A5103276874- Photocathodes and Microchannel Plates
- Dark Matter and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Ga2O3 and related materials
- Astrophysics and Cosmic Phenomena
- GaN-based semiconductor devices and materials
- Gyrotron and Vacuum Electronics Research
- Atomic and Subatomic Physics Research
- Electron and X-Ray Spectroscopy Techniques
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Analytical Chemistry and Sensors
- Superconducting and THz Device Technology
- Superconducting Materials and Applications
- solar cell performance optimization
- Advanced Chemical Physics Studies
- Optical Systems and Laser Technology
- Parallel Computing and Optimization Techniques
- Quantum and electron transport phenomena
- Advanced MEMS and NEMS Technologies
- Magnetic confinement fusion research
Vision Technology (United States)
2024
Institute of High Energy Physics
2019-2021
University of Chinese Academy of Sciences
2021
Harbin Institute of Technology
2019
Chinese Academy of Sciences
2019
Nanjing University of Science and Technology
2012-2016
To research the photoemission performance of a transmission-mode Al(1-x)Ga(x)N photocathode, Al0.24Ga0.76N and GaN photocathodes with same structure were activated, their spectral responses measured using multi-information measurement system at room temperature, photocathode parameters obtained by fitting quantum efficiency curves. The results showed that both reflective-mode AlGaN lower than those photocathode. Compared short-wavelength response was less seriously affected lattice defects...
Abstract The improvement of time resolution in time-of-flight positron emission tomography (TOF-PET) relies on the development scintillation materials and photodetectors. With introduction Cherenkov TOF-PET, higher requirements have been placed intrinsic timing performance Our team has proposed a Radiator Window Photomultiplier tube (CRW-FPMT) that uses radiator directly as light window, which eliminates boundary between scintillator photodetector for fast resolution. This paper mainly...
Abstract Cooperating with the North Night Vision Science & Technology (Nanjing) Research Institute Co. Ltd, of High Energy Physics in China is developing a 2-inch square shape 8 × anodes micro-channel-plate photomultiplier tube (MCP-PMT) time resolution picosecond level. It has 40 mm 2 bi-alkali photocathode peak quantum efficiency (QE) about 22% around wavelength 410 nm. With chevron MCP stack, MCP-PMT can reach gain over 10 6 under working voltage 1500 V. The typical output waveform an...
In order to understand the photoemission mechanism of reflection-mode InGaAs photocathode with a thin emission layer, formula describing quantum efficiency is revised by solving one-dimensional continuity equation, in which electrons generated GaAs buffer layer are considered. Compared conventional formula, proved be more suitable for layer. experiment, sample goes through two-step surface preparation including wet chemical cleaning process and heat treatment process. Then activated Cs/O...
The stability of negative electron affinity Ga0.37Al0.63As photocathodes in an ultrahigh vacuum system has been investigated. degraded photocurrents the Cs/O activated under illumination with different intensity are recorded real time, and quantum efficiencies measured after degradation. photocathode no at regular intervals. Multiple activations performed on photocathode, that measured. results indicate lifetime increases as decreases, is longer than GaAs case illumination. Besides, second...
Three InGaAs photocathode samples with different emission layers were prepared using metal organic chemical vapor deposition and activated by Cs, O. The spectral responsivity curves of the three obtained, quantum efficiency formula photocathodes multi-sublayers was derived. Results show that thick have higher responsivity, wavelength threshold decreases decrease In component. According to performance parameters obtained fitting experiment, it found a component corresponds lower electron...
The effect of Cs adsorption on the photoemission performance a reflection-mode GaAlAs photocathode in an ultrahigh vacuum chamber has been investigated. experiments for Cs/O activation, multiple recaesiation, and degradation are performed photocathode. Meanwhile, activated recaesiated photocurrent curves, degraded spectral response curves measured analyzed. Besides, parameters photocathodes obtained by using formula to fit with experimental quantum efficiency curves. results show that atoms...
The Jiangmen Underground Neutrino Observatory (JUNO) in China aiming to determine the neutrino mass hierarchy is under construction and 15,000 MCP-PMTs produced NNVT, which will be installed as central liquid scintillator detector of JUNO, have been completed delivered by August 2020. During production process, breakthrough photocathode technology greatly improved quantum efficiency (QE) MCP-PMT from 30% 35% so detection (DE) has improved. performance other parameters keeps steady during...
Abstract The Jiangmen Underground Neutrino Observatory (JUNO) in China aiming to determine the neutrino mass hierarchy is under construction. A new kind of large area microchannel-plate photomultiplier tube (MCP-PMT) was put forward for JUNO by researchers Institute High Energy Physics (IHEP) China. After breaking through several core technotical barriers, 20-inch MCP-PMT prototype with great performance successfully produced group and got 75% PMT orders (15,000 pics) from JUNO. production...
For the next generation neutrino experiment, MCP-PMT collaboration group has done a lot of work in China. After years hard work, we have developed 20" MCP-PMT. The large sensitive area, high quantum efficiency, gain and P/V value for good photon counting performance. detection efficiency will be used detection, got an order 75% PMTs required detection. To this end, also completed mass production line batch test system Nanjing. This presentation introduce improvement
Photocathode surface treatment aims to obtain high sensitivity, where the key point is acquire an atomically clean surface. Various cleaning methods for removing contamination from InGaAs photocathode surfaces were investigated. The atomic compositions of structures and measured by x-ray photoelectron spectroscopy Ar ion sputtering. After cleaning, arsenoxide-free, however, a small amount Ga2O3 In2O3 still can be found. 1:1 mixed solution hydrochloric acid deionized water followed thermal...