Estimation of Neutral Density in Edge Plasma with Double Null Configuration in EAST

In this work, population coefficients of hydrogen＇s n = 3 excited state from the hydrogen collisional-radiative （CR） model, from the data file of DEGAS 2, are used to calculate the photon emissivity coefficients （PECs） of hydrogen Balmer-α （n = 3 →n = 2） （Hα）. The results are compared with the PECs...

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Published inPlasma science & technology Vol. 13; no. 4; pp. 431 - 434
Main Author 张凌 徐国盛 丁斯晔 高伟 吴振伟 陈颖杰 黄娟 刘晓菊 臧庆 常加峰 张炜 李颖颖 钱金平
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.08.2011
Subjects
中性
光电二极管阵列
密度估计
密度计算
数据文件
结构分析系统
边缘等离子体
配置
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ISSN1009-0630
DOI10.1088/1009-0630/13/4/09

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Summary:In this work, population coefficients of hydrogen＇s n = 3 excited state from the hydrogen collisional-radiative （CR） model, from the data file of DEGAS 2, are used to calculate the photon emissivity coefficients （PECs） of hydrogen Balmer-α （n = 3 →n = 2） （Hα）. The results are compared with the PECs from Atomic Data and Analysis Structure （ADAS） database, and a good agreement is found. A magnetic surface-averaged neutral density profile of typical double-null （DN） plasma in EAST is obtained by using FRANTIC, the 1.5-D fluid transport code. It is found that the sum of integral Dα and Hα emission intensity calculated via the neutral density agrees with the measured results obtained by using the absolutely calibrated multi-channel poloidal photodiode array systems viewing the lower divertor at the last closed flux surface （LCFS）. It is revealed that the typical magnetic surface-averaged neutral density at LCFS is about 3.5×10^16 m^-3 .
Bibliography:neutral density, photon emissivity coefficients, collisional-radiative （CR） model, edge plasma
34-1187/TL
In this work, population coefficients of hydrogen＇s n = 3 excited state from the hydrogen collisional-radiative （CR） model, from the data file of DEGAS 2, are used to calculate the photon emissivity coefficients （PECs） of hydrogen Balmer-α （n = 3 →n = 2） （Hα）. The results are compared with the PECs from Atomic Data and Analysis Structure （ADAS） database, and a good agreement is found. A magnetic surface-averaged neutral density profile of typical double-null （DN） plasma in EAST is obtained by using FRANTIC, the 1.5-D fluid transport code. It is found that the sum of integral Dα and Hα emission intensity calculated via the neutral density agrees with the measured results obtained by using the absolutely calibrated multi-channel poloidal photodiode array systems viewing the lower divertor at the last closed flux surface （LCFS）. It is revealed that the typical magnetic surface-averaged neutral density at LCFS is about 3.5×10^16 m^-3 .
ZHANG Ling , XU Guosheng , DING Siye, GAO Wei , WU Zhenwei, CHEN Yingjie , HUANG Juan , LIU Xiaoju , ZANG Qing , CHANG Jiafeng , ZHANG Wei , LI Yingying , QIAN Jinping （Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China）
ISSN:1009-0630
DOI:10.1088/1009-0630/13/4/09