Introduction In the field of the high injection rate X-ray meterage,currently there are no national standards in China,which are urgently needed in areas such as inertial confinement fusion diagnosis and aerospace obs...Introduction In the field of the high injection rate X-ray meterage,currently there are no national standards in China,which are urgently needed in areas such as inertial confinement fusion diagnosis and aerospace observation.Globally,many metrology laboratories have developed their own meterage standards based on Cryogenic radiometers.And one soft X-ray cryogenic radiometer has been installed at 4B7B experiment station on Beijing Synchrotron Radiation Facility to measure the X-ray power from 50 nW to 1μW.Purpose The purpose is to verify the accuracy of the X-ray power measurement and the performance of the cryogenic radiometer.Experimental The spectral responsivity of a Si photodiode detector calibrated in the Physikalisch-Technische Bundesanstalt of Germany is calibrated at 750eV again with the cryogenic radiometer based on synchrotron light source.Results Some important performance parameters(e.g.,time constant,responsivity,and nonequivalence error)of the cryogenic radiometer were measured and were in agreement with the design indexes.Calibration results show that total relative uncertainties of X-ray power measurement were below 1%(k=1),and that good consistency was received compared with the calibrations done by the PTB.Conclusion The cryogenic radiometer built at 4B7B is reliable and accurate for soft X-ray power measurement.And the performance of the cryogenic radiometer is also very good.展开更多
基金This work was supported by the National Science Instruments Major Project of China(Grant No.2012YQ130125)National Science Foundation of China(Grant No.11375227).
文摘Introduction In the field of the high injection rate X-ray meterage,currently there are no national standards in China,which are urgently needed in areas such as inertial confinement fusion diagnosis and aerospace observation.Globally,many metrology laboratories have developed their own meterage standards based on Cryogenic radiometers.And one soft X-ray cryogenic radiometer has been installed at 4B7B experiment station on Beijing Synchrotron Radiation Facility to measure the X-ray power from 50 nW to 1μW.Purpose The purpose is to verify the accuracy of the X-ray power measurement and the performance of the cryogenic radiometer.Experimental The spectral responsivity of a Si photodiode detector calibrated in the Physikalisch-Technische Bundesanstalt of Germany is calibrated at 750eV again with the cryogenic radiometer based on synchrotron light source.Results Some important performance parameters(e.g.,time constant,responsivity,and nonequivalence error)of the cryogenic radiometer were measured and were in agreement with the design indexes.Calibration results show that total relative uncertainties of X-ray power measurement were below 1%(k=1),and that good consistency was received compared with the calibrations done by the PTB.Conclusion The cryogenic radiometer built at 4B7B is reliable and accurate for soft X-ray power measurement.And the performance of the cryogenic radiometer is also very good.
