Modeling active control of resistive wall mode with power saturation and sensor noise on HL-2M
| العنوان: | Modeling active control of resistive wall mode with power saturation and sensor noise on HL-2M |
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| المؤلفون: | Shuo Wang, Neng Zhang, B. Li, Guoliang Xia, X. Bai, G.Q. Dong, Yueqiang Liu, Lin Li, Guangzhou Hao, X. M. Song, G. Y. Zheng |
| المصدر: | Plasma Physics and Controlled Fusion. 63:055019 |
| بيانات النشر: | IOP Publishing, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Physics, Resistive touchscreen, Nuclear Energy and Engineering, business.industry, Mode (statistics), Optoelectronics, Condensed Matter Physics, business, Saturation (chemistry), Active control, Noise (electronics), Power (physics) |
| الوصف: | The resistive wall mode (RWM) control on the HL-2M tokamak is simulated with the MARS-F code (Liu et al 2000 Phys. Plasmas 7 3681), aiming at quantifying control current and voltage requirements when more realistic issues are taken into account, i.e. the control power saturation and the sensor signal noise. The fluid model predicts a narrow stability region for the n = 1 RWM without magnetic feedback, in the 2D parameter space of the plasma pressure versus the toroidal flow speed. Magnetic feedback can fully stabilize the RWM on HL-2M. Without considering the voltage limitation and the sensor signal noise, it is found that plasma flow helps active control of the mode, by reducing the required critical feedback gain for both flux-to-current and flux-to-voltage control schemes. In the absence of the sensor signal noise, the lowest control voltage saturation level, below which the RWM control is lost, is found to roughly satisfy a linear relation to the plasma flow frequency, indicating that subsonic plasma flow is effective in relaxing the control power requirement for the RWM feedback stabilization. The presence of the sensor signal noise substantially modifies the feedback results. A statistical study finds that the sensor signal noise, with the standard deviation of 0.1 G on HL-2M, roughly doubles the required control voltage for successful mode control. The synergistic stabilization effect due to plasma flow is somewhat weakened by the presence of the sensor signal noise. At a given rotation, the tolerable voltage limit generally increases with increasing feedback gain due to the sensor signal noise. |
| تدمد: | 1361-6587 0741-3335 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::1f7d1f13aadc0476f3ba22fd48f51477 https://doi.org/10.1088/1361-6587/abf315 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........1f7d1f13aadc0476f3ba22fd48f51477 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13616587 07413335 |
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