Pablant N A, Burrell K H, Groebner R J, Holcomb C T, Kaplan D H
University of California-San Diego, La Jolla, California 92093, USA.
Rev Sci Instrum. 2010 Oct;81(10):10D729. doi: 10.1063/1.3491209.
Results are presented from the B-Stark diagnostic installed on the DIII-D tokamak. This diagnostic provides measurements of the magnitude and direction of the internal magnetic field. The B-Stark system is a version of a motional Stark effect (MSE) diagnostic based on the relative line intensities and spacing of the Stark split D(α) emission from injected neutral beams. This technique may have advantages over MSE polarimetry based diagnostics in future devices, such as the ITER. The B-Stark diagnostic technique and calibration procedures are discussed. The system is shown to provide accurate measurements of B(θ)/B(T) and ∣B∣ over a range of plasma conditions. Measurements have been made with toroidal fields in the range of 1.2-2.1 T, plasma currents in the range 0.5-2.0 MA, densities between 1.7 and 9.0×10(19) m(-3), and neutral beam voltages between 50 and 81 keV. The viewing direction and polarization dependent transmission properties of the collection optics are found using an in situ beam into gas calibration. These results are compared to values found from plasma equilibrium reconstructions and the MSE polarimetry system on DIII-D.
给出了安装在DIII-D托卡马克上的B-Stark诊断装置的结果。该诊断装置可测量内部磁场的大小和方向。B-Stark系统是一种基于注入中性束的斯塔克分裂D(α)发射的相对谱线强度和间距的运动斯塔克效应（MSE）诊断装置的版本。在未来的装置（如国际热核聚变实验堆ITER）中，该技术可能比基于MSE偏振测量的诊断方法具有优势。文中讨论了B-Stark诊断技术和校准程序。结果表明，该系统能在一系列等离子体条件下准确测量B(θ)/B(T)和∣B∣。测量时的环向场范围为1.2 - 2.1 T，等离子体电流范围为0.5 - 2.0 MA，密度在1.7至9.0×10(19) m(-3)之间，中性束电压在50至81 keV之间。利用原位束流进入气体校准法确定了收集光学系统的视向和偏振相关传输特性。将这些结果与通过等离子体平衡重建以及DIII-D上的MSE偏振测量系统得到的值进行了比较。
