The China Spallation Neutron Source (CSNS) Rapid Cycling Synchrotron (RCS) is a high beam power proton accelerator.The task of RCS injection system is to inject the negative hydrogen ions coming from linac into RCS by...The China Spallation Neutron Source (CSNS) Rapid Cycling Synchrotron (RCS) is a high beam power proton accelerator.The task of RCS injection system is to inject the negative hydrogen ions coming from linac into RCS by stripping method.This power supply demands that its output pulse current falling edge be controlled by the program. The power supply uses the IGBT power amplifying method to generate the pulse current and makes it follow the setting waveform by the power supply's feedback control system.The tracking error is one of the important specifications of the power supply.To satisfy the tracking error less than 2%,the frequency of the IGBT topology requested is more than 400kHz.The IGBT topology is connected by the IGBT H bridges in series and parallel,and works in the phase shifted method to divide the current,the voltage and improve the equivalent frequency.High power,high frequency,fast speed response and optimal feedback control strategy are the key to the good performance of painting bumper magnets pulsed power supply.展开更多
A relatively simple plug-and-play control system of quantum key distribution （QKD） based on PCI7300 card is demonstrated, including mechanism design, key generation and key acquisition. The system works very well at...A relatively simple plug-and-play control system of quantum key distribution （QKD） based on PCI7300 card is demonstrated, including mechanism design, key generation and key acquisition. The system works very well at the repetition frequency of 1 MHz, and the key generation rate is 100 k/s. A visibility of better than 95% over 50 km-long fiber at 1.31 gm is obtained, which is stable under ordinary lab conditions for 24 h without any feedback control or adjustment. The presented system is a quite promising candidate to realize the QKD in the future.展开更多
文摘The China Spallation Neutron Source (CSNS) Rapid Cycling Synchrotron (RCS) is a high beam power proton accelerator.The task of RCS injection system is to inject the negative hydrogen ions coming from linac into RCS by stripping method.This power supply demands that its output pulse current falling edge be controlled by the program. The power supply uses the IGBT power amplifying method to generate the pulse current and makes it follow the setting waveform by the power supply's feedback control system.The tracking error is one of the important specifications of the power supply.To satisfy the tracking error less than 2%,the frequency of the IGBT topology requested is more than 400kHz.The IGBT topology is connected by the IGBT H bridges in series and parallel,and works in the phase shifted method to divide the current,the voltage and improve the equivalent frequency.High power,high frequency,fast speed response and optimal feedback control strategy are the key to the good performance of painting bumper magnets pulsed power supply.
基金supported by the National Natural Science Foundation of China(Nos.61178010and10805006)the Fundamental Research Funds for the Central Universities(No.bupt2010zx04)the China Postdoctoral Science Foundation(No.20100480508)
文摘A relatively simple plug-and-play control system of quantum key distribution （QKD） based on PCI7300 card is demonstrated, including mechanism design, key generation and key acquisition. The system works very well at the repetition frequency of 1 MHz, and the key generation rate is 100 k/s. A visibility of better than 95% over 50 km-long fiber at 1.31 gm is obtained, which is stable under ordinary lab conditions for 24 h without any feedback control or adjustment. The presented system is a quite promising candidate to realize the QKD in the future.
