Ross J S, Glenzer S H, Palastro J P, Pollock B B, Price D, Tynan G R, Froula D H
Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551, USA.
Rev Sci Instrum. 2010 Oct;81(10):10D523. doi: 10.1063/1.3478975.
We present simultaneous Thomson-scattering measurements of light scattered from ion-acoustic and electron-plasma fluctuations in a N(2) gas jet plasma. By varying the plasma density from 1.5×10(18) to 4.0×10(19) cm(-3) and the temperature from 100 to 600 eV, we observe the transition from the collective regime to the noncollective regime in the high-frequency Thomson-scattering spectrum. These measurements allow an accurate local measurement of fundamental plasma parameters: electron temperature, density, and ion temperature. Furthermore, experiments performed in the high densities typically found in laser produced plasmas result in scattering from electrons moving near the phase velocity of the relativistic plasma waves. Therefore, it is shown that even at low temperatures relativistic corrections to the scattered power must be included.
我们展示了在氮气气体喷射等离子体中对离子声波和电子等离子体涨落散射光的同时汤姆逊散射测量。通过将等离子体密度从(1.5×10^{18})变化到(4.0×10^{19}\ cm^{-3})，以及将温度从(100)变化到(600\ eV)，我们在高频汤姆逊散射光谱中观察到从集体模式到非集体模式的转变。这些测量允许对基本等离子体参数进行精确的局部测量：电子温度、密度和离子温度。此外，在激光产生的等离子体中通常发现的高密度下进行的实验导致电子在相对论性等离子体波的相速度附近移动时发生散射。因此，结果表明即使在低温下，也必须包括对散射功率的相对论修正。
