A5009076483- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Photocathodes and Microchannel Plates
- Photonic and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Laser Design and Applications
- Topological Materials and Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Plasmonic and Surface Plasmon Research
- Optical properties and cooling technologies in crystalline materials
- Particle physics theoretical and experimental studies
- Research Data Management Practices
- Quantum Information and Cryptography
- Metamaterials and Metasurfaces Applications
- Laser-Matter Interactions and Applications
- Hearing Loss and Rehabilitation
- Magnetic Properties of Alloys
- Mechanical and Optical Resonators
- solar cell performance optimization
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
North China Electric Power University
2024
Stony Brook University
2020-2023
Brookhaven National Laboratory
2012-2022
Indiana University Bloomington
2009
This document presents BNL's plan for an electron-ion collider, eRHIC, a major new research tool that builds on the existing RHIC facility to advance long-term vision Nuclear Physics discover and understand emergent phenomena of Quantum Chromodynamics (QCD), fundamental theory strong interaction binds atomic nucleus. We describe scientific requirements such facility, following up community-wide 2012 white paper, 'Electron-Ion Collider: Next QCD Frontier', present design concept incorporates...
Continuous-wave photoinjectors operating at high accelerating gradients promise to revolutionize many areas of science and applications. They can establish the basis for a new generation monochromatic x-ray free electron lasers, high-brightness hadron beams, or microchip production. In this Letter we report on record-performing superconducting rf gun with ${\mathrm{CsK}}_{2}\mathrm{Sb}$ photocathode. The is generating charge bunches (up $10\text{ }\text{ }\mathrm{nC}/\text{bunch}$) low...
Abstract High brightness, high charge electron beams are critical for a number of advanced accelerator applications. The initial emittance the beam, which is determined by mean transverse energy (MTE) and laser spot size, one most important parameters determining beam quality. bialkali photocathodes illuminated visible have advantages quantum efficiency (QE) low MTE. Furthermore, Superconducting Radio Frequency (SRF) guns can operate in continuous wave (CW) mode at accelerating gradients,...
Traditional microperforated panels (MPPs) and metamaterial-based sound absorbers rely on local resonances or multi-resonator designs, which limit their bandwidth, angular applicability, ease of fabrication. Leveraging the reciprocity theorem cavity resonances, we introduce a new class robust MPP absorbers, termed meta-MPPs, capable achieving ultrabroadband near-total absorption across range 0.37 to 10 kHz. These demonstrate average performance exceeding that traditional MPPs by over 100%,...
Structurally modulated intrinsic chirality is a structural transformation phenomenon in photoresponsive molecules that commonly utilized biosensing and chemical analysis. In this study, we proposed an approach to achieve giant quasi-bound state the continuum (Q-BICs)-slanted tetramer metasurface, where high Q factors circular dichroism (CD) coexist. Empowered by simultaneous resonance between toroidal dipole (TD) electric quadrupole (EQ) modes, can be effectively tuned via variations slant...
Cooling of beams gold ions using electron bunches accelerated with radio-frequency systems was recently experimentally demonstrated in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Such an approach is new and opens possibility this technique higher energies than possible electrostatic acceleration beams. The challenges include generation suitable for cooling, delivery required quality to cooling sections without degradation beam angular divergence energy spread,...
Due to their ultrahigh Q-factor and small mode volume, bound states in the continuum (BICs) are intriguing for fundamental study of strong coupling regime. However, generated by BICs one metasurface is not always enough, which highly limits its efficiency applications. In this work, we realize a giant at most 60 meV quasi-BICs' (Q-BICs) tetramer composed four Si cylinders with two different sets diagonal lengths. The Q-BICs induced from types electric quadrupole (EQ), detuning can be...
A high-current high-brightness electron accelerator for low-energy RHIC cooling (LEReC) was successfully commissioned at Brookhaven National Laboratory. The LEReC includes a dc photoemission gun, laser system, photocathode delivery magnets, beam diagnostics, superconducting rf booster cavity, and set of normal conducting cavities to provide enough flexibility tune the in longitudinal phase space. Cooling with nonmagnetized accelerated beams requires corrections obtain small momentum spread...
In this paper we describe an instability, which called a Plasma-Cascade Amplifier, occurring in electron beams propagating along straight trajectory.
The recent achievements in the performance of superconducting RF (SRF) photoinjectors have opened a new era development reliable high-brightness CW electron sources. While SRF guns become one most promising technologies, compatibility environment with complex photocathodes remains on forefront modern accelerator science. cavities operate at cryogenic temperatures providing ultra-high vacuum (UHV) highly beneficial for photocathode performance. However, necessity to keep room temperature...
In the aspect of longitudinal beam bunching, bunching strength can be controlled by RF cavity phase and voltage. However, these machine parameters are different from those that interact with itself. order to gain control beam-cavity interaction, calibration must performed. Furthermore, it relies on fitting energy versus a function. Under conventional assumption relativistic conditions, function is first harmonic sinusoidal (a period 2π). this expression insufficient for high-voltage cavity....
In the aspect of longitudinal beam bunching, bunching strength can be controlled by rf cavity phase and voltage. However, these machine parameters are different from those that interact with itself. order to gain control beam-cavity interaction, calibration must performed. Furthermore, it relies on fitting energy versus a function. Under conventional assumption relativistic conditions, function is first harmonic sinusoidal (a period $2\ensuremath{\pi}$). this expression insufficient for...
A diffractive structure of cavities is designed to produce resonances at very high frequencies. This type cavity may be useful for producing controllable coherent synchrotron radiation by microbunching the particle beam.