A5021476071- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Photocathodes and Microchannel Plates
- Electromagnetic wave absorption materials
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Nuclear Physics and Applications
- solar cell performance optimization
- Semiconductor Quantum Structures and Devices
- Advancements in Battery Materials
- Microwave Engineering and Waveguides
- Magnetic Properties and Synthesis of Ferrites
- Aluminum Alloys Composites Properties
- Flow Measurement and Analysis
- Electromagnetic Compatibility and Measurements
- Advanced Adaptive Filtering Techniques
- Radio Wave Propagation Studies
- Physics of Superconductivity and Magnetism
- Advanced Data Storage Technologies
- Blind Source Separation Techniques
- Carbon Nanotubes in Composites
- Geophysical Methods and Applications
Chinese Academy of Sciences
2013-2024
University of Chinese Academy of Sciences
2008-2024
Institute of High Energy Physics
2012-2024
University of Cambridge
2024
Lawrence Berkeley National Laboratory
2008-2016
Stanford Synchrotron Radiation Lightsource
1971
Stanford University
1971
SLAC National Accelerator Laboratory
1971
A combined precipitation-hydrothermal method was used to fabricate carbon nanotube/Ni0.5Zn0.5Fe2O4 ferrite composite powders. The phase, microstructure and electromagnetic properties of CNT/Ni0.5Zn0.5Fe2O4 composites were investigated. After surface modification, zeta potential value CNTs could maintain at about −50 mV when pH is higher than 8, which affords a suitable environment for in situ coating Ni0.5Zn0.5Fe2O4 nanocrystallines. With increasing content, the saturation magnetization...
A low-frequency superconducting cavity is needed in main accelerators for storage ring light sources with ultralow emittance. compact 166.6 MHz proof-of-principle was designed adopting a quarter-wave β = 1 geometry High Energy Photon Source (HEPS). It 6 GeV diffraction-limited synchrotron source currently being developed at the Institute of Physics. The exceedingly size yet possessing low resonant frequency. nearest higher order mode largely separated from fundamental, making an attractive...
Interferometric experiments designed to detect the highly redshifted 21-cm signal from neutral hydrogen are producing increasingly stringent constraints on power spectrum, but some k-modes remain systematics-dominated. Mutual coupling is a major systematic that must be overcome in order signal, and simulations reproduce effects seen data can guide strategies for mitigating mutual coupling. In this paper, we analyse 12 nights of Hydrogen Epoch Reionization Array compare against include...
The 21 cm transition from neutral Hydrogen promises to be the best observational probe of Epoch Reionisation (EoR). This has led construction low-frequency radio interferometric arrays, such as Reionization Array (HERA), aimed at systematically mapping this emission for first time. Precision calibration, however, is a requirement in observations. Due spatial compactness HERA, array prone effects mutual coupling, which inevitably lead non-smooth calibration errors that contaminate data. When...
The world’s first 1.3 GHz cryomodule containing eight 9-cell superconducting radio-frequency (rf) cavities treated by medium-temperature furnace baking (mid-T bake) was developed at the Institute of High Energy Physics, Chinese Academy Sciences. in achieved an unprecedented high average intrinsic quality factor (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mi>Q</a:mi><a:mn>0</a:mn></a:msub></a:mrow></a:math>) <c:math...
Superconducting 166.6 MHz β = 1 cavities of quarter-wave geometry have been chosen for a high energy photon source, 6 GeV diffraction-limited synchrotron light source currently under construction in Beijing. Five will provide the required 5.4 MV radio frequency (rf) voltage and 900 kW beam power. Each cavity be equipped with one fundamental power coupler (FPC), delivering minimum rf 180 to beam. A 50 Ω coaxial structure planar warm window was employed. Its location carefully selected avoid...
A high repetition rate, MHz-class, high-brightness electron source is a key element in future high-repetition-rate x-ray free laser-based light sources. The VHF-gun, novel low frequency radio-frequency gun, the Lawrence Berkeley National Laboratory (LBNL) response to that need. gun design based on normal conducting, single cell cavity resonating at 186 MHz VHF band and capable of continuous wave operation while still delivering accelerating fields cathode required for brightness performance....
A superconducting 166.6 MHz quarter-wave beta=1 cavity was recently proposed for the High Energy Photon Source (HEPS), a 6 GeV kilometer-scale light source. Four cavities will be used main acceleration in newly planned on-axis beam injection scheme realized by double-frequency RF system. The fundamental frequency, MHz, dictated fast kicker technology and preference of using 499.8 SC as third harmonic. Each operated at 4.2 K providing 1.2 MV accelerating voltage 150 kW power to electron beam....
Superconducting β=1 quarter-wave geometry of 166.6 MHz has been proposed as main accelerating cavities for the high-energy photon source (HEPS) storage ring. HEPS is a 6-GeV kilometer-scale synchrotron light promising ultralow emittance currently being constructed in Beijing. A proof-of-principle cavity previously in-house developed and vertical-tested achieving excellent cryogenic performances. helium jacket was subsequently designed adopting simple structure an integrated magnetic field...
Superconducting 499.8-MHz radio frequency (rf) cavities have been proposed for the High Energy Photon Source (HEPS), a 6-GeV diffraction-limited synchrotron light source currently under construction in Beijing. Being an active third-harmonic system, two shall provide 3.5-MV rf voltage and 400 kW of beam power to enable complex gymnastics required by novel injection scheme. Adopting veteran KEKB-type 500-MHz single-cell geometry, cavity design has focused on optimizing its mechanical...
166.6-MHz superconducting cavities have been chosen for the High Energy Photon Source (HEPS) as main accelerating structures to provide 900 kW of beam power and 5.4 MV voltage. A proof-of-principle cavity adopting quarter-wave beta = 1 geometry was previously developed. Excellent performance achieved in vertical tests at cryogenic temperatures. The later welded with a helium jacket, dressed coupler other ancillaries, high-power tested test cryomodule. Performance degradation observed...
In this letter, we propose a novel speech enhancement approach, called power spectral density minimum mean-square error (PSD-MMSE) estimation-based enhancement, which is implemented in the domain where stationary stochastic noise can be modeled as exponential distribution. Speech magnitude-squared spectra are mixed And an MMSE estimator constructed based on parametric distributions. Besides, fast algorithm presented to implement approach real time. Experimental results of Itakura-Saito...
Consolidation of two large accelerator control rooms using digital computers connected by a data link is described. Several consolidation plans are discussed and the adopted solution The key elements touch panels operating with TV display system.
An RF power coupler is a key component of the superconducting accelerating system in Chinese ADS proton linac injector I, which used to transmit 15 kW from source HWR cavity. According requirement working frequency, level, transmission capability and cooling condition, physics design has been finished, includes structure optimization, thermal simulation, stress analysis so on. Based on this design, prototype fabricated, it successfully passed high test.