In proton radiography,degeneracy of electric and magnetic fields in deflecting the probe protons can prevent full interpretation of proton flux perturbations in the detection plane.In this paper,theoretical analyses a...In proton radiography,degeneracy of electric and magnetic fields in deflecting the probe protons can prevent full interpretation of proton flux perturbations in the detection plane.In this paper,theoretical analyses and numerical simulations suggest that the contributions of the electric and magnetic fields can be separately obtained by analyzing the difference between the flux distributions of two discriminated proton energies in a single shot of proton radiography.To eliminate the influence of field evolution on the separation,a strategy is proposed in which slow field evolution is assumed or an approximate estimate of field growth is made.This could help achieve a clearer understanding of the radiographic process and allow further quantitative analysis.展开更多
The Weibel instability and the induced magnetic field are of great importance for both astrophysics and inertial confinement fusion.Because of the stochasticity of this magnetic field,its main wavelength and mean stre...The Weibel instability and the induced magnetic field are of great importance for both astrophysics and inertial confinement fusion.Because of the stochasticity of this magnetic field,its main wavelength and mean strength,which are key characteristics of the Weibel instability,are still unobtainable experimentally.In this paper,a theoretical model based on the autocorrelation tensor shows that in proton radiography of the Weibel-instability-induced magnetic field,the proton flux density on the detection plane can be related to the energy spectrum of the magnetic field.It allows us to extract the main wavelength and mean strength of the two-dimensionally isotropic and stochastic magnetic field directly from proton radiography for the first time.Numerical calculations are conducted to verify our theory and show good consistency between pre-set values and the results extracted from proton radiography.展开更多
基金supported by the Science Challenge Project(No.TZ2016005)the China Postdoctoral Science Foundation(No.2019M660559)+1 种基金the National Natural Science Foundation of China[Grant Nos.11975055 and U1730449(NSAF)]the National Key Programme for S&T Research and Development in China(Grant No.2016YFA0401100).
文摘In proton radiography,degeneracy of electric and magnetic fields in deflecting the probe protons can prevent full interpretation of proton flux perturbations in the detection plane.In this paper,theoretical analyses and numerical simulations suggest that the contributions of the electric and magnetic fields can be separately obtained by analyzing the difference between the flux distributions of two discriminated proton energies in a single shot of proton radiography.To eliminate the influence of field evolution on the separation,a strategy is proposed in which slow field evolution is assumed or an approximate estimate of field growth is made.This could help achieve a clearer understanding of the radiographic process and allow further quantitative analysis.
基金supported by the Science Challenge Project (No. TZ2016005)the National Natural Science Foundation of China (Nos. 11575030 and U1730449 (NSAF))the National Key Programme for S&T Research and Development in China (No. 2016YFA0401100)
文摘The Weibel instability and the induced magnetic field are of great importance for both astrophysics and inertial confinement fusion.Because of the stochasticity of this magnetic field,its main wavelength and mean strength,which are key characteristics of the Weibel instability,are still unobtainable experimentally.In this paper,a theoretical model based on the autocorrelation tensor shows that in proton radiography of the Weibel-instability-induced magnetic field,the proton flux density on the detection plane can be related to the energy spectrum of the magnetic field.It allows us to extract the main wavelength and mean strength of the two-dimensionally isotropic and stochastic magnetic field directly from proton radiography for the first time.Numerical calculations are conducted to verify our theory and show good consistency between pre-set values and the results extracted from proton radiography.
