Construction and experimental tests of the high frequency pellet injection system on EAST tokamak

Journal Article · 18 January 2020 · Fusion Engineering and Design

DOI: https://doi.org/10.1016/j.fusengdes.2020.111482 · OSTI ID:1660495

Hou, Jilei  ^[1]; Chen, Yue ^[2]; Yuan, Xiaolin ^[2]; Limeng, Manni ^[1]; Sun, Zhen ^[3]; Zuo, Guizhong ^[2]; Hu, Jiansheng ^[2]

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1. Chinese Academy of Sciences (CAS), Hefei (China); Univ. of Science and Technology of China, Hefei (China)
2. Chinese Academy of Sciences (CAS), Hefei (China)
3. Chinese Academy of Sciences (CAS), Hefei (China); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

A high frequency deuterium pellet injection system based on extrusion and pneumatic acceleration has been recently developed and built for EAST tokamak, which is one of fully superconducting Tokamaks with ITER-like plasma configuration. It is mainly used for plasma edge localized mode control and can achieve 1-50 Hz injection rate. It has been completely installed on EAST up to now. A new differential pumping system and pellet transmission lines have been designed according to the actual condition of EAST. Recently we have tested the system systematically and injected multiple pellets into type-I ELMy H-mode plasma on EAST for the first time. Here, the test and experimental results show that the system can inject continuous pellets into plasma stably, and ELMs can be triggered by deuterium pellets in H mode plasma with negligible impact on density and stored energy. And it was also found that ELM trigger efficiency is less than 100% sometimes. This lays an important foundation for further experimental study of ELM modulation using deuterium pellet injection on EAST.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: National Key Research and Development Program of China; National Nature Science Foundation of China (NNSFC); Presidential Foundation of Hefei Inst. of Physical Science; USDOE
• OSTI ID: 1660495
• Journal Information: Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Vol. 153; ISSN 0920-3796
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English