Spatial resolution of the JET Thomson scattering system
Spatial resolution of the JET Thomson scattering system
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DOI：
10.1063/1.3673467
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发表时间：
2012-01-01
影响因子：
1.6
通讯作者：
Walsh, M.
中科院分区：
文献类型：
--
作者：
Frassinetti, L.;Beurskens, M. N. A.;Walsh, M.
计算了欧洲联合环星(JET)中高分辨率汤姆逊散射(HRTS)诊断的仪器功能，用于改进的基座轮廓分析。对于原始的HRTS系统结构，空间仪器响应的半高全宽(FWHM)为(22+/-1)mm，这取决于喷流等离子体的特殊磁拓扑结构。对激光输入系统的光学设计进行了改进。在这种设计中，减少了磁通面的空间涂抹。新的输入系统已投入使用(自2009年7月日圆78742起)，与新配置相对应的高分辨率测量仪器功能已改进至约半高宽=(9.8+/-0.8)毫米。重建的仪器核与用于基座分析的特别正向反卷积过程相结合使用。这一过程对新旧设置都有很好的效果，但当底座宽度与仪器内核的半高宽相同或小于仪器内核的半高宽时，去卷积轮廓的可靠性会大大降低。[DOI：10.1063/1.3673467]
The instrument function of the high resolution Thomson scattering (HRTS) diagnostic in the Joint European Torus (JET) has been calculated for use in improved pedestal profile analysis. The full width at half maximum (FWHM) of the spatial instrument response is (22 +/- 1) mm for the original HRTS system configuration and depends on the particular magnetic topology of the JET plasmas. An improvement to the optical design of the laser input system is presented. The spatial smearing across magnetic flux surfaces is reduced in this design. The new input system has been implemented (from JPN 78742, July 2009) and the HRTS instrument function corresponding to the new configuration has been improved to approximately FWHM = (9.8 +/- 0.8) mm. The reconstructed instrument kernels are used in combination with an ad hoc forward deconvolution procedure for pedestal analysis. This procedure produces good results for both the old and new setups, but the reliability of the deconvolved profiles is greatly reduced when the pedestal width is of the same order as, or less than the FWHM of the instrument kernel. [doi:10.1063/1.3673467]