The γ-rays with energies up to 300keV have been observed from plasmas produced by femtosecond laser pulses at a focused intensity of 5 × 10^(15) W.cm^(-2).μm^(2) irradiating Ta,Mo,and Cu targets.By introducing ...The γ-rays with energies up to 300keV have been observed from plasmas produced by femtosecond laser pulses at a focused intensity of 5 × 10^(15) W.cm^(-2).μm^(2) irradiating Ta,Mo,and Cu targets.By introducing an 8% prepulse of 70ps before the main pulse,the fraction of high energy γ-ray photons(hv>l00keV)was significantly enhanced relative to low energy photons(hv<100 keV).展开更多
Spectroscopy of vacuum ultraviolet(VUV)radiation emitted by intrinsic and injected impurities in tokamak plasma is an important plasma diagnostic tool.Much information of impurity concentration,radiation loss,the effe...Spectroscopy of vacuum ultraviolet(VUV)radiation emitted by intrinsic and injected impurities in tokamak plasma is an important plasma diagnostic tool.Much information of impurity concentration,radiation loss,the effective ion charge(z_(eff)),particle transport and other quantities which may affect the behavior of the discharge can be obtained from the measurements of VUV line radiation.展开更多
An electron cyclotron resonance heating experiment has been performed by using a gyrotron system for the fundamental and second harmonic resonance heating on CT-6B tokamak.Obvious changes are observed in soft X-ray ra...An electron cyclotron resonance heating experiment has been performed by using a gyrotron system for the fundamental and second harmonic resonance heating on CT-6B tokamak.Obvious changes are observed in soft X-ray radiations,electron cyclotron emission,displacement of plasma column,impurity line radiations,and bremsstrahlung radiation when heating pulse is injected,indicating an increase of the plasma electron temperature.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19854001the National High Technology ICF Committee under Grant No.416-3.
文摘The γ-rays with energies up to 300keV have been observed from plasmas produced by femtosecond laser pulses at a focused intensity of 5 × 10^(15) W.cm^(-2).μm^(2) irradiating Ta,Mo,and Cu targets.By introducing an 8% prepulse of 70ps before the main pulse,the fraction of high energy γ-ray photons(hv>l00keV)was significantly enhanced relative to low energy photons(hv<100 keV).
文摘Spectroscopy of vacuum ultraviolet(VUV)radiation emitted by intrinsic and injected impurities in tokamak plasma is an important plasma diagnostic tool.Much information of impurity concentration,radiation loss,the effective ion charge(z_(eff)),particle transport and other quantities which may affect the behavior of the discharge can be obtained from the measurements of VUV line radiation.
文摘An electron cyclotron resonance heating experiment has been performed by using a gyrotron system for the fundamental and second harmonic resonance heating on CT-6B tokamak.Obvious changes are observed in soft X-ray radiations,electron cyclotron emission,displacement of plasma column,impurity line radiations,and bremsstrahlung radiation when heating pulse is injected,indicating an increase of the plasma electron temperature.
