The cosmic-ray particles of TeV-regime, outside the solar system are blocked in their way to the Earth, a deficit of particles is observed corresponding to the location of the Sun known as the Sun shadow. The center o...The cosmic-ray particles of TeV-regime, outside the solar system are blocked in their way to the Earth, a deficit of particles is observed corresponding to the location of the Sun known as the Sun shadow. The center of the Sun shadow is shifted from its nominal position due to the presence of magnetic fields in interplanetary space,and this shift is used indirectly as a probe to study the solar magnetic field that is difficult to measure otherwise.A detailed Monte Carlo simulation of galactic cosmic-ray propagation in the Earth-Sun system is carried out to disentangle the cumulative effects of solar, interplanetary and geomagnetic fields. The shadowing effects and the displacements results of the Sun shadow in different solar activities are reproduced and discussed.展开更多
The indium activation diagnostic was calibrated using an accelerator neutron source to facilitate the diagnosis of deuterium-deuterium（DD）neutron yields of implosion experiments in the Shenguang-III facility.The sca...The indium activation diagnostic was calibrated using an accelerator neutron source to facilitate the diagnosis of deuterium-deuterium（DD）neutron yields of implosion experiments in the Shenguang-III facility.The scattered neutron background of the accelerator room was measured by placing a polypropylene shadow bar in front of the indium sample,so as to correct the calibrated factor of this activation diagnostic.The proper size of the shadow bar was given by Monte Carlo simulation.The calibration results showed that the scattered neutron background of the accelerator room was about 9%of the incident neutrons on the sample.Subtracting the portion induced by the neutron background,the calibrated factor for this sample condition was4.52×10^（-7）counts/n with an uncertainty of 4.3%.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 11675187the Specialized Research Fund for State Key Laboratoriesthe CAS-TWAS President Fellowship Programme
文摘The cosmic-ray particles of TeV-regime, outside the solar system are blocked in their way to the Earth, a deficit of particles is observed corresponding to the location of the Sun known as the Sun shadow. The center of the Sun shadow is shifted from its nominal position due to the presence of magnetic fields in interplanetary space,and this shift is used indirectly as a probe to study the solar magnetic field that is difficult to measure otherwise.A detailed Monte Carlo simulation of galactic cosmic-ray propagation in the Earth-Sun system is carried out to disentangle the cumulative effects of solar, interplanetary and geomagnetic fields. The shadowing effects and the displacements results of the Sun shadow in different solar activities are reproduced and discussed.
文摘The indium activation diagnostic was calibrated using an accelerator neutron source to facilitate the diagnosis of deuterium-deuterium（DD）neutron yields of implosion experiments in the Shenguang-III facility.The scattered neutron background of the accelerator room was measured by placing a polypropylene shadow bar in front of the indium sample,so as to correct the calibrated factor of this activation diagnostic.The proper size of the shadow bar was given by Monte Carlo simulation.The calibration results showed that the scattered neutron background of the accelerator room was about 9%of the incident neutrons on the sample.Subtracting the portion induced by the neutron background,the calibrated factor for this sample condition was4.52×10^（-7）counts/n with an uncertainty of 4.3%.
