A5050707594- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Superconducting Materials and Applications
- Advanced Fiber Laser Technologies
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Magnetic confinement fusion research
- Semiconductor Lasers and Optical Devices
- Muon and positron interactions and applications
- Electron and X-Ray Spectroscopy Techniques
- Gene expression and cancer classification
- Optical Coherence Tomography Applications
- Geophysics and Sensor Technology
- Advanced Electron Microscopy Techniques and Applications
- Optical measurement and interference techniques
- Structural Health Monitoring Techniques
- Physics of Superconductivity and Magnetism
- Cancer Genomics and Diagnostics
- Radiation Therapy and Dosimetry
- Magnetic Properties and Applications
- Plasma Diagnostics and Applications
China GreatWall Technology Group (China)
2022
Huazhong University of Science and Technology
2014-2020
Wuhan Ship Development & Design Institute
2019
Institute of High Energy Physics
1993-2014
Chinese Academy of Sciences
2005-2014
National Natural Science Foundation of China
2014
European Organization for Nuclear Research
1985-2002
An accelerator-driven subcritical system (ADS) program was launched in China 2011, which aims to design and build an ADS demonstration facility with the capability of more than 1000 MW thermal power multiple phases lasting about 20 years. The driver linac is defined be 1.5 GeV energy, 10 mA current cw operation mode. To meet extremely high reliability availability, designed much installed margin fault tolerance, including hot-spare injectors local compensation method for key element...
Accurate shoreline extraction is critical for coastal engineering applications, including erosion monitoring, disaster response, and sustainable management of island ecosystems. However, traditional methods face challenges in large-scale monitoring due to high costs, environmental interference (e.g., cloud cover), poor performance complex terrains bedrock coastlines). This study developed an optimized DeepLabV3+ model the shorelines, which improved by replacing backbone network with...
A multi-parameter optical-fiber sensor, which is based on multiple acoustic modes in stimulated Brillouin scattering (SBS) effect, for distributed measurement of temperature and strain utilizing standard single-mode fiber (SSMF) proposed experimentally demonstrated. By manipulating doping level refractive index profile the fiber, properties gain spectrum (BGS) related to guided optical are analyzed. The simulated results indicate that can be excited (SMF) BGS composed peaks corresponding...
A polarization-independent narrow passband optical filter with a FWHM bandwidth of ~10 MHz based on stimulated Brillouin scattering (SBS) effect is proposed and experimentally demonstrated. By optimizing the parameters depolarizer consisting power-splitting Mach-Zehnder interferometer (MZI) structure, degree polarization (DOP) pump source can be reduced to less than 5%. Consequently frequency response SBS-based remains almost unchanged when state (SOP) input signal varies corresponding...
Brillouin optical spectrum analyzer (BOSA) based on stimulated scattering (SBS) can provide ultra-high resolution, which in theory greatly improve the signal-to-noise ratio (OSNR) measurement accuracy, especially for systems with close channel spacing and cascaded filtering effect (CFE). BOSA utilizes narrow bandwidth SBS as an active band-pass filter (A-OBPF); thus, unwanted out-of-band spectral components are actually not completely suppressed may account unneglectable proportion of power...
To enhance the signal intensity of magnetostrictive position sensor (MPS), a new method bipolar pulse excitation (BPE), and structure single-end damper (SED) are proposed in this paper. Two torsion strain waves, named as W1 W2 generated by BPE, wave is reflected (changed into RW1) SED. Based on principle superposition, interference between RW1 realized adjusting parameters sensor. Therefore, MPS strengthened 1.8 times approximately well measuring range. The notable difference strategy...
We propose a curve reconstruction model based on material frame and twisted multicore fiber (MCF), which can reconstruct the position orientation of MCF simultaneously. The is approximated as ribbon, whose centerline surface characteristics are used to characterize MCF. Material corresponding ribbon established, quantitative analysis realized by differential equations between basis vectors deformation parameters. Bending, twisting-strain established according approximate development MCF,...
The period length is usually much larger than the cavity effective in a low energy superconducting linac. long drifts between cavities will not only decrease acceptance of linac, but also lead to possible instability. linac be more sensitive mismatch and other perturbations. From longitudinal motion equation, function which describes parametric resonance deduced relation instability region filling factor discussed. It indicates that if zero current phase advance per kept below 90°, driven by...
The electron cloud instability (ECI) in the Beijing Electron Positron Collider (BEPC) was studied systematically with experiments and simulations recent years. Several detectors have been installed into BEPC storage ring to measure yield. effects of solenoid, clearing electrode, chromaticity, octupole on ECI investigated experimentally. To evaluate BEPCII, upgrade project BEPC, a computer code has developed simulate density antechamber under different conditions, as well progress single...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation X. Altuna, C. Arimatea, R. Bailey, T. Bohl, D. Brandt, K. Cornelis, Depas, F. Galluccio, J. Gareyte, Giachino, M. Giovannozzi, Z. Guo, W. Herr, A. Hilaire, Lundberg, Miles, L. Normann, Risselada, Scandale, Schmidt, Spinks, Venturini, Schmidt; The 1991 dynamic aperture experiment at the CERN SPS. AIP Conf. Proc....
3D shape sensing utilizing stimulated Brillouin scattering in multi-core fiber is experimentally demonstrated. A 1.7-m helical curve can be reconstructed with a RMSE of 0.0200 m when the spatial resolution 20 cm.
A GI-FMF for multi-parameter sensing is proposed, utilizing interaction between multiple acoustic modes in SBS process. Consequently simultaneous temperature and strain measurement may be achieved with a sensitivity of five times larger than conventional methods.
A novel highly nonlinear optical fiber with enhanced stimulated Brillouin scattering for narrow-band filtering is proposed. Herein, we initially discuss the tailoring of gain spectrum in germanium and fluorine co-doped single cladding fibers. By adjusting structure doping concentration, excitation acoustic modes, as well coupling efficiency between them, can be manipulated properly. Then a double introduced order to mitigate accompanying undesired four-wave mixing effect. The simulation...
A dual-parameter measurement method is proposed, utilizing the multi-peak BGS contributed by multiple acoustic modes in stimulated Brillouin scattering process. fivefold enhancement sensitivity may be achieved for temperature and strain.
In the Large Hadron Collider (LHC) particle stability over about 10 min is required at injection: this corresponds to 7*10/sup 6/ turns in machine. Tracking simulations up such a high number of for significant different cases impractical, if not impossible, even with most powerful computer. Therefore, approach must be used evaluate LHC long-term dynamic aperture. The realistic machine has been modeled, including RF cavities, residual closed-orbit distortion after compensation, systematic and...
A vertical coupled bunch instability explained as the photoelectron (PEI) was observed in photon factory at KEK. To further investigate instability, experiments on PEI have been carried out Beijing Electron Positron Collider (BEPC) with collaboration between MEP, China and KEK, Japan. Many interesting phenomena for different sets of parameters.
Electron cloud interactions with high-energy beams are believed,. responsible, for various undesirable effects ranging from vacuum degradation to collective beam instabilities. An important source of uncertainty in predicting electron a given machine lies understanding detail the processes relating generation cloud. The Advanced Photon Source (APS) has taken lead role development techniques and interpretation direct measurements distribution. Through such data, good progress been made...
The bunch lengthening in the Beijing Electron-Positron Collider (BEPC) is investigated systematically with streak camera and method of beam spectrum analysis. Many available results are obtained from measurement corresponding scaling law summarized light existing theoretical explanation. Due to its importance for BEPC upgrades, related parameters effects studied details.
Many experiments on photoelectron instability (PEI) have been carried out at the Beijing Electron Positron Collider (BEPC) in IHEP, China, collaboration with KEK. Simulations PEI a physical model give qualitative agreements observations both BEPC and KEK-B. Based detectors Advanced Photon Source (APS), ANL, specially-constructed detector was installed BEPC. It is hoped to obtain realistic values for (PE) secondary electron yields as well energy spectrum of cloud through direct measurements...
An experiment investigating the photoelectron instability has been performed in BEPC at IHEP, China. The betatron oscillation of each bunch was observed and recorded by a single pass beam position monitor system which capability to measure transverse every over 16000 turns. effect an octupole magnet on also studied. This paper describes results those observations analyses.