Study on the Control System of Picosecond High-voltage Pulse of Framing Camera
The Microchannel Plate(MCP)and Pulse-dilation Framing Cameras(PDFC)are ultra-fast diagnostic devices,which used to study the spatio-temporal evolution of plasma in the inertial confined fusion.Generally,the control system includes the industrial control system of the streak camera and the group control system of the framing camera.Although both can realize the power on and off,the selection of the DC voltage gear and the monitoring of relevant environmental parameters,they still can not realize the dynamic control of Picosecond High-voltage Pulse(PHVP).Therefore,designing an output performance control system for PHVP generators is not only facilitates an in-depth analysis of the relationship between PHVP and the Temporal Resolution(TR)performance of Framing Camera(FC),but also addressing the lack of dynamic control in the industrial control systems of ultra-fast diagnostic equipment.In order to achieve the control of dynamic performance pulse output,an analysis of the impact of PHVP on the TR of the FC is conducted.Firstly,STM32 master control technology and relays are utilized to design a multi-channel control circuit system.A PHVP generator is designed using the avalanche transistors and the LC high-pass filters,and the two are integrated to achieve control over the PHVP output performance.Subsequently,the photoelectron multiplication model within the MCP channel is established,and the calculation methods for the MCP and PDFC are analyzed.Finally,the PHVP is applied to the study of the TR of the FC,and the influence of dynamic performance of the PHVP on TR is analyzed.In the aspect of study results,the working principle and properties of single chip microcomputer and relay are studied and analyzed.Meanwhile,by combining these two,a multi-channel gating control system is designed.The PHVP generator integrated with the multi-channel gating control system is designed using the avalanche transistors and the LC high-pass filters,it is enabled to produce eight types of V-shaped PHVPs with varying performance characteristics,which the range of the amplitude,the full width at half maximum and the rising slope are-1.212～-1.887 kV,245～327 ps and 3.61～10.01 V/ps,respectively.The Dynamic Multiplication Model of Photoelectrons(DMMP)of MCP is established by Monte Carlo method and the eight V-shaped PHVPs are loaded onto the DMMP.Through the calculation and statistics of the electron gain,the normalized time-gain curve on the MCP is obtained,the impact of the PHVP on the temporal resolution of the MCP framing camera is analyzed.The range of the TR is 95.23～121.79 ps.According to the working principle of PDFC,a calculation method for determining the TR of PDFC is derived.Furthermore,the rising edge of the V-shaped PHVP is utilized for pulse dilation,with consideration of factors such as the TR of the MCP,cathode potential,and drift distance,to investigate the influence of the PHVPs on the TR of PDFC,and the fluctuation range is 1.5～31.4 ps.The multi-channel gating control system is designed by the STM32 microcontroller and relays,the PHVP circuit is constructed using the avalanche triodes and the LC high-pass filters.Meanwhile,by combining these two systems,the multi-channel-controlled of the PHVP generator is built,and the different performance PHVP are applied to the analysis of the temporal resolution of framing camera.The research results are indicated that,the PHVP generator integrated with the multi-channel gating control system can output eight types of V-shaped PHVP.When these pulses are applied to the DMMP of the MCP channel,the TR of the MCP framing camera is obtained.By further integrating the pulses with the cathode voltage and drift distance,and applying them to the PDFC,the TR of the PDFC is obtained.This study provides a new reference direction for improving the functionality of framing camera control systems,especially in terms of dynamic control.It also facilitates an in-depth analysis of the relationship between PHVP and the TR of framing camera.Additionally,it offers a reference method for integrating automatic control technology in the field of ultrafast diagnosis and high-power pulses.In future work,we will continue to conduct in-depth research on the dynamic control system of framing camera,meanwhile,explore new devices and ideas for optimizing picosecond pulse circuits.
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