一个新的多普勒逆向散射 (DBS) 系统,可以同时测量射频等离子体波动和低频流
S Chowdhury1, N A Crocker1, W A Peebles1
1Physics and Astronomy Department, University of California Los Angeles, Los Angeles, California 90098, USA.
The Review of scientific instruments
|July 26, 2023
概括
一个新的多普勒反射系统测量了高达500MHz的等离子体流和射频波. 这种先进的系统通过提供高频现象的详细测量来增强用于核聚变能源研究的等离子体诊断.
科学领域:
- 等离子体物理学的物理学
- 融合能源研究 融合能源研究
- 诊断技术 诊断技术
背景情况:
- 多普勒逆向散射 (DBS) 是测量等离子体密度波动和速度的关键诊断工具.
- 现有的DBS系统在探测高频等离子体现象的能力上往往是有限的.
- 了解高频波和流对于控制和优化聚变等离子体至关重要.
研究的目的:
- 开发和优化一个新的正方形多普勒反射散射 (DBS) 系统用于E频段频率 (60-90 GHz).
- 扩大DBS的功能,同时测量低频流和高频射频等离子体密度波动.
- 为了证明系统在检测离子循环电子波和外部驱动的直升机波方面的性能.
主要方法:
- 开发和优化了一个在E频段 (60-90 GHz) 运行的正方形DBS系统,具有O模式或X模式的极化.
- 使用可调频下调转换系统来检测高频波动 (20-500 MHz).
- 在DIII-D托卡马克中进行局部内部血测量.
主要成果:
- 成功证明了高频波动的检测,包括离子循环电子波 (例如,2fci ~ 23 MHz) 和直子波 (f = 476 MHz).
- 该系统具有低相位噪声,次毫秒时间分辨率和广泛的波数覆盖 (kθ ~ 1-20 cm−1,kr 30 cm−1).
- 介绍了局部测量流 (f ≤ 5MHz),阿尔弗维尼波 (f ~ 6.5MHz),离子旋流波 (f ≥ 20MHz) 和476MHz的直子驱动波动的局部测量.
结论:
- 新的DBS系统显著扩大了DBS的应用到高频谱域.
- 这种进步保持了测量等离子体流和流动的基本能力.
- 未来的工作将涉及使用直子测量来验证DIII-D上的当前驱动应用程序的建模工具.
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