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

•A high frequency pellet injection system has been completely installed on EAST for ELM control up to now.•A new differential pumping system and pellet transmission lines have been designed according to the actual condition of EAST.•Multiple pellets have been injected into type-I ELMy H-mode plasmas...

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Bibliographic Details
Published in:Fusion engineering and design 2020-04, Vol.153, p.111482, Article 111482
Main Authors: Hou, Jilei, Chen, Yue, Yuan, Xiaolin, Limeng, Manni, Sun, Zhen, Zuo, Guizhong, Hu, Jiansheng
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Deuterium
EAST
ELM trigger
Experimental test
Extrusion
High frequencies
High frequency pellet injection system
Internal energy
Pellets
Plasma
Tokamak devices
Transmission lines
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Summary:•A high frequency pellet injection system has been completely installed on EAST for ELM control up to now.•A new differential pumping system and pellet transmission lines have been designed according to the actual condition of EAST.•Multiple pellets have been injected into type-I ELMy H-mode plasmas on EAST for the first time. 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. 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.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2020.111482