Coleman J E
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Rev Sci Instrum. 2016 Dec;87(12):123113. doi: 10.1063/1.4973433.
A pyrometer has been developed to spatially resolve the blackbody temperature of a radiatively cooling warm dense plasma. The pyrometer is composed of a lens coupled fiber array, Czerny-Turner visible spectrometer, and an intensified gated CCD for the detector. The radiatively cooling warm dense plasma is generated by a ∼100-ns-long intense relativistic electron bunch with an energy of 19.1 MeV and a current of 0.2 kA interacting with 100-μm-thick low-Z foils. The continuum spectrum is measured over 250 nm with a low groove density grating. These plasmas emit visible light or blackbody radiation on relatively long time scales (∼0.1 to 100 μs). The diagnostic layout, calibration, and proof-of-principle measurement of a radiatively cooling aluminum plasma is presented, which includes a spatially resolved temperature gradient and the ability to temporally resolve it also.
已开发出一种高温计，用于在空间上分辨辐射冷却的热稠密等离子体的黑体温度。该高温计由一个透镜耦合光纤阵列、切尔尼-特纳可见光谱仪以及用于探测器的增强型门控电荷耦合器件组成。辐射冷却的热稠密等离子体是由一个持续时间约为100纳秒、能量为19.1兆电子伏特、电流为0.2千安的强相对论电子束与100微米厚的低Z箔相互作用产生的。使用低槽密度光栅在250纳米范围内测量连续光谱。这些等离子体在相对较长的时间尺度（约0.1至100微秒）上发射可见光或黑体辐射。本文介绍了辐射冷却铝等离子体的诊断布局、校准和原理验证测量，其中包括空间分辨的温度梯度以及对其进行时间分辨的能力。
