Development and research of transport simulation analysis of CxHy series hydrocarbon molecules in the plasma periphery

CxHy系列碳氢化合物分子在等离子体外围输运模拟分析的开发与研究

• 批准号: 18560794
• 负责人: SHOJI Mamoru
• 金额: $ 2.54万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560794/
• 关键词: HydroCarbon; Impurity transport; Peripheral plasma; Divertor; Image measurement; Large Helical Device; 中性粒子輸送シミュレーション; 炭化水素分子; カメラ計測; モンテカルロ法; CCDカメラ

It is very important to clarify the behavior of hydrocarbon molecules in the plasma periphery for aiming at future nuclear fusion reactors. We tried to measure the profile of a visible line emission (CH-band) emitted by hydrocarbon molecules. For this purpose, we installed a CCD camera with an interference filter in an outer port (7-O) in the LHD vacuum vessel in order to observe lower divertor legs in the plasma periphery and plasma-wall interactions on divertor plates installed near a lower port. The viewing angle and exposure time of the camera are fully controlled from the remote side (from the LHD control room). Using the CCD camera, we have succeeded in measuring the emission profile on the lower divertor legs in the plasma periphery and extending the important knowledge for investigating the behavior of hydrocarbon molecules in the peripheral plasma. The movement of the emission area of the CH-band from the downstream side to the upstmam side on the divertor leg was observed dur … More ing the process to radiation collapse by increasing the plasma density due to excessive gas fueling. This phenomenon can give us very important information to investigate the physical mechanism of the transport of the hydrocarbon molecules in the divertor region The investigation can contribute to clarification of the effect of the hydrocarbon molecules to the radiation collapse in LHD plasmas.For detailed analysis of the transport of the hydrocarbon molecules in the divertor region, a three-dimensional neutral particle transport simulation code is an essential tool. We found that the parallel computing of the three-dimensional neutral particle transport simulation code is necessary for detailed analysis of the transport of the hydrocarbon molecules on the divertor legs. Thus, we tried to modify the code for the parallel computing and succeeded in shortening the computation time significantly. The database of the cross-section of the atomic and molecular process of hydrocarbon molecules has been updated. We can expect detailed analysis of the transport of the hydrocarbon molecules by combination of the updated database and the fully parallelized simulation code in the LHD plasma periphery. Less

阐明碳氢化合物分子在等离子体外围的行为对于未来的核聚变反应堆非常重要，我们尝试测量碳氢化合物分子发射的可见线发射（CH 波段）的轮廓。 LHD 真空容器的外端口 (7-O) 中带有干涉滤光片的 CCD 摄像机，用于观察等离子体外围的下偏滤器腿以及安装在下端口附近的偏滤器板上的等离子体壁相互作用。接触时间相机的完全控制从远程端（从 LHD 控制室），我们成功地测量了等离子体外围下偏滤器腿上的发射剖面，并扩展了研究偏滤器行为的重要知识。在通过增加等离子体密度而导致辐射塌陷的过程中，观察到了外围等离子体中碳氢化合物分子的 CH 波段发射区域从下游侧到上侧的移动。这种现象是加油过多。可以为我们研究偏滤器区域中碳氢化合物分子传输的物理机制提供非常重要的信息。该研究有助于阐明碳氢化合物分子对 LHD 等离子体中辐射塌陷的影响。详细分析碳氢化合物分子的传输对于偏滤器区域中的碳氢化合物分子，三维中性粒子输运模拟代码是必不可少的工具，我们发现三维中性粒子输运模拟代码的并行计算对于详细分析碳氢化合物分子的输运是必要的。在偏滤器腿上。我们尝试修改并行计算的代码，并成功地显着缩短了计算时间。碳氢化合物分子的原子和分子过程的横截面数据库已经更新，我们可以期待对碳氢化合物传输的详细分析。分子通过结合更新的数据库和 LHD 等离子体外围设备中的完全并行化模拟代码。

项目成果

Analyses of Visible Images of the Plasma Periphery Observed with Tangentially Viewing CCD Cameras in the Large Helical Device

大型螺旋装置切向观察CCD相机观测等离子体外围可见光图像分析

• 发表时间: 2007
• 作者: Mamoru Shoji

Optimization of a closed divertor configuration for three dimensionally complicated magnetic structure in the LHD plasma periphery

LHD 等离子体外围三维复杂磁结构的封闭偏滤器配置优化

• 发表时间: 2007
• 作者: M. Shoii. M. Kobayashi; S. Masuzaki; A. Iwamae; T. Watanabe; H. Yamada; A. Komori; LHD Experimental Group
• 通讯作者: LHD Experimental Group

Analyses of visible images of the plasma periphery observed with tangentially viewing CCD cameras in the large helical device

大型螺旋装置中切向观察CCD相机观察到的等离子体外围可见图像的分析

• 发表时间: 2006
• 作者: M. Shoii. T. Watanabe; S. Masuzaki; H. Yamada; A. Komori; LHD Experimental Groups
• 通讯作者: LHD Experimental Groups

Optimization of Closed Divertor Configuration for Effective Particle Control in LHD Plasmas

优化封闭式偏滤器配置以有效控制 LHD 等离子体中的颗粒

• 发表时间: 2008
• 作者: Mamoru Shoji

Three-dimensional neutral particle transport simulation for analyzing polarization resolved H-alpha spectra in the large helical device

用于分析大型螺旋装置中偏振分辨 H-α 光谱的三维中性粒子输运模拟

• 发表时间: 2007
• 作者: M. Shoii; A. Iwamae; M. Goto; A. Sakaue; M. Atake; S. Masuzaki; J. Miyazawa; N. Ohyabu; A. Komori; LHD Experimental Groups
• 通讯作者: LHD Experimental Groups