Evaluation of tungsten influx rate and study of edge tungsten behavior based on the observation of EUV line emissions from W6+ ions in HL-2A
Evaluation of tungsten influx rate and study of edge tungsten behavior based on the observation of EUV line emissions from W6+ ions in HL-2A
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基于 HL-2A 中 W6 离子 EUV 线发射的观察，评估钨流入速率并研究边缘钨行为
DOI：
10.1088/1741-4326/aaf084
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发表时间：
2018-12
期刊：
影响因子：
3.3
通讯作者：
董春凤
中科院分区：
文献类型：
--
作者：
董春凤
在HL-2A托卡马克装置上研究了极紫外（EUV）波段的钨光谱，以寻找低电离态钨离子的线发射，并用于等离子体边缘钨输运的研究。为此目的，钨注入HL-2A等离子体中使用激光吹离（LBO）技术与新开发的双层钨靶。通过调节从聚焦透镜到钨靶的距离，可以精确地控制注入的钨颗粒的总数。一个准连续光谱称为未分辨跃迁阵列（UTA），由钨离子的几个电离阶段的许多线发射组成，在50 μ m左右观察到作为钨光谱的典型指示。在HL-2A实验中，钨的准连续谱主要由W ~（14）~ W ~（23）离子的线发射组成。通过对观测到的钨谱的分析，首次在托卡马克装置上成功地识别出了W ~（6+）离子的两条孤立谱线W_VII（5 p-5d：216.219）和W_VII（5 p-5d：261.387）。在本实验中确定的两条谱线的强度比和波长显示出很好的一致性与强度比计算的碰撞辐射模型开发的W 6+离子和以前的结果由糖和考夫曼（1975年物理修订A 12 994），分别。另一方面，W VII线发射偶尔会在LBO注入后重新出现，这表明沉积在偏滤器板上的钨重新进入，并且在放电期间撞击点移动到偏滤器板的某个区域，在该区域沉积钨。基于钨离子再入大气层时观测到的W VII发射，利用ADAS程序计算的逆光子效率和平均配置选项，对W 6+离子向边缘等离子体的注入进行了评估。结果发现，通常在（0.1-2.0）× 1013 cm−2 s−1范围内。对本研究中评价的流入量也作了简要的讨论。
The tungsten spectrum in the extreme ultraviolet (EUV) wavelength range has been investigated in tokamak HL-2A to find line emissions from low-ionized tungsten ions which can be used for tungsten transport study in the plasma edge. For this purpose, tungsten is injected in the HL-2A plasma using the laser blow-off (LBO) technique with a newly developed double-layer tungsten target. The total number of injected tungsten particles can be accurately controlled by adjusting the distance from the focal lens to the tungsten target. A quasi-continuum spectrum called an unresolved transition array (UTA), consisting of many line emissions from several ionization stages of tungsten ions, is observed at around 50 Å as a typical indication of the tungsten spectrum. In the present HL-2A experiment the quasi-continuum of tungsten is mainly composed of line emissions from W14+ to W23+ ions. Analyzing the observed tungsten spectrum, two isolated line emissions of W VII (5p–5d: 216.219 Å) and W VII (5p–5d: 261.387 Å) from W6+ ions are successfully identified for the first time in tokamaks. The intensity ratio and the wavelengths of the two lines determined in the present experiment show good agreement with the intensity ratio calculated with a collisional-radiative model developed for the W6+ ion and a previous result by Sugar and Kaufman (1975 Phys. Rev. A 12 994), respectively. On the other hand, the W VII line emission occasionally reappears after the LBO injection, suggesting a re-entry of the tungsten deposited onto divertor plates and a movement of the strike point during the discharge to a certain area of the divertor plate where tungsten is deposited. Based on the W VII emission observed during the re-entry event of tungsten ions, an influx of the W6+ ion, , to the edge plasma is evaluated using the inverse photon efficiency calculated with the ADAS code and using an average-configuration option. As a result, it is found that is typically within the range (0.1–2.0) × 1013 cm−2 s−1. A brief discussion is also made on the influx evaluated in the present study.
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影响因子：
1.9
作者：
T. Harada;T. Kita
通讯作者：
T. Harada;T. Kita
HL-2A实验结果概述
影响因子：
3.3
作者：
Ding, X.T.;Wang, S.J.;Dong, J.Q.;Duan, X.R.;Liu, D.Q.;Xuan, W.M.;Chen, L.Y.;Song, X.M.;Zhou, C.P.;Chen, W.;Zhang, J.H.;Bu, M.N.;Yan, L.W.;Rao, J.;et al.;Li, X.D.;Liu, Yong;Mao, W.C.;Chen, Y.H.;Yang, Q.W.;Cui, C. H.;Cao, Z.;Gao, Q. D.
通讯作者：
Gao, Q. D.
影响因子：
3.1
作者：
A. Pospieszczyk;T. Tanabe;V. Philipps;G. Sergienko;T. Ohgo;K. Kondo;M. Wada;M. Rubel;W. Biel;A. Huber;A. Kirschner;J. Rapp;N. Noda
通讯作者：
A. Pospieszczyk;T. Tanabe;V. Philipps;G. Sergienko;T. Ohgo;K. Kondo;M. Wada;M. Rubel;W. Biel;A. Huber;A. Kirschner;J. Rapp;N. Noda
DOI：
10.1063/1.4891708
发表时间：
2014-08
期刊：
The Review of scientific instruments
影响因子：
--
作者：
Z. Cui;C. Dong;Hangyu Zhou;S. Morita;P. Sun;B. Fu;P. Lu;X. Ding;Qingwei Yang;X. Duan
通讯作者：
Z. Cui;C. Dong;Hangyu Zhou;S. Morita;P. Sun;B. Fu;P. Lu;X. Ding;Qingwei Yang;X. Duan
DOI：
10.1088/0953-4075/38/16/017
发表时间：
2005-08
期刊：
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子：
--
作者：
T. Pütterich;R. Neu;C. Biedermann;R. Radtke
通讯作者：
T. Pütterich;R. Neu;C. Biedermann;R. Radtke