在通量线圈产生的场反位形上使用3.39μm氦氖激光器的双弦干涉测量法。

Two-chord interferometry using 3.39 μm He-Ne laser on a flux-coil-generated FRC.

作者信息

Gota H, Bolte N, Deng B H, Gupta D, Kiyashko V, Knapp K, Mendoza R, Morehouse M, Roche T, Wessel F

机构信息

Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688, USA.

出版信息

Rev Sci Instrum. 2010 Oct;81(10):10D512. doi: 10.1063/1.3475538.

DOI:10.1063/1.3475538

PMID:21033867

Abstract

A two-chord λ(IR)∼3.39 μm He-Ne laser interferometer system was developed for a flux-coil-generated field-reversed configuration to estimate the electron density and the total temperature of the field-reversed configuration (FRC) plasma. This two-chord heterodyne interferometer system consists of a single ∼2 mW infrared He-Ne laser, a visible (λ(vis)∼632.8 nm) He-Ne laser for the alignment, a 40 MHz acousto-optic modulator, photodetectors, and quadrature phase detectors. Initial measurement was performed and the measured average electron densities were 2-10×10(19) m(-3) at two different radial positions in the midplane. A time shift in density was observed as the FRC expands radially. The time evolution of the line-averaged density agrees with the density estimated from the in situ internal magnetic probes, based on a rigid-rotor profile model.

摘要

为通量线圈产生的场反位形开发了一种双弦λ(IR)∼3.39μm的氦氖激光干涉仪系统，以估算场反位形（FRC）等离子体的电子密度和总温度。这种双弦外差干涉仪系统由一台约2mW的红外氦氖激光器、一台用于对准的可见（λ(vis)∼632.8nm）氦氖激光器、一个40MHz的声光调制器、光电探测器和正交相位探测器组成。进行了初始测量，在中平面的两个不同径向位置测得的平均电子密度为2 - 10×10(19)m(-3)。随着FRC径向扩展，观察到密度的时间偏移。线平均密度的时间演化与根据刚性转子剖面模型从原位内部磁探针估计的密度一致。