A whole circuit model of a linear transformer drivers （LTD） module composed of 60 cavities in series was developed in the software PSPICE to study the influence of switching jitter on the operational performances of...A whole circuit model of a linear transformer drivers （LTD） module composed of 60 cavities in series was developed in the software PSPICE to study the influence of switching jitter on the operational performances of LTDs. In the model, each brick in each cavity is capable of operating with jitter in its switch. Additionally, the manner of triggering cables entering into cavities was considered. The performances of the LTD module operating with three typical cavity-triggering sequences were simulated and the simulation results indicate that switching jitter affects slightly the peak and starting time of the output current pulse. However, the enhancement in switching jitter would significantly lengthen the rise time of the output current pulse. Without considering other factors, a jitter lower than 10 ns may be necessary for the switches in the LTD module to provide output current parameters with an acceptable deviation.展开更多
To measure the jitter performance of the Tirthy Meter Telescope tertary mirror( TMT M3),the model of jitter based on the accerleration signal is established. First and foremost,the procedure TMT required to processs t...To measure the jitter performance of the Tirthy Meter Telescope tertary mirror( TMT M3),the model of jitter based on the accerleration signal is established. First and foremost,the procedure TMT required to processs the jitter data is presented. Then,the jitter of the system is divided into two parts: powered jitter and unpowered jitter. The metric of the jitter is required to be in the form of displacement or angle. So the frequency integration is involved to minify the error source introduced by the tending iterm in the time domain integration.In the evaluation of the power jitter,the accelerometers are used to obtain the rigid body motion of the tertiary mirror. The random decrement technique and dominated mode theory are applied to obtain the model of unpowered jitter. A classical telescope performances a 1. 6"RMS jitter metric; for a four meter scale system,the resonance frequency is around 107 Hz,powering,with 0. 14% damping. Consequently,the tip( 183 Hz,0.6%) and tilt( 193 Hz,0.19%) are both be measured. Using this model,the system engineers can estimate the unpowered jitter when the system is presented in the distortion.展开更多
基金supported partly by National Natural Science Foundation of China(Nos.50637010,51077111)partly by the State Key Laboratory of Electrical Insulation and Power Equipment of Xi'an Jiaotong University of China(EIPE09207)
文摘A whole circuit model of a linear transformer drivers （LTD） module composed of 60 cavities in series was developed in the software PSPICE to study the influence of switching jitter on the operational performances of LTDs. In the model, each brick in each cavity is capable of operating with jitter in its switch. Additionally, the manner of triggering cables entering into cavities was considered. The performances of the LTD module operating with three typical cavity-triggering sequences were simulated and the simulation results indicate that switching jitter affects slightly the peak and starting time of the output current pulse. However, the enhancement in switching jitter would significantly lengthen the rise time of the output current pulse. Without considering other factors, a jitter lower than 10 ns may be necessary for the switches in the LTD module to provide output current parameters with an acceptable deviation.
基金Sponsored by the National Natural Science Foundation of China(Grant No.11403022)
文摘To measure the jitter performance of the Tirthy Meter Telescope tertary mirror( TMT M3),the model of jitter based on the accerleration signal is established. First and foremost,the procedure TMT required to processs the jitter data is presented. Then,the jitter of the system is divided into two parts: powered jitter and unpowered jitter. The metric of the jitter is required to be in the form of displacement or angle. So the frequency integration is involved to minify the error source introduced by the tending iterm in the time domain integration.In the evaluation of the power jitter,the accelerometers are used to obtain the rigid body motion of the tertiary mirror. The random decrement technique and dominated mode theory are applied to obtain the model of unpowered jitter. A classical telescope performances a 1. 6"RMS jitter metric; for a four meter scale system,the resonance frequency is around 107 Hz,powering,with 0. 14% damping. Consequently,the tip( 183 Hz,0.6%) and tilt( 193 Hz,0.19%) are both be measured. Using this model,the system engineers can estimate the unpowered jitter when the system is presented in the distortion.
