Modification of plasma control system and hot-wall temperature control system for long-duration plasma sustainment in QUEST

Modification of plasma control system and hot-wall temperature control system for long-duration plasma sustainment in QUEST
复制标题

修改等离子体控制系统和热壁温度控制系统，以实现 QUEST 中长时间等离子体维持

DOI：
10.1016/j.fusengdes.2018.02.069
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发表时间：
2018
期刊：
Fusion Engineering and Design
影响因子：
1.7
通讯作者：
Nagata Takahiro
Nagata Takahiro
中科院分区：
工程技术3区
文献类型：
--
作者：
Hasegawa Makoto;Nakamura Kazuo;Hanada Kazuaki;Kawasaki Shoji;Kuzmin Arseniy;Idei Hiroshi;Tokunaga Kazutoshi;Nagashima Yoshihiko;Onchi Takumi;Kuroda Kengoh;Watanabe Osamu;Higashijima Aki;Nagata Takahiro

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在托卡马克中，面向等离子体的壁的温度是实现粒子平衡以及稳态操作的重要参数。 QUEST 是一个中型球形托卡马克装置，其热壁可充当面向等离子体的壁。它们可以用护套加热器主动加热并用水主动冷却。为了控制壁温，已经开发了加热和冷却系统。这些系统分别调节冷却系统的护套加热器和电动阀的功率。两个系统通过UDP通过以太网进行通信，协同控制热壁温度。 QUEST 中的等离子体控制系统 (PCS) 也进行了修改，特别是在气体燃料方面，以实现长时间的等离子体维持。 PCS 中安装了反馈控制器和质量流量控制器，可以很好地控制用作参考信号的等离子体中的 Hα 发射。为反馈控制系统提出了使用现场可编程门阵列的等离子体密度计算。
In tokamaks, the temperature of the plasma-facing wall is an important parameter for achieving particle balance and therefore steady-state operation. QUEST, which is a middle-sized spherical tokamak, has hot walls that act as plasma-facing walls. They can be actively heated with sheath heaters and actively cooled with water. To control the wall temperature, heating and cooling systems have been developed. These systems adjust the power of the sheath heaters and the motor valves of the cooling system, respectively. The two systems communicate via Ethernet through UDP and control the hot-wall temperature cooperatively. The plasma control system (PCS) in QUEST has also been modified, especially with respect to gas fueling, in order to enable long-duration plasma sustainment. A feedback controller has been installed in the PCS, together with a mass flow controller, allowing Hα emission from the plasma which is used as a reference signal, to be well controlled. Plasma density calculations using a field-programmable gate array are proposed for the feedback control system.
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