24 January 2008 Design of quantum efficiency measurement system for variable doping GaAs photocathode
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Abstract
To achieve high quantum efficiency and good stability has been a main direction to develop GaAs photocathode recently. Through early research, we proved that variable doping structure is executable and practical, and has great potential. In order to optimize variable doping GaAs photocathode preparation techniques and study the variable doping theory deeply, a real-time quantum efficiency measurement system for GaAs Photocathode has been designed. The system uses FPGA (Field-programmable gate array) device, and high speed A/D converter to design a high signal noise ratio and high speed data acquisition card. ARM (Advanced RISC Machines) core processor s3c2410 and real-time embedded system are used to obtain and show measurement results. The measurement precision of photocurrent could reach 1nA, and measurement range of spectral response curve is within 400~1000nm. GaAs photocathode preparation process can be real-time monitored by using this system. This system could easily be added other functions to show the physic variation of photocathode during the preparation process more roundly in the future.
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Liang Chen, Liang Chen, Kai Yang, Kai Yang, HongLin Liu, HongLin Liu, Benkang Chang, Benkang Chang, } "Design of quantum efficiency measurement system for variable doping GaAs photocathode", Proc. SPIE 6829, Advanced Materials and Devices for Sensing and Imaging III, 68291G (24 January 2008); doi: 10.1117/12.756230; https://doi.org/10.1117/12.756230
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