A5067534828- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Radio Frequency Integrated Circuit Design
- Muon and positron interactions and applications
- Magnetic confinement fusion research
- Electromagnetic Compatibility and Measurements
- Ionosphere and magnetosphere dynamics
- Power Transformer Diagnostics and Insulation
- Energy Harvesting in Wireless Networks
- Spacecraft and Cryogenic Technologies
- High voltage insulation and dielectric phenomena
- Diamond and Carbon-based Materials Research
- Vacuum and Plasma Arcs
- Gas Dynamics and Kinetic Theory
- Radioactive element chemistry and processing
- Plasma Applications and Diagnostics
- Particle Detector Development and Performance
- Neutrino Physics Research
- Advanced Photocatalysis Techniques
- Ion-surface interactions and analysis
- Metal-Organic Frameworks: Synthesis and Applications
- Thermal Analysis in Power Transmission
China Academy of Engineering Physics
2021-2025
Iowa State University
2023
Nanjing University of Aeronautics and Astronautics
2021-2023
Peking University
2016-2020
State Key Laboratory of Nuclear Physics and Technology
2016
High-energy radiation that is compatible with renewable energy sources enables direct H2 production from water for fuels; however, the challenge to convert it as efficiently possible, and existing strategies have limited success. Herein, we report use of Zr/Hf-based nanoscale UiO-66 metal-organic frameworks highly effective stable sensitizers purified natural splitting under γ-ray irradiation. Scavenging pulse radiolysis experiments Monte Carlo simulations show combination 3D arrays...
A deuteron radio-frequency quadrupole (RFQ) is being built by the RFQ group at Peking University. It a very compact high-current RFQ, operating 162.5 MHz in continuous-wave mode. By optimizing beam dynamics design, our simulations reached 98% transmission efficiency for acceleration of 50-mA from 50 keV to 1 MeV, with an intervane voltage 60 kV and length 1.809 m. This adopts window-type structure, low power consumption sufficient mode separation, no stabilizing rods required. Its magnetic...
The present study proposes a new approach for direct CO2 conversion using primary radicals from water irradiation. In order to ensure reduction of into CO2-. by all the radiation-induced radicals, we use formate ions scavenge simultaneously parent oxidizing H. and OH. producing same transient radicals. Conditions are optimized obtain highest yield . goal is achieved under mild conditions room temperature, neutral pH 1 atm pressure. All available exploited selectively converting oxalate that...
The radio-frequency quadrupole (RFQ) group at Peking University has built a window-type RFQ, operating 162.5 MHz in continuous-wave (cw) mode. It is designed to accelerate 50 mA deuteron beam from keV 1 MeV with vane length of 1.809 m. cavity was fabricated two segments using 100% oxygen-free electronic (OFE) copper. Using an iterative assembly and measurement procedure for the precise alignment segments, we reduced errors within $\ifmmode\pm\else\textpm\fi{}0.05\text{ }\text{ }\mathrm{mm}$....
In order to reduce the beam impedance and refrigeration power dramatically, we have designed a high temperature superconductor (HTS) coated screen cold chamber walls of super proton-proton collider bending magnets from beam-induced heat loads. It employs an absorber, inspired by future circular studies, absorb immense synchrotron radiation 12.8 W/m emitted 37.5 TeV proton beams. Such structure has advantage decreasing electron cloud effect improving vacuum. We compared critical magnetic...
Abstract The Nuclear Science and Instrumentation Laboratory (NSIL) is currently establishing a Neutron Facility (NSF) based on two compact neutron generators: Deuterium-Deuterium (DD), resulting in 2.45 MeV neutrons, Deuterium-Tritium (DT), 14.1 with maximum source intensities up to 5 × 10 6 n/s 4 8 over 4π, respectively. Neutron/X-ray radiography tomography are of the applications NSF will be equipped with. In this paper, we report state system, neutron/X-ray experiments performed. Good...
As a new device, plasma window has been designed to use discharge separate atmosphere from vacuum with high difference of pressure. It many excellent properties, being able be used as available passage for ion beam negligible energy loss, also impervious radiation damage and thermal damage. Normally focusing by accelerators is not that easy achieve within channel small cross section. 10 mm diameter window's experimental realization could contribute its further application in accelerator...
Abstract The spatial distributions of different kinds ions are usually not completely the same in process extracting. In order to study reason for characteristics ion extraction, a simplified simulation model Cu + and Cr extraction was established by 2D3V (two-dimensional space three-dimensional velocity space) particle-in-cell (PIC) method. effects voltages from 0 V 500 on density distribution change plasma emission surface were analyzed. On basis this model, mixed with Li , Mg K Fe Y Ag Xe...
The characteristics of the extracted ion current have a significant impact on design and testing source performance. In this paper, 2D in space 3D velocity particle cell (2D3V PIC) method is utilized to simulate plasma motion extraction under various initial distributions voltages Cartesian coordinate system. density order 10 15 m −3 –10 16 voltage 100 V–1000 V. study investigates electrons positive ions, analyzes influence different current. simulation results reveal that main reason for...
Abstract Lunar water ice is an important resource to support the construction of lunar base and other deep space activities, it crucial detect ice. In this paper, we studied detection based on a small neutron generator through Monte-Carlo simulation. The schematic system principle are explained. simulation results demonstrate that change thermal flux with increase content most obvious clear. There positive correlation between counting in soil. Using counting, can be obtained by inversion.
The microparticle-initiated breakdown plays a key role in the failure of gas switches and has become an active area investigation discharge recently. mechanism 2-mm air gap is studied by experiments simulations this article. dynamics microparticle electric field obtained, four modes are acquired from picture high-speed camera. probabilities for 200-, 300-, 500-μm Cu microparticles under different voltages presented, corresponding lowest reduce to 65%, 56%, 47% static-breakdown voltage....
Alumina ceramics are commonly used as high-voltage insulation materials. The alumina ceramic will turn yellow after being irradiated with a certain amount of X-rays. Based on this phenomenon, we focused the study yellowing mechanism and effect X-ray irradiation electrical properties ceramics. results indicate that X-rays irradiating ceramic, color becomes due to generation centers; within an dose 3 mGy, have no adverse ceramic.