X-Mode Frequency Modulated Density Profile Reflectometer on EAST Tokamak
X-Mode Frequency Modulated Density Profile Reflectometer on EAST Tokamak
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EAST 托卡马克上的 X 模式调频密度分布反射仪
DOI：
10.1088/1009-0630/15/9/04
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发表时间：
2013-09
影响因子：
1.7
通讯作者：
Yu Changxuan
中科院分区：
文献类型：
--
作者：
Liu Ahdi;Li Hong;Li Bin;Zhou Chu;Zhang Xiaohui;Hu Jianqiang;Xie Jinlin;Liu W;ong;Yu Changxuan
在EAST上建立了一个超模（x模）调频连续波（FMCW）剖面反射计。在反射计中，通过超突变调谐变容振荡器（HTO）源产生扫频范围为12.5 GHz ~ 18 GHz的连续波，并使用4倍有源倍频器将频率增加到v波段（50 GHz ~ 72 GHz）。喇叭透镜天线的极化方向垂直于边缘等离子体处的磁力线。根据v波段频率范围和极化情况，系统覆盖密度范围为0.5 × 1019m−3 ~ 3.0 × 1019m−3（环向磁场为1.8 T时），时间分辨率为12.5 ~ 50 μs。密度分布可以通过经验方程假设边缘分布来计算。该方法得到的最大空间误差约为4 cm。该反射计已成功应用于2010年秋季EAST运动，获得了低约束模式到高约束模式转换过程中密度分布的时间演变。观测了东托卡马克的密度基础，估计了密度基础的最大值和梯度。
An extraordinary-mode (X-mode) frequency-modulated continuous-wave (FMCW) profile reflectometer has been built on EAST. In the reflectometer, continuous waves with frequency sweeping from 12.5 GHz to 18 GHz were generated through a Hyperabrupt Tuned-varactor Oscillator (HTO) source and a four times active multiplier was used to increase the frequency to V-band (50 GHz to 72 GHz). The polarization of horn lens antenna is perpendicular to the magnetic field line at the edge plasmas. According to the V-band frequency range and polarization, the system cover density range from 0.5 × 1019m−3 to 3.0 × 1019m−3 (when toroidal magnetic field is 1.8 T), with time resolution of 12.5 ~ 50 μs. The density profile could be calculated by assuming the edge profile through an empirical equation. The maximum spatial error deduced by the method is about 4 cm. This reflectometer has been successfully applied in 2010 autumn EAST campaign, the temporal evolution of density profiles was acquired during the low confinement mode to high confinement mode transition. The density pedestal of EAST Tokamak was observed and the top value and gradient of the density pedestal were estimated.
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影响因子：
3.3
作者：
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通讯作者：
P. Varela;M. Manso;A. Silva;the CFN Team;the ASDEX Upgrade Team
影响因子：
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作者：
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影响因子：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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