First Results of Pellet Injection Experiments on EAST

A new pellet injection system was installed on the EAST tokamak and preliminary experiments were performed during the 2012 run campaign. Typical phenomena associated with deuterium pellet injection into a plasma discharge have been observed including sudden increases of the electron density and Hα/D...

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Published inPlasma science & technology Vol. 16; no. 10; pp. 913 - 918
Main Author 李长征 胡建生 陈跃 梁云峰 李建刚 李加宏 吴金华 韩翔
Format Journal Article
LanguageEnglish
Published 01.10.2014
Subjects
Deuterium
EAST
Electron density
Elm
Fuelling
H模式等离子体
Injectors
Pellets
Scanning
Tokamak devices
实验
弹丸注入系统
托卡马克
注射速度
等离子体放电
等离子体柱
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Summary:A new pellet injection system was installed on the EAST tokamak and preliminary experiments were performed during the 2012 run campaign. Typical phenomena associated with deuterium pellet injection into a plasma discharge have been observed including sudden increases of the electron density and Hα/Da emission intensity as well as a significant decrease in plasma electron temperature. Profiles have been studied in order to understand the influence of pellet fuelling on EAST discharges. Even though the injector was specifically designed for plasma fu- elling, ELM triggering using the pellet injection has also been tested. In order to find appropriate parameters for triggering ELMs in H-mode plasmas, scanning of the pellet injection speed was employed for pellets injected from both the high field side and low field side of the plasma column. It has been observed that low-speed pellets injected into H-mode plasma from the low-field side could trigger an ELM followed by a number of smaller induced ELMs at about 300 Hz.
Bibliography:pellet injection, ELM trigger, EAST
34-1187/TL
A new pellet injection system was installed on the EAST tokamak and preliminary experiments were performed during the 2012 run campaign. Typical phenomena associated with deuterium pellet injection into a plasma discharge have been observed including sudden increases of the electron density and Hα/Da emission intensity as well as a significant decrease in plasma electron temperature. Profiles have been studied in order to understand the influence of pellet fuelling on EAST discharges. Even though the injector was specifically designed for plasma fu- elling, ELM triggering using the pellet injection has also been tested. In order to find appropriate parameters for triggering ELMs in H-mode plasmas, scanning of the pellet injection speed was employed for pellets injected from both the high field side and low field side of the plasma column. It has been observed that low-speed pellets injected into H-mode plasma from the low-field side could trigger an ELM followed by a number of smaller induced ELMs at about 300 Hz.
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ISSN:1009-0630
DOI:10.1088/1009-0630/16/10/03