用于NSTX-U的高极向散射系统。

The high- poloidal scattering system for NSTX-U.

作者信息

Barchfeld R, Domier C W, Ren Y, Ellis R, Riemenschneider P, Allen N, Kaita R, Stratton B, Dannenberg J, Zhu Y, Luhmann N C

机构信息

Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA.

Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.

出版信息

Rev Sci Instrum. 2018 Oct;89(10):10C114. doi: 10.1063/1.5035410.

DOI:10.1063/1.5035410

PMID:30399655

Abstract

An 8-channel, high- poloidal far-infrared (FIR) scattering system is under development for the National Spherical Torus eXperiment Upgrade (NSTX-U). The 693 GHz poloidal scattering system replaces a 5-channel, 280 GHz high- toroidal scattering system to study high-k electron density fluctuations on NSTX-U. The FIR probe beam launched from Bay G is aimed toward Bay L, where large aperture optics collect radiation at 8 simultaneous scattering angles ranging from 2° to 15°. The reduced wavelength in the poloidal system results in less refraction, and coupled with a new poloidal scattering geometry, extends measurement of poloidal wavenumbers from the previous limit of 7 cm up to >40 cm. Steerable launch optics coupled with receiver optics that can be remotely translated in 5 axes allow the scattering volume to be placed from r/a = 0.1 out to the pedestal region (r/a ∼ 0.99) and allow for both upward and downward scattering to cover different regions of the 2D fluctuation spectrum.

摘要

正在为国家球形托卡马克实验升级计划（NSTX-U）开发一种8通道、高极向远红外（FIR）散射系统。693吉赫兹的极向散射系统取代了一个5通道、280吉赫兹的高环向散射系统，用于研究NSTX-U上的高k电子密度涨落。从G区发射的FIR探测光束指向L区，在那里大孔径光学器件在8个同时测量的散射角（范围从2°到15°）收集辐射。极向系统中波长的减小导致折射减少，再加上新的极向散射几何结构，将极向波数的测量范围从之前的7厘米极限扩展到大于40厘米。可转向的发射光学器件与可在5个轴上远程平移的接收光学器件相结合，使得散射体积能够放置在r/a = 0.1到基座区域（r/a ∼ 0.99）之间，并允许向上和向下散射，以覆盖二维涨落谱的不同区域。