An intelligent remote control system based on a power distribution unit（PDU） and Arduino has been designed for the electron cyclotron emission imaging（ECEI） system on Experimental Advanced Superconducting Tokamak...An intelligent remote control system based on a power distribution unit（PDU） and Arduino has been designed for the electron cyclotron emission imaging（ECEI） system on Experimental Advanced Superconducting Tokamak（EAST）. This intelligent system has three major functions：ECEI system reboot, measurement region adjustment and signal amplitude optimization. The observation region of ECEI can be modified for different physics proposals by remotely tuning the optical and electronics systems. Via the remote adjustment of the attenuation level, the ECEI intermediate frequency signal amplitude can be efficiently optimized. The remote control system provides a feasible and reliable solution for the improvement of signal quality and the efficiency of the ECEI diagnostic system, which is also valuable for other diagnostic systems.展开更多
The China Fusion Engineering Test Reactor（CFETR） is under design, which aims to bridge the gaps between ITER and the future fusion power plant. The neutron wall loading（NWL） depends on the neutron source distribut...The China Fusion Engineering Test Reactor（CFETR） is under design, which aims to bridge the gaps between ITER and the future fusion power plant. The neutron wall loading（NWL） depends on the neutron source distribution, which depends on the density and temperature profiles. In this paper, we calculate the NWL of CFETR and study the effects of density and temperature profiles on the NWL distribution along the first wall. Our calculations show that for a 200 MW fusion power, the maximum NWL is at the outer midplane and the vaule is about 0.4 MW m^-2. The density and temperature profiles have little effect on the NWL distribution. The value of NWL is determined by the total fusion power.展开更多
Electron cyclotron emission imaging（ECEI） can provide measurements of 2D electron temperature fluctuation with high temporal and spatial resolution in magnetic fusion plasma devices. Two ECEI systems located in diff...Electron cyclotron emission imaging（ECEI） can provide measurements of 2D electron temperature fluctuation with high temporal and spatial resolution in magnetic fusion plasma devices. Two ECEI systems located in different toroidal ports with 67.5 degree separation have been implemented on J-TEXT to study the 3D structure of magnetohydrodynamic（MHD） instabilities. Each system consists of 12（vertical） × 16（horizontal） = 192 channels and the image of the 2nd harmonic X-mode electron cyclotron emission can be captured continuously in the core plasma region. The field curvature adjustment lens concept is developed to control the imaging plane for receiving optics of the ECEI systems. Field curvature of the image can be controlled to match the emission layer. Consequently, a quasi-3D image of the MHD instability in the core of the plasma has been achieved.展开更多
Electron leakage still needs to be solved for In Ga N-based blue-violet laser diodes（LDs）, despite the presence of the electron blocking layer（EBL）. To reduce further electron leakage, a new structure of In Ga N-b...Electron leakage still needs to be solved for In Ga N-based blue-violet laser diodes（LDs）, despite the presence of the electron blocking layer（EBL）. To reduce further electron leakage, a new structure of In Ga N-based LDs with an In Ga N interlayer between the EBL and p-type waveguide layer is designed. The optical and electrical characteristics of these LDs are simulated, and it is found that the adjusted energy band profile in the new structure can improve carrier injection and enhance the effective energy barrier against electron leakage when the In composition of the In Ga N interlayer is properly chosen. As a result, the device performances of the LDs are improved.展开更多
基金supported by National Magnetic Confinement Fusion Energy Program of China(No.2014GB109002)
文摘An intelligent remote control system based on a power distribution unit（PDU） and Arduino has been designed for the electron cyclotron emission imaging（ECEI） system on Experimental Advanced Superconducting Tokamak（EAST）. This intelligent system has three major functions：ECEI system reboot, measurement region adjustment and signal amplitude optimization. The observation region of ECEI can be modified for different physics proposals by remotely tuning the optical and electronics systems. Via the remote adjustment of the attenuation level, the ECEI intermediate frequency signal amplitude can be efficiently optimized. The remote control system provides a feasible and reliable solution for the improvement of signal quality and the efficiency of the ECEI diagnostic system, which is also valuable for other diagnostic systems.
基金supported by the National Magnetic Confinement Fusion Program(Grant Nos.2014GB106001,2014GB110003 and 2013GB111000)by National Natural Science Foundation of China(Grant No.11675221)
文摘The China Fusion Engineering Test Reactor（CFETR） is under design, which aims to bridge the gaps between ITER and the future fusion power plant. The neutron wall loading（NWL） depends on the neutron source distribution, which depends on the density and temperature profiles. In this paper, we calculate the NWL of CFETR and study the effects of density and temperature profiles on the NWL distribution along the first wall. Our calculations show that for a 200 MW fusion power, the maximum NWL is at the outer midplane and the vaule is about 0.4 MW m^-2. The density and temperature profiles have little effect on the NWL distribution. The value of NWL is determined by the total fusion power.
基金supported by the National Magnetic Confinement Fusion Science Program of China under Grant Nos.2013GB106002 and 2014GB109002National Natural Science Foundation of China under Grant Nos.10990210 and 11275200
文摘Electron cyclotron emission imaging（ECEI） can provide measurements of 2D electron temperature fluctuation with high temporal and spatial resolution in magnetic fusion plasma devices. Two ECEI systems located in different toroidal ports with 67.5 degree separation have been implemented on J-TEXT to study the 3D structure of magnetohydrodynamic（MHD） instabilities. Each system consists of 12（vertical） × 16（horizontal） = 192 channels and the image of the 2nd harmonic X-mode electron cyclotron emission can be captured continuously in the core plasma region. The field curvature adjustment lens concept is developed to control the imaging plane for receiving optics of the ECEI systems. Field curvature of the image can be controlled to match the emission layer. Consequently, a quasi-3D image of the MHD instability in the core of the plasma has been achieved.
基金supported by the National Natural Science Foundation of China(Nos.61474110,61377020,61376089,61223005,and 61176126)the National Science Fund for Distinguished Young Scholars(No.60925017)+1 种基金the One Hundred Person Project of the Chinese Academy of Sciencesthe Basic Research Project of Jiangsu Province(No.BK20130362)
文摘Electron leakage still needs to be solved for In Ga N-based blue-violet laser diodes（LDs）, despite the presence of the electron blocking layer（EBL）. To reduce further electron leakage, a new structure of In Ga N-based LDs with an In Ga N interlayer between the EBL and p-type waveguide layer is designed. The optical and electrical characteristics of these LDs are simulated, and it is found that the adjusted energy band profile in the new structure can improve carrier injection and enhance the effective energy barrier against electron leakage when the In composition of the In Ga N interlayer is properly chosen. As a result, the device performances of the LDs are improved.
