HCN单激光器和转动光栅形成的差频信号一般不大于100 k Hz.HCN双激光器较之单激光器和转动光栅系统可以很容易的获得MHz量级的差频信号,进而可以研究更高时间分辨率的物理现象.但是HCN双激光器功率和频率都不稳定,功率稳定是频率稳定的...HCN单激光器和转动光栅形成的差频信号一般不大于100 k Hz.HCN双激光器较之单激光器和转动光栅系统可以很容易的获得MHz量级的差频信号,进而可以研究更高时间分辨率的物理现象.但是HCN双激光器功率和频率都不稳定,功率稳定是频率稳定的前提,所以必须先保证HCN双激光器功率的稳定.本文以稳定功率为目标结合双激光器的特点,设计了一套双激光器功率的自动反馈控制系统及远程控制系统.本系统主要有西门子S7-200PLC、电动平台、肖特基势垒二极管和上位机等组成.实验表明这种方法可以长时间地使HCN双激光器稳定在高功率状态.展开更多
In recent years, the high density plasma in the range of 10^19～ 10^20m^-3 have been operated in large or middle tokamak device in the world. A muhichannel far infrared interferometer for profile measurement of plasma...In recent years, the high density plasma in the range of 10^19～ 10^20m^-3 have been operated in large or middle tokamak device in the world. A muhichannel far infrared interferometer for profile measurement of plasma density on HL-2A divertor tokamak is being developed, however the design of the interferometer will appear many new problem in face of experimental environment of the HL-2A divertor device, such as how to make both transmission and arrangement of optics of the interferometer, the effect of electromo- tive force on device and how about the vibration etc. According to the eight windows setting on the largest flange of the device we have to design a Michelson-type FIR laser interferometer with 8 probing channels and eight concave mirrors must be attached it to the inner wall of the vacuum vessel of the device. Therefore, there are many problems should be taken into account to resolve, for example, （ 1 ） the vibration-proof consider for muhichannel interferometer and HCN laser, （2） the stabilization and reliability of the mirror frame uum vessel, the mirrors, hanging on internal wall of vachow to prevent the sputtering to （3） the vacuum seal of the windows and the design of mobile seal for the shutter to avoid the sputter coating of plasma,展开更多
文摘HCN单激光器和转动光栅形成的差频信号一般不大于100 k Hz.HCN双激光器较之单激光器和转动光栅系统可以很容易的获得MHz量级的差频信号,进而可以研究更高时间分辨率的物理现象.但是HCN双激光器功率和频率都不稳定,功率稳定是频率稳定的前提,所以必须先保证HCN双激光器功率的稳定.本文以稳定功率为目标结合双激光器的特点,设计了一套双激光器功率的自动反馈控制系统及远程控制系统.本系统主要有西门子S7-200PLC、电动平台、肖特基势垒二极管和上位机等组成.实验表明这种方法可以长时间地使HCN双激光器稳定在高功率状态.
文摘In recent years, the high density plasma in the range of 10^19～ 10^20m^-3 have been operated in large or middle tokamak device in the world. A muhichannel far infrared interferometer for profile measurement of plasma density on HL-2A divertor tokamak is being developed, however the design of the interferometer will appear many new problem in face of experimental environment of the HL-2A divertor device, such as how to make both transmission and arrangement of optics of the interferometer, the effect of electromo- tive force on device and how about the vibration etc. According to the eight windows setting on the largest flange of the device we have to design a Michelson-type FIR laser interferometer with 8 probing channels and eight concave mirrors must be attached it to the inner wall of the vacuum vessel of the device. Therefore, there are many problems should be taken into account to resolve, for example, （ 1 ） the vibration-proof consider for muhichannel interferometer and HCN laser, （2） the stabilization and reliability of the mirror frame uum vessel, the mirrors, hanging on internal wall of vachow to prevent the sputtering to （3） the vacuum seal of the windows and the design of mobile seal for the shutter to avoid the sputter coating of plasma,
