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

ZHANG Ling; XU Guosheng; DING Siye; GAO Wei; WU Zhenwei; CHEN Yingjie; HUANG Juan

Plasma Science and Technology > 2011 > 13(4): 431-434.

ZHANG Ling, XU Guosheng, DING Siye, GAO Wei, WU Zhenwei, CHEN Yingjie, HUANG Juan. Estimation of Neutral Density in Edge Plasma with Double Null Configuration in EAST[J]. Plasma Science and Technology, 2011, 13(4): 431-434.

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

Institute of Plasma Physics, Chinese Academy of Science, Hefei 230030, China

Funds: supported by National Natural Science Foundation of China (Nos.11075181, 10605028 and 11075180), also in part by the JSPS-CAS Core-University program in the field of ‘Plasma and Nuclear Fusion’

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Received Date: December 02, 2010

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Abstract

Abstract

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→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 3.5×1016m-3.
- neutral density,
- photon emissivity coefficients,
- collisional-radiative (CR) model,
- edge plasma

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