用于DIII-D的广角ITER原型切向红外和可见光观测系统。

Wide-angle ITER-prototype tangential infrared and visible viewing system for DIII-D.

作者信息

Lasnier C J, Allen S L, Ellis R E, Fenstermacher M E, McLean A G, Meyer W H, Morris K, Seppala L G, Crabtree K, Van Zeeland M A

机构信息

Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA.

College of Optics, University of Arizona, Tucson, Arizona 85721, USA.

出版信息

Rev Sci Instrum. 2014 Nov;85(11):11D855. doi: 10.1063/1.4892897.

DOI:10.1063/1.4892897

PMID:25430268

Abstract

An imaging system with a wide-angle tangential view of the full poloidal cross-section of the tokamak in simultaneous infrared and visible light has been installed on DIII-D. The optical train includes three polished stainless steel mirrors in vacuum, which view the tokamak through an aperture in the first mirror, similar to the design concept proposed for ITER. A dichroic beam splitter outside the vacuum separates visible and infrared (IR) light. Spatial calibration is accomplished by warping a CAD-rendered image to align with landmarks in a data image. The IR camera provides scrape-off layer heat flux profile deposition features in diverted and inner-wall-limited plasmas, such as heat flux reduction in pumped radiative divertor shots. Demonstration of the system to date includes observation of fast-ion losses to the outer wall during neutral beam injection, and shows reduced peak wall heat loading with disruption mitigation by injection of a massive gas puff.

摘要

一个能同时在红外光和可见光下对托卡马克的全极向截面进行广角切向成像的系统已安装在DIII-D装置上。光学系统包括三个在真空中抛光的不锈钢镜，它们通过第一面镜上的一个孔径观察托卡马克，这与为国际热核聚变实验堆（ITER）提出的设计概念类似。真空中的一个二向色分束器将可见光和红外光分开。空间校准是通过对计算机辅助设计（CAD）渲染图像进行变形，使其与数据图像中的地标对齐来完成的。红外摄像机可提供在偏滤器和内壁限制等离子体中的刮削层热通量分布沉积特征，例如在抽气辐射偏滤器放电中的热通量降低。该系统目前的演示包括在中性束注入期间观察快离子向外壁的损失，并显示通过注入大量气体团来缓解破裂时，峰值壁热负荷降低。