Potential measurements with heavy ion beam probe system on LHD.
Potential measurements with heavy ion beam probe system on LHD.
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DOI：
10.1063/1.3491317
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
A. Shimizu;T. Ido;S. Nakamura;K. Toi;M. Nishiura;S. Kato
中科院分区：
文献类型：
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作者：
A. Shimizu;T. Ido;S. Nakamura;K. Toi;M. Nishiura;S. Kato
对大螺旋装置（LHD）中的重离子束探针系统进行了如下改进。首先，额外的新扫描器被安装到诊断端口，以扩展可观察区域。在磁位形外移的情况下，利用该扫掠器在比以往实验更宽的小半径范围内测量了磁位形。然后，安装了真实的实时控制系统来控制探测束轨道，以测量大等离子体电流下等离子体中的电势。该系统采用数字信号处理器对探测光束进行真实的实时控制。系统在定点观测模式下工作良好。在扫描模式下的轮廓测量，该控制系统变得不稳定。本文报道了该系统的详细结构和实验结果。
The heavy ion beam probe system in the Large Helical Device (LHD) was improved as follows. At first, the additional new sweeper was installed into the diagnostic port to extend the observable region. By using this sweeper, the potential profile was measured in a wider minor radius range than in previous experiments, in the case of outward shifted magnetic configuration of LHD. Next, the real time control system was installed to control the probe beam orbit for measuring the potential in plasma with large plasma current. In this system, a digital signal processor was used to control the probe beam in real time. The system worked well in the fixed position observation mode. In the sweeping mode for profile measurement, this control system became unstable. The details of this system and the experimental results are reported in this article.