Golingo R P, Shumlak U, Den Hartog D J
Aerospace and Energetics Research Program, University of Washington, Seattle, Washington 98195-2250, USA.
Rev Sci Instrum. 2010 Dec;81(12):126104. doi: 10.1063/1.3509400.
The Zeeman effect has been used for measurement of magnetic fields in low-temperature plasma, but the diagnostic technique is difficult to implement in a high-temperature plasma. This paper describes new instrumentation and methodology for simultaneous measurement of the entire Doppler-broadened left and right circularly polarized Zeeman spectra in high-temperature plasmas. Measurements are made using spectra emitted parallel to the magnetic field by carbon impurities in high-temperature plasma. The Doppler-broadened width is much larger than the magnitude of the Zeeman splitting, thus simultaneous recording of the two circularly polarized Zeeman line profiles is key to accurate measurement of the magnetic field in the ZaP Z-pinch plasma device. Spectral data are collected along multiple chords on both sides of the symmetry axis of the plasma. This enables determination of the location of the current axis of the Z-pinch and of lower-bound estimates of the local magnetic field at specific radial locations in the plasma.
塞曼效应已被用于测量低温等离子体中的磁场，但该诊断技术在高温等离子体中难以实施。本文描述了用于同时测量高温等离子体中整个多普勒展宽的左旋和右旋圆偏振塞曼光谱的新仪器和方法。测量是利用高温等离子体中碳杂质平行于磁场发射的光谱进行的。多普勒展宽宽度远大于塞曼分裂的幅度，因此同时记录两个圆偏振塞曼线轮廓是在ZaP Z箍缩等离子体装置中精确测量磁场的关键。沿着等离子体对称轴两侧的多条弦收集光谱数据。这使得能够确定Z箍缩电流轴的位置以及等离子体中特定径向位置处局部磁场的下限估计值。
