A5100404684- Laser-Plasma Interactions and Diagnostics
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Laser-induced spectroscopy and plasma
- Particle Accelerators and Free-Electron Lasers
- Laser-Matter Interactions and Applications
- Astrophysical Phenomena and Observations
- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- High-pressure geophysics and materials
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- Cold Atom Physics and Bose-Einstein Condensates
- CCD and CMOS Imaging Sensors
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Muon and positron interactions and applications
- Galaxies: Formation, Evolution, Phenomena
- Particle accelerators and beam dynamics
- Advanced Fiber Laser Technologies
- Quantum Electrodynamics and Casimir Effect
- Advanced Frequency and Time Standards
Chinese Academy of Sciences
2015-2025
University of Chinese Academy of Sciences
2015-2025
Institute of High Energy Physics
2022-2024
Wuhan Institute of Physics and Mathematics
2015
Nankai University
2014-2015
Institute of Theoretical Physics
2014
Abstract In laser-driven plasma wakefield acceleration, laser pump depletion and electron dephasing are the major constraints of energy gain. Hybrid laser-plasma which uses laser-accelerated beam to drive a beam-driven in separated stages, has been proposed increase brightness. However, overall gain hybrid acceleration is even lower than single-stage acceleration. this paper, we report observation boosting effect single uniform plasmas through series particle-in-cell simulations. The...
In recent years, the field of positron acceleration in plasma wakefield accelerators has witnessed rapid theoretical advancements, and several effective schemes have been proposed. these studies, longitudinally uniform is taken into account, with beam located at start second bubble. The electron filament near provides Coulomb attraction force for guiding beam. However, influence vacuum-plasma transition on beams not considered yet, where bubble larger than that density plateau region,...
We theoretically analyze the effects of two primary mechanisms residual amplitude modulation, estimate resulting frequency instabilities, and discuss relevant experimental countermeasures, providing useful information that are beneficial for development ultrastable optical oscillators as well many precision experiments relying on stable lasers. A Pound-Drever-Hall signal comprising contributions from birefringence electro-optic crystal is derived used to examine birefringence-related...
We study the entropy relations of multi-horizons black holes in higher dimensional (A)dS spacetime with maximal symmetries, including Einstein-Maxwell gravity and $f(R)$(-Maxwell) gravity. These additional equalities thermodynamics are expected to be useful understanding origin hole at microscopic level. Revisiting product introduced by Cvetic etc, our case, it has an unexpected behavior. It is shown that this electric charge $Q$ plays important role product. The charged only depends on mass...
We present a new "universal property" of entropy, that is the "entropy sum" relation black holes in four dimensional (anti-)de-Sitter asymptotical background. They depend only on cosmological constant with necessary effect un-physical "virtual" horizon included spacetime where constant, mass hole, rotation parameter and Maxwell field exist. When there more extra matter spacetime, one will find also dependent strength these field. For both cases, we conclude does not conserved charges M , Q J...
We revisit the entropy product, sum and other thermodynamic relations of charged rotating black holes. Based on these relations, we derive (area) bound for both event horizon Cauchy horizon. establish results variant class 4-dimensional holes in Einstein(–Maxwell) gravity higher derivative gravity. also generalize discussion to with NUT charge. The validity this formula, which seems be universal two horizons, gives further clue crucial role that multi-horizons play hole thermodynamics...
We focus on the entropy relations of black holes in three, four and higher dimensions. These include product, "part" product sum. also discuss their differences similarities, order to make a further study understanding origin hole at microscopic level.
We propose to use tightly focused lasers generate high quality electron beams in laser wakefield accelerators. In this scheme, the expansion of beam after focal position enlarges size bubble, which reduces effective phase velocity wake and triggers injection plasma electrons. This scheme injects a relatively long with charge. The energy spread injected can be minimized if an optimal acceleration distance is chosen so that chirp suppressed. Particle-in-cell simulations indicate charge on...
We propose to use a frequency doubled pulse colliding with the driving at an acute angle trigger ionization injection in laser wakefield accelerator. This scheme effectively reduces duration that occurs, thus high quality is obtained. Three-dimensional particle-in-cell simulations show electron beams energy of ~500 MeV, charge ~40 pC, spread ~1% and normalized emittance few millimeter milliradian can be produced by ~100 TW pulses. By adjusting between two pulses, intensity gas dope ratio,...
We propose a new injection scheme that can generate electron beams with simultaneously few permille energy spread, submillimeter milliradian emittance, and more than 100 pC charge in laser wakefield accelerators. In this scheme, relatively loosely focused pulse drives the plasma wakefield, tightly similar intensity triggers an interference ring pattern creates onion-like multisheaths wakefield. Owing to change wavefront curvature after focal position of laser, innermost sheath expands, which...
Abstract Laser plasma accelerators (LPAs) have become one of the frontiers accelerator community, mainly because they promise orders magnitude improvement in accelerating gradient. However, energy stability and spread high-charge bunched beams (e.g. several hundred pC per bunch) from LPAs still strongly limit their application. In this work, we propose a novel method utilizing magnetic chicanes combined with both active passive dechirpers to simultaneously reduce central deviation LPAs....
The proposed Circular Electron Positron Collider (CEPC) imposes new challenges for the vertex detector in terms of pixel size and material budget. A Monolithic Active Pixel Sensor (MAPS) prototype called TaichuPix, based on a column drain readout architecture, has been developed to address need high spatial resolution. In order evaluate performance TaichuPix-3 chips, beam test was carried out at DESY II TB21 December 2022. Meanwhile, Data Acquisition (DAQ) muti-plane configuration tested...
We propose to use tightly focused lasers generate high quality electron beams in laser wakefield accelerators. In this scheme, the expansion of beam after focal position enlarges size bubble, which reduces effective phase velocity wake and triggers injection plasma electrons. This scheme injects a relatively long with charge. The energy spread injected can be minimized if an optimal acceleration distance is chosen so that chirp suppressed. Particle-in-cell simulations indicate charge order...
Due to the highly nonlinear nature of beam-loading, it is at present not possible analytically determine beam parameters needed in a two-bunch plasma wakefield accelerator for maintaining low energy spread. Therefore this paper, by using Broyden-Fletcher-Goldfarb-Shanno algorithm parameter scanning with code QuickPIC and polynomial regression together k-fold cross-validation method, we obtain two fitting formulas calculating tri-Gaussian electron beams when minimizing spread based on...