In this paper, different electrical measurement and operation methods of resistive random access memory （RRAM） have been summarized, including voltage sweeping mode （VSM）, current sweeping mode （CSM）, co lstant ...In this paper, different electrical measurement and operation methods of resistive random access memory （RRAM） have been summarized, including voltage sweeping mode （VSM）, current sweeping mode （CSM）, co lstant current stress （CCS）, constant voltage stress （CVS）, rectangular pulse mode （RPM）, and triangle pulse mode （TPM）. Meanwhile, the effects of these meas- urement methods on the forming, set, reset and read operation as well as endurance performance have been compared. Finally, their respective controllability of various resistive switching parameters have been summar zeal and analyzed.展开更多
Purpose Streak camera is an important device for bunch length measurement.The errors introduced by streak camera should be considered in measurement.In order to accurately measure bunch length,some streak camera calib...Purpose Streak camera is an important device for bunch length measurement.The errors introduced by streak camera should be considered in measurement.In order to accurately measure bunch length,some streak camera calibrations are studied at BEPC II.Methods In this context,the point spread function,caused by the optical system,is measured at focus mode with both deflec-tions disabled.In the same conditions,the influence of camera gain on measurement is studied.For the dual sweep mode of streak camera,a calibration method using electrical delays is applied to calibrate the beam size result.Results Firstly,a point spread function calibration 1.78 ps of streak camera optical system is obtained with focus mode.Secondly,studying the effect of camera gain on measurement,an optimal camera gain range from 506 to 662 is selected,in which the bunch length measurement error is within 0.5 ps.Thirdly,a dual sweep calibration factor 1.02 is obtained.Conclusions For BEPCII bunch length,there is a little difference before and after the streak camera calibrations.However,for the accurate measurement of ultra-short bunch length,the calibrations are of great significance.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.61322408,61221004,61422407,61334007,61474136,61274091,61376112,61306117,61106119,and 61106082)National Basic Research Program of China(Grant No.2011CBA00602)National High Technology Research and Development Program of China(Grant Nos.2014AA032900,2013AA030801,2011AA010401 and 2011AA-010402)
文摘In this paper, different electrical measurement and operation methods of resistive random access memory （RRAM） have been summarized, including voltage sweeping mode （VSM）, current sweeping mode （CSM）, co lstant current stress （CCS）, constant voltage stress （CVS）, rectangular pulse mode （RPM）, and triangle pulse mode （TPM）. Meanwhile, the effects of these meas- urement methods on the forming, set, reset and read operation as well as endurance performance have been compared. Finally, their respective controllability of various resistive switching parameters have been summar zeal and analyzed.
文摘Purpose Streak camera is an important device for bunch length measurement.The errors introduced by streak camera should be considered in measurement.In order to accurately measure bunch length,some streak camera calibrations are studied at BEPC II.Methods In this context,the point spread function,caused by the optical system,is measured at focus mode with both deflec-tions disabled.In the same conditions,the influence of camera gain on measurement is studied.For the dual sweep mode of streak camera,a calibration method using electrical delays is applied to calibrate the beam size result.Results Firstly,a point spread function calibration 1.78 ps of streak camera optical system is obtained with focus mode.Secondly,studying the effect of camera gain on measurement,an optimal camera gain range from 506 to 662 is selected,in which the bunch length measurement error is within 0.5 ps.Thirdly,a dual sweep calibration factor 1.02 is obtained.Conclusions For BEPCII bunch length,there is a little difference before and after the streak camera calibrations.However,for the accurate measurement of ultra-short bunch length,the calibrations are of great significance.
