Carpenter K R, Mancini R C, Harding E C, Harvey-Thompson A J, Geissel M, Weis M R, Hansen S B, Peterson K J, Rochau G A
Physics Department, University of Nevada, Reno, Nevada 89557, USA.
Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA.
Phys Rev E. 2020 Aug;102(2-1):023209. doi: 10.1103/PhysRevE.102.023209.
We present two-dimensional temperature measurements of magnetized and unmagnetized plasma experiments performed at Z relevant to the preheat stage in magnetized liner inertial fusion. The deuterium gas fill was doped with a trace amount of argon for spectroscopy purposes, and time-integrated spatially resolved spectra and narrow-band images were collected in both experiments. The spectrum and image data were included in two separate multiobjective analysis methods to extract the electron temperature spatial distribution T_{e}(r,z). The results indicate that the magnetic field increases T_{e}, the axial extent of the laser heating, and the magnitude of the radial temperature gradients. Comparisons with simulations reveal that the simulations overpredict the extent of the laser heating and underpredict the temperature. Temperature gradient scale lengths extracted from the measurements also permit an assessment of the importance of nonlocal heat transport.
我们展示了在Z装置上进行的与磁化内衬惯性聚变预热阶段相关的磁化和未磁化等离子体实验的二维温度测量结果。为了光谱分析目的，氘气填充中掺杂了微量氩气，并且在两个实验中都收集了时间积分空间分辨光谱和窄带图像。光谱和图像数据被纳入两种单独的多目标分析方法中，以提取电子温度空间分布Tₑ(r,z)。结果表明，磁场会提高电子温度、激光加热的轴向范围以及径向温度梯度的大小。与模拟结果的比较表明，模拟结果高估了激光加热的范围，低估了温度。从测量中提取的温度梯度标度长度也有助于评估非局部热传输的重要性。
