Validation of 2D Te and ne measurements made with Helium imaging spectroscopy in the volume of the TCV divertor-猫眼课题宝

DOI：

10.1088/1741-4326/acb5b0

发表时间：

2023-01

期刊：

Nuclear Fusion

影响因子：

3.3

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

B. Linehan;A. Perek;B. P. Duval;F. Bagnato;Patrick Blanchard;C. Colandrea;Hugo de Oliveira;O. Février;E. Flom;S. Gorno;Motoshi Goto;E. Marmar;Lorenzo Martinelli;Abhilash Mathews;Jorge Manuel Munoz Burgos;D. Mykytchuk;N. Offeddu;Diego Sales de Oliveira;H. Reimerdes;Detlev Reiter;O. Schmitz;J. L. Terry;C. Theiler;C. Tsui;Benjamin Vincent;T. Wijkamp;C. Wüthrich;W. Zholobenko

氦原子发射多光谱成像 (HeMSI) 已用于在 TCV 偏滤器中创建 Te 和 ne 的 2D 极向图。为了实现这些测量，TCV 的 MANTIS 多光谱相机（Perek 等人 2019 Rev. Sci. Instrum. 90 123514）同时对被动存在的 He 和 He+ 的 4 条 He I 线（两条单线态和两条三线态）和一条 He II 线（468 nm）进行成像。这些图像经过绝对校准并覆盖整个偏滤器区域，通过环形对称的假设进行反转，以创建发射率分布图，从而创建线比分布图。将碰撞辐射模型 (CRM) 应用于线比剖面以生成 Te 和 ne 的二维极向图。碰撞辐射建模是使用 Goto 氦 CRM 代码（Zholobenko et al 2018 Nucl. Fusion 58 126006、Zholobenko et al 2018 Technical Report、Goto 2003 J. Quant. Spectrosc. Radiat. Transfer 76 331–44）完成的，该代码解释了电子碰撞激发 (EIE) 和去激发以及电子-离子与 He+ 的重组 (EIR)。 HeMSI Te 和 ne 测量结果与共局汤姆森散射测量结果进行了比较。两组测量结果对于电离等离子体表现出良好的一致性：在大多数氦等离子体的情况下（5eV⩽Te⩽60eV 和 2×1018m−3⩽ne⩽3×1019m−3），在大多数氦等离子体的情况下（10eV⩽Te⩽40eV，2×1018m−3⩽ne⩽3×1019m−3）大多数氘等离子体。然而，在某些情况下，HeMSI 测量结果与汤姆森散射不同。当大多数氘等离子体中 Te⩽10eV 时，HeMSI 推断出的 Te 值不准确。这种分歧无法在 CRM 的 EIE 和 EIR 框架内纠正。其次，在私人通量区域内的零星情况下，HeMSI 会错误地产生较高的 ne 测量值。氦发射的多光谱成像已被证明可以在托卡马克偏滤器内生成准确的 Te 和 ne 二维极向图，用于与当代偏滤器研究相关的等离子体条件。

Multi-spectral imaging of helium atomic emission (HeMSI) has been used to create 2D poloidal maps of Te and ne in TCV’s divertor. To achieve these measurements, TCV’s MANTIS multispectral cameras (Perek et al 2019 Rev. Sci. Instrum. 90 123514) simultaneously imaged four He I lines (two singlet and two triplet) and a He II line (468 nm) from passively present He and He+. The images, which were absolutely calibrated and covered the whole divertor region, were inverted through the assumption of toroidal symmetry to create emissivity profiles and, consequently, line-ratio profiles. A collisional-radiative model (CRM) was applied to the line-ratio profiles to produce 2D poloidal maps of Te and ne . The collisional-radiative modeling was accomplished with the Goto helium CRM code (Zholobenko et al 2018 Nucl. Fusion 58 126006, Zholobenko et al 2018 Technical Report, Goto 2003 J. Quant. Spectrosc. Radiat. Transfer 76 331–44) which accounts for electron-impact excitation (EIE) and deexcitation, and electron–ion recombination (EIR) with He+ . The HeMSI Te and ne measurements were compared with co-local Thomson scattering measurements. The two sets of measurements exhibited good agreement for ionizing plasmas: (5eV⩽Te⩽60eV , and 2×1018m−3⩽ne⩽3×1019m−3) in the case of majority helium plasmas, and (10eV⩽Te⩽40eV,2×1018m−3⩽ne⩽3×1019m−3) in the case of majority deuterium plasmas. However, there were instances where HeMSI measurements diverged from Thomson scattering. When Te⩽10eV in majority deuterium plasmas, HeMSI deduced inaccurately high values of Te . This disagreement cannot be rectified within the CRM’s EIE and EIR framework. Second, on sporadic occasions within the private flux region, HeMSI produced erroneously high measurements of ne . Multi-spectral imaging of Helium emission has been demonstrated to produce accurate 2D poloidal maps of Te and ne within the divertor of a tokamak for plasma conditions relevant to contemporary divertor studies.

Validation of 2D Te and ne measurements made with Helium imaging spectroscopy in the volume of the TCV divertor

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