Transport simulations of pre-thermal quench shattered pellet injection in ITER: code verification and assessment of key trends
Transport simulations of pre-thermal quench shattered pellet injection in ITER: code verification and assessment of key trends
复制标题
ITER 中预热淬火破碎颗粒注入的传输模拟：关键趋势的代码验证和评估
DOI：
10.1088/1361-6587/ac89b2
复制
发表时间：
2022-08
影响因子：
2.2
通讯作者：
J. Artola
中科院分区：
文献类型：
--
作者：
A. Matsuyama;D. Hu;Michael Lehnen;Eric Nardon;J. Artola
摘要利用一维输运模拟方法，对ITER中预热猝灭阶段的破碎弹丸注入（SPI）的物质同化进行了数值研究。这种简化的一维方法是有用的关键工程参数进行广泛和系统的研究，以优化ITER中断缓解系统。模拟结果进行了比较，与二维（2D）轴对称模拟的非线性磁流体动力学代码JOREK为5%氖/95%氢SPI在15 MA氢L模式放电，澄清SPI同化的特点，可以分析的范围内的一维模型。合理的协议之间的1D SPI模拟的INDEX代码和2D模拟的JOREK代码被发现的总烧蚀率，辐射功率，密度和温度分布演变。与运输代码研究的关键过程是不稳定的等离子体电流分布的辐射冷锋的发病。广泛扫描氖混合氢SPI的注入参数，以确定辐射冷锋形成的时间尺度。取决于冷锋和SPI碎片的相对速度，等离子体冷却过程可以显著不同。SPI与高注射速度和大的碎片尺寸的结果，即使在一个由内而外的等离子体冷却，导致中空的温度分布在这里报道的模拟。
Abstract The material assimilation of the shattered pellet injection (SPI) in the pre-thermal quench phase in ITER is studied numerically by means of one-dimensional (1D) transport simulations. Such a simplified 1D approach is useful to perform extensive and systematic studies of key engineering parameters to optimize the ITER Disruption Mitigation System. The simulation results are compared with two-dimensional (2D) axisymmetric simulations by the nonlinear magnetohydrodynamic code JOREK for 5 % neon/95 % hydrogen SPI in the 15 MA hydrogen L-mode discharge to clarify the characteristics of SPI assimilation that can be analyzed within the range of the 1D model. Reasonable agreement between the 1D SPI simulation by the INDEX code and the 2D simulations by the JOREK code is found for total ablation rates, the radiation power, and the density and temperature profile evolution. The key process that was studied with the transport code is the onset of the radiative cold front that destabilizes the plasma current profiles. The injection parameters for the neon mixed hydrogen SPI are widely scanned to identify the timescale for the radiative cold front to form. Depending on the relative velocity of the cold front and the SPI fragments, the plasma cooling process can differ significantly. SPI with high injection velocities and large shard sizes results even in an inside-out plasma cooling that leads to hollow temperature profiles in the simulations reported here.
DOI：
10.2172/1344852
发表时间：
2016-06
期刊：
--
影响因子：
--
作者：
P. Parks
通讯作者：
P. Parks
DOI：
--
发表时间：
2020
期刊：
--
影响因子：
--
作者：
M. Choi;Jayhyun Kim;J. Kwon;Jaehyun Lee;Minwoo Kim;Minho Kim;Gunsu;Yun;Y. In;Hyeon K. Park;B. Park;R. Sweeney
通讯作者：
M. Choi;Jayhyun Kim;J. Kwon;Jaehyun Lee;Minwoo Kim;Minho Kim;Gunsu;Yun;Y. In;Hyeon K. Park;B. Park;R. Sweeney