- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Design, Development, and Operation of Seven Channels' 100-GHz Interferometer for Plasma Density Measurement
摘要： A seven-channel microwave interferometer (100 GHz) is designed, developed, and used to measure the radial profile of the plasma density (ne) in Aditya tokamak. The resolution of the density measurement is ne = 2 × 10^11 cm^-3. The spatial and time resolutions are 7 cm and 10 μs, respectively. The chord-averaged measurements from seven channels are Abel inverted to obtain the radial profile of the plasma density. Plasma density measured by the microwave interferometer is well matched with that measured by the Thomson scattering diagnostics.
关键词： Density measurements,interferometry,plasma measurements,microwave circuits
更新于2025-09-23 15:22:29
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[IEEE 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Daejeon, Korea (South) (2019.7.28-2019.8.1)] 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Monolithic integration of III-V microdisk lasers on silicon
摘要： Channel electron multiplier (CEM) and microchannel plate (MCP) detectors are routinely used in space instrumentation for measurement of space plasmas. Our goal is to understand the relative sensitivities of these detectors to penetrating radiation in space, which can generate background counts and shorten detector lifetime. We use keV -rays as a proxy for penetrating radiation such as -rays, cosmic rays, and high-energy electrons and protons that are ubiquitous in the space environment. We ?nd that MCP detectors are times more sensitive to keV -rays than CEM detectors. This is attributed to the larger total area of multiplication channels in an MCP detector that is sensitive to electronic excitation and ionization resulting from the interaction of penetrating radiation with the detector material. In contrast to the CEM detector, whose quantum ef?ciency keV -rays is found to be 0.00175 and largely independent of detector bias, the quantum ef?ciency of the MCP detector is strongly dependent on the detector bias, with a power law index of 5.5. Background counts in MCP detectors from penetrating radiation can be reduced using MCP geometries with higher pitch and smaller channel diameter.
关键词： radiation effects,Electron multipliers,gamma-ray effects,plasma measurements
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 5th International Conference on Wireless and Telematics (ICWT) - Yogyakarta, Indonesia (2019.7.25-2019.7.26)] 2019 IEEE 5th International Conference on Wireless and Telematics (ICWT) - The Behavioral Study of an Optical Injection-Locked Semiconductor Laser under the Influence of Intensity and Phase Noise
摘要： Channel electron multiplier (CEM) and microchannel plate (MCP) detectors are routinely used in space instrumentation for measurement of space plasmas. Our goal is to understand the relative sensitivities of these detectors to penetrating radiation in space, which can generate background counts and shorten detector lifetime. We use keV -rays as a proxy for penetrating radiation such as -rays, cosmic rays, and high-energy electrons and protons that are ubiquitous in the space environment. We find that MCP detectors are times more sensitive to keV -rays than CEM detectors. This is attributed to the larger total area of multiplication channels in an MCP detector that is sensitive to electronic excitation and ionization resulting from the interaction of penetrating radiation with the detector material. In contrast to the CEM detector, whose quantum efficiency keV -rays is found to be 0.00175 and largely independent of detector bias, the quantum efficiency of the MCP detector is strongly dependent on the detector bias, with a power law index of 5.5. Background counts in MCP detectors from penetrating radiation can be reduced using MCP geometries with higher pitch and smaller channel diameter.
关键词： gamma-ray effects,radiation effects,plasma measurements,Electron multipliers
更新于2025-09-19 17:13:59