Oh Seungtae, Han Yoonseong, Peterson Byron
Korea Institute of Fusion Energy, 113 Gwahangno, Daejeon, Republic of Korea.
Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Daejeon, Republic of Korea.
Rev Sci Instrum. 2024 Sep 1;95(9). doi: 10.1063/5.0218942.
Due to the increasing demands for active plasma control operations, in situ diagnostics are highly sought after. Tungsten plasma-facing components have been utilized in the Korea Superconducting Tokamak Advanced Research (KSTAR) lower divertor since the 2023 campaign. Plasma radiation is a key parameter for plasma control, especially in radiation front control experiments. Therefore, the KSTAR infra-red video bolometer (IRVB) needs to be reconfigured into an in situ data streaming diagnostic. This requires comprehensive changes in both infra-red camera control and data analysis compared to the previous system. To ensure the stability of the reconfigured system, functional parts are grouped and separated into individual processes to protect camera acquisitions from errors in other processes. In addition, to enhance the speed of data streaming analysis, the analysis code has been optimized and converted into graphics processing unit (GPU) code. Besides the data streaming analysis, the system is also designed to support post-shot analysis with the entire frame data for the same shot to address frame drop issues encountered during data streaming. Radiation front control experiments with N2 gas seeding are successful results of the data streaming IRVB for its commissioning. This paper focuses on the development of the data streaming IRVB system.
由于对有源等离子体控制操作的需求不断增加，原位诊断备受青睐。自2023年运行以来，钨面向等离子体部件已被用于韩国超导托卡马克先进研究装置（KSTAR）的下部偏滤器。等离子体辐射是等离子体控制的关键参数，尤其是在辐射前沿控制实验中。因此，KSTAR红外视频测辐射热计（IRVB）需要重新配置为原位数据流诊断设备。与之前的系统相比，这需要在红外相机控制和数据分析方面进行全面变革。为确保重新配置系统的稳定性，将功能部件分组并分离为单独的进程，以保护相机采集不受其他进程错误的影响。此外，为提高数据流分析速度，对分析代码进行了优化并转换为图形处理单元（GPU）代码。除了数据流分析外，该系统还设计用于支持使用同一次拍摄的全帧数据进行拍摄后分析，以解决数据流过程中遇到的帧丢失问题。使用N2气体注入的辐射前沿控制实验是数据流IRVB调试的成功成果。本文重点介绍了数据流IRVB系统的开发。
