependent refractive index associated with laser-produced wakes suitably designed plasma density structure rapidly frequency down-converts...
We propose a novel positron beam loading regime in hollow plasma channel that can efficiently accelerate ${e}^{+}$ with high gradient and narrow energy spread. In this regime, the coincides drive ${e}^{\ensuremath{-}}$ time space their net current distribution determines wakefields. By precisely shaping profile phase according to explicit expressions, three-dimensional particle-in-cell (PIC) simulations show acceleration for of $\ensuremath{\sim}\mathrm{nC}$ charge $\ensuremath{\sim}\text{...
Plasma-based acceleration has emerged as a promising candidate an accelerator technology for future linear collider or next-generation light source. For collider, the energy transfer efficiency from drive beam to wake and trailing must be large, while emittance spread of bunch preserved. One way simultaneously achieve this when accelerating electrons is use longitudinally shaped bunches nonlinear wakes. In regime, there analytical formalism obtain optimal shapes. however, shape driver...
Plasma based acceleration (PBA) is being considered for a next generation linear collider (LC). In typical PBA-LC designs, the extreme beam parameters are expected to trigger background ion motion, which can lead longitudinally varying nonlinear focusing forces and result in emittance growth of beam. While various schemes have been proposed mitigate this at low energies, solution minimize later high energy stages multistage electron arm yet be found. paper, we propose use an adiabatic plasma...
Femtosecond electron bunches with complex temporal structures play a crucial role in terahertz generation, free-electron lasers, and plasma wakefield accelerators. However, diagnostics of beam current profiles femtosecond resolution are still challenging. Coherent transition radiation (CTR) has been proven to have the capability reconstruct based on prior knowledge or complete information spectra. In this paper, weighted greedy sparse phase retrieval (WGESPAR) algorithm is developed reduce...
Plasma-based acceleration (PBA) has emerged as a promising candidate for the accelerator technology used to build future linear collider and/or an advanced light source. In PBA, trailing or witness particle beam is accelerated in plasma wave wakefield (WF) created by laser driver. The WF often nonlinear and involves crossing of trajectories real space thus particle-in-cell methods are used. distance over which drive evolves several orders magnitude larger than wake wavelength. This large...
Plasma-based acceleration (PBA) is being considered for a next generation linear collider (LC). In some PBA-LC designs the electron arm, extreme beam parameters are expected to trigger background ion motion within witness beam, which can lead longitudinally varying nonlinear focusing forces and result in an unacceptable emittance growth of beam. To mitigate this, we propose use quasi-adiabatic plasma density ramps as matching sections at entrance exit each stage. We match low entrance, where...
The core to solve static correction in complex areas is build the high precision near-surface velocity model which accords with actual geological conditions. There are two aspects of deficiencies when convention tomographic inversion method used. On one hand, shallow information from not enough, on other it difficult determine bottom near-surface. Therefore, this paper presents a new based constraints water table marker bed, for thing, can use micro log, small refraction and surface accurate...
In the complex piedmont fold belts, it is always a challenge to ascertain crest, buried depth and boundary of structural trap. It shows that integrated seismic data processing interpretation method feasible address low SNR in Zagros belt. The preSTM can effectively improve imaging quality from piedmont; and, confirmed deep shallow structures are not consistent; pattern trap elements Bab reservoir reconfirmed meeting needs evaluation. Under theory fault related folding, several methods...
An important question when developing photon-counting detectors for computed tomography is how to select energy thresholds. In this work thresholds are optimized by maximizing signal-difference-to-noise ratio squared (SDNR2) in an optimally weighted image and signal-to-noise (SNR2) a gadolinium basis silicon-strip detector cadmium zinc telluride (CZT) detector, factoring pileup imperfect response both detectors. To investigate what extent one single set of could be applied various imaging...
Represented by discrete-time signals, continuous non-negative pulse trains have been successfully reconstructed from under-sampled measurements of their Fourier amplitude based on assumptions sparsity and finite support.
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. © 2019 The Author(s)
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text Z. Nie, C. Pai, J. Zhang, X. Ning, Hua, Y. He, Wu, Q. Su, S. Liu, Ma, Cheng, W. Lu, H. Chu, Wang, B. Mori, and Joshi, "Demonstration of Tunable Relativistic, Single-Cycle Infrared Pulses from a Tailored Plasma Structure," in Conference Lasers Electro-Optics, OSA Technical Digest (Optica Publishing Group, 2019), paper FF1C.5. Export BibTex Endnote (RIS) HTML Plain alert...