Abstract
Our recent works, which were based on the spectroscopic measurement of strong high frequency electric fields in a plasma, showed that the plasma became a strong Langmuir turbulence state when an intense relativistic electron beam was injected into it. To further confirm this the energy spread and the perpendicular velocity scattering of beam electrons after passing the plasma were measured as well as the strong high frequency electric fields and the electron temperature. The theory of transit-time interactions which deals with the beam scattering in strong Langmuir turbulence was applied to interpret the experimental data. The result again shows that the plasma becomes a strong Langmuir turbulence state. The broadband microwave radiation was also observed simultaneously with the measurement of the perpendicular scattering of the beam electrons. The wider the energy spread and the perpendicular scattering, the stronger the microwave radiation.
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