Interaction of dynamic magnetic island with bootstrap current in toroidal plasmas is investigated based on the first principles of kinetic simulation.The perturbed magnetic and electric fields associated with the dyna...Interaction of dynamic magnetic island with bootstrap current in toroidal plasmas is investigated based on the first principles of kinetic simulation.The perturbed magnetic and electric fields associated with the dynamic magnetic island are calculated from a three-dimensional toroidal MHD code(CLT),instead of artificial imposed magnetic island perturbation.Inside the static magnetic island,the bootstrap current decreases as expected with the effective collision frequency.The radial electric field Erassociated with dynamic island could cause the E×B drift,which can noticeably modify the bootstrap current distribution.If the bootstrap current turns on when the tearing mode saturates,the widths of magnetic islands ascend rapidly and saturate again for both static and dynamic cases.But the saturated island width of the dynamic case is smaller than that of the static case because the magnetic islands in the dynamic case rotate due to strong asymmetric distribution of the bootstrap current in the vicinity of the X-points.展开更多
In the era of big data,traditional statistical inference methods are faced with great challenges.Taking the two-sample distribution test scenario of big data as an example,this paper proposes the BB-KS test based on m...In the era of big data,traditional statistical inference methods are faced with great challenges.Taking the two-sample distribution test scenario of big data as an example,this paper proposes the BB-KS test based on m out of n bootstrap for solving a single-machine memory and computing constraints.It is verified to the feasibility and effectiveness of the proposed test method through theoretical analysis and numerical simulation.The results show that the BB-KS test can improve the calculation efficiency of the test to a certain extent in the single machine scenario.展开更多
基金supported by the National Key Research and Development Program of China(Nos.2022YFE03100000,2019YFE03020003 and 2019YFE03030004)National Natural Science Foundation of China(Nos.11835010,12305236 and 12375224)Innovation Program of Southwestern Institute of Physics(No.202301XWCX001)。
文摘Interaction of dynamic magnetic island with bootstrap current in toroidal plasmas is investigated based on the first principles of kinetic simulation.The perturbed magnetic and electric fields associated with the dynamic magnetic island are calculated from a three-dimensional toroidal MHD code(CLT),instead of artificial imposed magnetic island perturbation.Inside the static magnetic island,the bootstrap current decreases as expected with the effective collision frequency.The radial electric field Erassociated with dynamic island could cause the E×B drift,which can noticeably modify the bootstrap current distribution.If the bootstrap current turns on when the tearing mode saturates,the widths of magnetic islands ascend rapidly and saturate again for both static and dynamic cases.But the saturated island width of the dynamic case is smaller than that of the static case because the magnetic islands in the dynamic case rotate due to strong asymmetric distribution of the bootstrap current in the vicinity of the X-points.
文摘In the era of big data,traditional statistical inference methods are faced with great challenges.Taking the two-sample distribution test scenario of big data as an example,this paper proposes the BB-KS test based on m out of n bootstrap for solving a single-machine memory and computing constraints.It is verified to the feasibility and effectiveness of the proposed test method through theoretical analysis and numerical simulation.The results show that the BB-KS test can improve the calculation efficiency of the test to a certain extent in the single machine scenario.
