In a relativistic electron cyclotron maser with an axisymmetrical quasioptical cavity of oblique rotation at arbitrary angle,the rotating angle has a great influence on beam-wave interaction.Two different physical mec...In a relativistic electron cyclotron maser with an axisymmetrical quasioptical cavity of oblique rotation at arbitrary angle,the rotating angle has a great influence on beam-wave interaction.Two different physical mechanisms are found with the rotating angle ranging from 0°to 90°.One is cyclotron auto-resonance maser regime for small angle,with small optimized external magnetic field;the other is electron cyclotron resonance maser regime for large angle,with comparatively large optimized magnetic field.展开更多
The particle confinement property of LHCD(lower hybrid current drive)plasma on the HL-1 tokamak is mainly affected by the line-averaged density of electrons(ne).With ne<2.0 × 10^(13)cm^(-3) the particle confin...The particle confinement property of LHCD(lower hybrid current drive)plasma on the HL-1 tokamak is mainly affected by the line-averaged density of electrons(ne).With ne<2.0 × 10^(13)cm^(-3) the particle confinement time(TP)is improved with the suppression of Hα(Dα)fluctuation at the edge,and tends to increase with the power PLH.The peak of Tp appears near the critical density(1.0×10^(13)cm^(-3)).These results are not influenced by the current drive directions.展开更多
Using kinetic coupling mode theory of three waves,the effect of longitudinal momentum spread in ion-ripple laser(IRL),which is an advanced new scheme to generate tunable-coherent radiation with frequency ranging from ...Using kinetic coupling mode theory of three waves,the effect of longitudinal momentum spread in ion-ripple laser(IRL),which is an advanced new scheme to generate tunable-coherent radiation with frequency ranging from microwaves to x-rays,is investigated.For a Gaussian distribution in beam longitudinal momentum,the results show that the growth rate of IRL falls off rapidly with increasing momentum spread,and the momentum spread causes linear damping of beam space-charge wave,weakening the beam-radiation mode coupling and lowering the output radiation frequency apart from broadening the radiation spectrum.The dispersion relation and phase matching conditions are also obtained.展开更多
基金Supported by the Doctoral Fund of the State Education Committee of China.
文摘In a relativistic electron cyclotron maser with an axisymmetrical quasioptical cavity of oblique rotation at arbitrary angle,the rotating angle has a great influence on beam-wave interaction.Two different physical mechanisms are found with the rotating angle ranging from 0°to 90°.One is cyclotron auto-resonance maser regime for small angle,with small optimized external magnetic field;the other is electron cyclotron resonance maser regime for large angle,with comparatively large optimized magnetic field.
文摘The particle confinement property of LHCD(lower hybrid current drive)plasma on the HL-1 tokamak is mainly affected by the line-averaged density of electrons(ne).With ne<2.0 × 10^(13)cm^(-3) the particle confinement time(TP)is improved with the suppression of Hα(Dα)fluctuation at the edge,and tends to increase with the power PLH.The peak of Tp appears near the critical density(1.0×10^(13)cm^(-3)).These results are not influenced by the current drive directions.
文摘Using kinetic coupling mode theory of three waves,the effect of longitudinal momentum spread in ion-ripple laser(IRL),which is an advanced new scheme to generate tunable-coherent radiation with frequency ranging from microwaves to x-rays,is investigated.For a Gaussian distribution in beam longitudinal momentum,the results show that the growth rate of IRL falls off rapidly with increasing momentum spread,and the momentum spread causes linear damping of beam space-charge wave,weakening the beam-radiation mode coupling and lowering the output radiation frequency apart from broadening the radiation spectrum.The dispersion relation and phase matching conditions are also obtained.
