Spectroscopic Measurements of Intense Relativistic Electron Beam Driven Turbulence

概要

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High frequency strong electric fields originating from interaction of an intense short-pulse relativistic electron beam with an unmagnetized plasma were measured using two optical diagnostic techniques ; the Stark shift measurement and the plasma satellite method. Strong electric fields with Gaussian distribution existed in the plasma. The dimensionless electrostatic energy density W〜1.1. So the plasma was in a strong Langmuir turbulent state. The strong field regions were found to occupy a few percent of the beam volume. The final scale of caviton was determined to be about 22 λ_D. The turbulent state lasted about thirty times as long as the IREB duration. The photon intensity decreased exponentially, while the distribution of electric fields remained the same. These aspects are remain to be explored further.
社団法人日本物理学会の論文
1994-09-15