Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4921155 | Fusion Engineering and Design | 2017 | 7 Pages |
Abstract
A 50 Hz pellet injection system, which is designed for edge-localized mode (ELM) control, has been successfully developed and integrated for the Experimental Advanced Superconducting Tokamak (EAST). Pellet injection is achieved by two separated injection system modules that can be operated independently from 1 to 25 Hz. The nominal injection velocity is 250 m/s with a scatter of ±50 m/s at a repetition rate of 50 Hz. A buffer tank and a two-stage differential pumping system of the pellet injection system was designed to increase hydrogen/deuterium ice quality and eliminate the influence of propellant gas on plasma operation, respectively. The pressure of the buffer tank could be pumped to 1 Ã 102 Pa, and the pressure in the second differential chamber could reach 1 Ã 10â4 Pa during the experiment. Engineering experiments, which consisted of 50 Hz pellet injection and guiding tube mock-up experiments, were also systematically carried out in a laboratory environment and demonstrated that the pellet injection system can reliably inject pellets at a repetitive frequency of 50 Hz.
Keywords
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Energy
Energy Engineering and Power Technology
Authors
Xingjia Yao, Yue Chen, Jiansheng Hu, Igor Vinyar, Alexander Lukin, Xiaoling Yuan, Changzheng Li, Haiqing Liu,