In this paper, the nonlinear interaction of ultra-high power laser beam with fusion plasma at relativistic regime in the presence of obliquely external magnetic field has been studied. Imposing an external magnetic fi...In this paper, the nonlinear interaction of ultra-high power laser beam with fusion plasma at relativistic regime in the presence of obliquely external magnetic field has been studied. Imposing an external magnetic field on plasma can modify the density profile of the plasma so that the thermal conductivity of electrons reduces which is considered to be the decrease of the threshold energy for ignition. To achieve the fusion of Hydrogen–Boron(HB) fuel,the block acceleration model of plasma is employed. Energy production by HB isotopes can be of interest, since its reaction does not generate radioactive tritium. By using the inhibit factor in the block model acceleration of plasma and Maxwell's as well as the momentum transfer equations, the electron density distribution and dielectric permittivity of the plasma medium are obtained. Numerical results indicate that with increasing the intensity of the external magnetic field, the oscillation of the laser magnetic field decreases, while the dielectric permittivity increases. Moreover, the amplitude of the electron density becomes highly peaked and the plasma electrons are strongly bunched with increasing the intensity of external magnetic field. Therefore, the magnetized plasma can act as a positive focusing lens to enhance the fusion process. Besides, we find that with increasing θ-angle(from oblique external magnetic field) between 0 and 90°, the dielectric permittivity increases, while for θ between 90° and 180°, the dielectric permittivity decreases with increasing θ.展开更多
"Boundarics in Biomedicine"is a cutting-edge interdisciplinary discipline,which is of great significance for understanding the origin of life,the interaction between internal and external environments,and th..."Boundarics in Biomedicine"is a cutting-edge interdisciplinary discipline,which is of great significance for understanding the origin of life,the interaction between internal and external environments,and the mechanism of disease occurrence and evolution.Here,the definition of Boundarics in Biomedicine is first described,including its connotation,research object,research method,challenges,and future perspectives."Boundarics in Biomedicine"is a cutting-edge interdisciplinary discipline involving multiple fields(e.g.,bioscience,medicine,chemistry,materials science,and information science)dedicated to investigating and solving key scientific questions in the formation,identification,and evolution of living organism boundaries.Specifically,it encompasses 3 levels:(a)the boundary between the living organism and the external environment,(b)internal boundary within living organism,and(c)the boundary related to disease in living organism.The advancement of research in Boundarics in Biomedicine is of great scientific significance for understanding the origin of life,the interaction between internal and external environments,and the mechanism of disease occurrence and evolution,thus providing novel principles,technologies,and methods for early diagnosis and prevention of major diseases,personalized drug development,and prognosis assessment(Fig.1).展开更多
文摘In this paper, the nonlinear interaction of ultra-high power laser beam with fusion plasma at relativistic regime in the presence of obliquely external magnetic field has been studied. Imposing an external magnetic field on plasma can modify the density profile of the plasma so that the thermal conductivity of electrons reduces which is considered to be the decrease of the threshold energy for ignition. To achieve the fusion of Hydrogen–Boron(HB) fuel,the block acceleration model of plasma is employed. Energy production by HB isotopes can be of interest, since its reaction does not generate radioactive tritium. By using the inhibit factor in the block model acceleration of plasma and Maxwell's as well as the momentum transfer equations, the electron density distribution and dielectric permittivity of the plasma medium are obtained. Numerical results indicate that with increasing the intensity of the external magnetic field, the oscillation of the laser magnetic field decreases, while the dielectric permittivity increases. Moreover, the amplitude of the electron density becomes highly peaked and the plasma electrons are strongly bunched with increasing the intensity of external magnetic field. Therefore, the magnetized plasma can act as a positive focusing lens to enhance the fusion process. Besides, we find that with increasing θ-angle(from oblique external magnetic field) between 0 and 90°, the dielectric permittivity increases, while for θ between 90° and 180°, the dielectric permittivity decreases with increasing θ.
基金supported by the National Natural Science Foundation of China(grant nos.T2342011,32025021,and T2222021).
文摘"Boundarics in Biomedicine"is a cutting-edge interdisciplinary discipline,which is of great significance for understanding the origin of life,the interaction between internal and external environments,and the mechanism of disease occurrence and evolution.Here,the definition of Boundarics in Biomedicine is first described,including its connotation,research object,research method,challenges,and future perspectives."Boundarics in Biomedicine"is a cutting-edge interdisciplinary discipline involving multiple fields(e.g.,bioscience,medicine,chemistry,materials science,and information science)dedicated to investigating and solving key scientific questions in the formation,identification,and evolution of living organism boundaries.Specifically,it encompasses 3 levels:(a)the boundary between the living organism and the external environment,(b)internal boundary within living organism,and(c)the boundary related to disease in living organism.The advancement of research in Boundarics in Biomedicine is of great scientific significance for understanding the origin of life,the interaction between internal and external environments,and the mechanism of disease occurrence and evolution,thus providing novel principles,technologies,and methods for early diagnosis and prevention of major diseases,personalized drug development,and prognosis assessment(Fig.1).
