This paper introduces a hybrid fluid-kinetic code,SHYPIC(ShanghaiTech HYbrid PIC code),developed as a baseline framework for simulating plasma dynamics relevant to plasma-jetdriven magneto-inertial fusion(PJMIF).The c...This paper introduces a hybrid fluid-kinetic code,SHYPIC(ShanghaiTech HYbrid PIC code),developed as a baseline framework for simulating plasma dynamics relevant to plasma-jetdriven magneto-inertial fusion(PJMIF).The code integrates a fluid description for electrons and a particle-in-cell(PIC)description for ions,providing computational efficiency and enabling larger-scale simulations.It incorporates ion kinetic effects,allowing accurate simulation of microscale non-equilibrium phenomena.In this initial version,the SHYPIC code is presented along with a series of benchmark tests,including quiet plasma evolution,dispersion relation verification,and the excitation and propagation of externally driven plasma waves.This version does not yet incorporate collisional effects or non-ideal terms(e.g.,resistivity,viscosity,and hyperviscosity)in the electron fluid,which will be included in future developments.The present work lays the foundation for further improvements required for fully simulating the complex dynamics of PJMIF.展开更多
An atmospheric-pressure carbon dioxide(CO_2) plasma jet(CPJ) produced by alternating current driven non-thermal arc plasma torch is presented.The discharge features of CPJ and their non-linear behavior are analyzed ba...An atmospheric-pressure carbon dioxide(CO_2) plasma jet(CPJ) produced by alternating current driven non-thermal arc plasma torch is presented.The discharge features of CPJ and their non-linear behavior are analyzed based on the temporal evolution of voltage and current.With the increase of gas flowrate,the quantities of the current and voltage spikes increase in an operation cycle of power supply.The spatial gas temperature distribution is obtained by the gray value method,which basically agrees well with that of determined by the diatomic molecule of OH fitting method in experimental errors.展开更多
We report on the concept of an innovative source to produce polarized proton/deuteron beams of a kinetic energy up to several GeV from a laser-driven plasma accelerator. Spin effects have been implemented into the par...We report on the concept of an innovative source to produce polarized proton/deuteron beams of a kinetic energy up to several GeV from a laser-driven plasma accelerator. Spin effects have been implemented into the particle-in-cell(PIC) simulation code VLPL(Virtual Laser Plasma Lab) to make theoretical predictions about the behavior of proton spins in laser-induced plasmas. Simulations of spin-polarized targets show that the polarization is conserved during the acceleration process. For the experimental realization, a polarized HCl gas-jet target is under construction using the fundamental wavelength of a Nd:YAG laser system to align the HCl bonds and simultaneously circularly polarized light of the fifth harmonic to photo-dissociate, yielding nuclear polarized H atoms. Subsequently, their degree of polarization is measured with a Lamb-shift polarimeter. The final experiments, aiming at the first observation of a polarized particle beam from laser-generated plasmas, will be carried out at the 10 PW laser system SULF at SIOM, Shanghai.展开更多
基金supported by the Major National Science and Technology Infrastructure(No.2208-000000-04-01249628)。
文摘This paper introduces a hybrid fluid-kinetic code,SHYPIC(ShanghaiTech HYbrid PIC code),developed as a baseline framework for simulating plasma dynamics relevant to plasma-jetdriven magneto-inertial fusion(PJMIF).The code integrates a fluid description for electrons and a particle-in-cell(PIC)description for ions,providing computational efficiency and enabling larger-scale simulations.It incorporates ion kinetic effects,allowing accurate simulation of microscale non-equilibrium phenomena.In this initial version,the SHYPIC code is presented along with a series of benchmark tests,including quiet plasma evolution,dispersion relation verification,and the excitation and propagation of externally driven plasma waves.This version does not yet incorporate collisional effects or non-ideal terms(e.g.,resistivity,viscosity,and hyperviscosity)in the electron fluid,which will be included in future developments.The present work lays the foundation for further improvements required for fully simulating the complex dynamics of PJMIF.
文摘An atmospheric-pressure carbon dioxide(CO_2) plasma jet(CPJ) produced by alternating current driven non-thermal arc plasma torch is presented.The discharge features of CPJ and their non-linear behavior are analyzed based on the temporal evolution of voltage and current.With the increase of gas flowrate,the quantities of the current and voltage spikes increase in an operation cycle of power supply.The spatial gas temperature distribution is obtained by the gray value method,which basically agrees well with that of determined by the diatomic molecule of OH fitting method in experimental errors.
基金the JuSPARC(Julich Short-Pulse Particle and Radiation Center)projectsupported by the ATHENA(Accelerator Technology HElmholtz iNfrAstructure)consortiumgrant VSR-JPGI61 on the supercomputer JURECA
文摘We report on the concept of an innovative source to produce polarized proton/deuteron beams of a kinetic energy up to several GeV from a laser-driven plasma accelerator. Spin effects have been implemented into the particle-in-cell(PIC) simulation code VLPL(Virtual Laser Plasma Lab) to make theoretical predictions about the behavior of proton spins in laser-induced plasmas. Simulations of spin-polarized targets show that the polarization is conserved during the acceleration process. For the experimental realization, a polarized HCl gas-jet target is under construction using the fundamental wavelength of a Nd:YAG laser system to align the HCl bonds and simultaneously circularly polarized light of the fifth harmonic to photo-dissociate, yielding nuclear polarized H atoms. Subsequently, their degree of polarization is measured with a Lamb-shift polarimeter. The final experiments, aiming at the first observation of a polarized particle beam from laser-generated plasmas, will be carried out at the 10 PW laser system SULF at SIOM, Shanghai.
