A5008487618- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Superconducting Materials and Applications
- Advanced Antenna and Metasurface Technologies
- Wireless Power Transfer Systems
- Photonic and Optical Devices
- Millimeter-Wave Propagation and Modeling
- Advanced Fluorescence Microscopy Techniques
- Thin-Film Transistor Technologies
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Energy Harvesting in Wireless Networks
- Full-Duplex Wireless Communications
- RFID technology advancements
- Superconducting and THz Device Technology
- Terahertz technology and applications
- Metamaterials and Metasurfaces Applications
- Antenna Design and Optimization
- Nuclear Physics and Applications
- Advanced MIMO Systems Optimization
- Radio Astronomy Observations and Technology
- Acoustic Wave Resonator Technologies
University of Electronic Science and Technology of China
2020-2024
Huzhou University
2022-2024
Oak Ridge National Laboratory
2006-2018
Argonne National Laboratory
2003
Abstract Nanomaterials have facilitated the development of innovative technologies in various industries. However, most research has been limited to nanoscale phenomena, and effects phenomena on microscale crystal growth remain obscure. In this study, we demonstrated a straight 2H-Si microneedle with longitudinal rate 6.7 × 10 4 Å·s -1 , which could not be explained by conventional mechanisms, through AlN nanowires. The nanowires were grown using hydride vapor-phase epitaxy method, induced...
Abstract Nanomaterials have facilitated the development of innovative technologies in various industries. However, most research has been limited to nanoscale phenomena, and effects phenomena on microscale crystal growth remain obscure. In this study, we demonstrated a straight 2H-Si microneedle with longitudinal rate 6.7 × 10 4 Å·s -1 , which could not be explained by conventional mechanisms, through AlN nanowires. The nanowires were grown using hydride vapor-phase epitaxy method, induced...
This letter presents a dual-frequency heterodyne retrodirective antenna (RDA) array with relatively large frequency ratio between receiving and transmitting for adaptive tracking in far-field wireless power transfer systems. The proposed RDA consists of an eight-channel radio mixing, amplify chain two 1 × 8 circularly polarized arrays different operation orthogonal polarizations, at 3.8 GHz right-hand circular polarization 5.8 left-hand polarization, respectively. For received levels from...
This communication proposes a reconfigurable reflectarray (RA) with decoupled right-/left-handed circularly polarized (RHCP/LHCP) 2-D beam steering. A simple-structured unit mechanical reconfigurability is designed to achieve the 1 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 1-bit dual-circularly (dual-CP) phase modulation, which enables scanning of dual-CP beams....
The APS storage ring beam chamber has been storing the up to 100 mA successfully. However, in some chambers, spurious signals corrupted BPM outputs. cause of unwanted was investigated, and it found that transverse electric (TE) longitudinal harmonic resonances were responsible. chambers have small height area between oval antechamber. structure behaves like a ridge waveguide so cut-off frequency mode becomes lower. pass-band then includes around 350 MHz is important position monitors (BPMs)....
The U.S. Spallation Neutron Source (SNS) now operates with 1.2 MW of beam power on target the near-term goal delivering 1.4 and a longer-term >2 required by planned Proton Power Upgrade (PPU) Second Target Station (STS) projects. In early 2018 we plan to replace entire 2.5 MeV injector configuration which includes ion source, Low Energy Beam Transport (LEBT) Radio Frequency Quadrupole accelerator (RFQ) one is currently being tested research called Test Facility (BTF) located at SNS facility....
This letter proposes a retrodirective array-feed reflector antenna for terahertz adaptive tracking communication systems. The gain reaches 35.3 dB at 216 GHz when the works in single-horn-feed mode with receiving, and side lobe level (SLL) is lower than −25 dB. And transmitting, it automatically forms reflected wave pointing to direction of incident wave. At vertical incidence, 41.2 dB, scanning coverage corresponding 3 drop ±22.5º. Measured results show that proposed well matched,...
The Spallation Neutron Source (SNS) linac will provide a 1 GeV proton beam for injection into the accumulator ring. In normal conducting (NC) section of this linac, Radio Frequency Quadupole (RFQ) and six drift tube (DTL) tanks are powered by seven 2.5 MW, 402.5 MHz klystrons four coupled cavity (CCL) cavities 5.0 805 klystrons. Eighty-one 550 kW, each drive single in superconducting (SC) linac. high power radio frequency (HPRF) equipment was specified procured LANL tested before delivery to...
This paper presents a high-isolation, low cross-polarization, differential-feed, dual-polarized microstrip patch antenna array. By using differential feeding and coupled structure, the array realizes high port isolation, which is suited for full duplex operating mode with two orthogonal linear polarizations of transmitting receiving, respectively. Simulations results show isolation greater than 40 dB at 2-5.2 GHz 60 2.42-2.47 GHz. The cross-polarization level less -40 on both E H planes....
This paper presents a terahertz high-gain dual-feed reflector antenna with agile beams. By using intermediate frequency beam forming technology, switching the corresponding microwave digital switch of 9 GHz to depend which horn is fed makes form two different Simulated gain reaches 49.9 dBi at 2.85° 3-dB beamwidth 0.38° and side lobe level 18.9 dB. The fabricated tested. Measured port reflection coefficient S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
An improved 1-4 power divider is presented in this paper, operating from 210 to 225GHz. The simulated results of the model software Ansoft HFSS show that it can achieve intended goal phase shift at required frequency with isolation more than 20 dB. constructed by three couplers rather traditional T-juncture improve between output ports. matching-loads ports are replaced E-plane square horn antennas. Meanwhile, lengths connecting waveguides be adjusted an arbitrary shift.
A novel stretchable and conformal 1 × 8 magnetic dipole array with wide-angle scan ability is presented. The antenna composed of the traditional dielectric substrate, copper-clad polyimide, flexible ecoflex, which while ensuring stable performance. Compact dipoles are used for element, conducive to stretching between curved surfaces. scanning realized by using wide-beam characteristics current parallel ground. proposed operates at 5.8 GHz in ISM band has a matching bandwidth 4.5% (5.65 -5.79...
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is a world‐class facility for materials research based on neutron scattering. It consists of negative hydrogen (H‐) ion source, linear accelerator, proton accumulator ring, and liquid Hg target. A power upgrade planned the device, which will require significant improvements in including production H‐beam currents 70–95 mA (∼2×the present SNS source value), with pulse length 1 ms duty factor ∼7%. No H‐sources currently...
The Advanced Photon Source (APS) storage ring (SR) RF system employs four banks of spherical, single-cell resonant cavities. Each cavity is tuned by varying the volume through insertion/retraction a copper piston located at circumference and oriented perpendicular to accelerator beam. During commissioning APS SR, tuners tuner ports were prone extensive arcing overheating. existing modified eliminate problems, two new, redesigned installed. In both cases marked improvements obtained in...