2026-09-30 合肥物質科学研究院（HFIPS）
The contribution of the lower-Z impurity poloidal asymmetry effect on the Tungsten neoclassical transport. (Image by PAN Chengkang)
＜関連情報＞
- https://english.hf.cas.cn/nr/rn/202609/t20260930_1201620.html
- https://iopscience.iop.org/article/10.1088/1741-4326/ae9ab0
- https://iopscience.iop.org/article/10.1088/1741-4326/ad5218
- https://iopscience.iop.org/article/10.1088/1741-4326/acbc36
トカマクプラズマにおける低原子番号不純物の共存によるタングステン新古典粒子輸送特性の変化 Change of the Tungsten neoclassical particle transport characteristic due to the coexisting of the lower-Z impurity in the tokamak plasmas
Chengkang Pan
Nuclear Fusion Published: 4 September 2026
DOI:10.1088/1741-4326/ae9ab0
Abstract
The high-Z impurity Tungsten neoclassical particle transport in the tokamak plasmas with the coexisting of the lower-Z impurity is investigated. The lower-Z impurity could reduce or enhance the Tungsten neoclassical particle transport. The Tungsten neoclassical transport characteristic will be changed with the lower-Z impurity content large enough. The dependence of the Tungsten neoclassical transport on the bulk ion radial gradients predicted by the existing impurity neoclassical transport theory will be broken. The existing impurity transport theory will over-predict (under-predict) the Tungsten neoclassical particle transport for the bulk ion radial gradients less (larger) than the critical value. The effect of the lower-Z impurity on the high-Z impurity neoclassical transport is through the parallel friction force coupling and it should be included in the Tungsten neoclassical particle transport calculation.
単一ヌルダイバータ構成によるトカマクプラズマにおける高Z不純物の新古典輸送 High-Z impurity neoclassical transport in the tokamak plasmas due to the single-null divertor configuration
Chengkang Pan
Nuclear Fusion Published: 11 June 2024
DOI:10.1088/1741-4326/ad5218
Abstract
A new mechanism for the high-Z impurity neoclassical particle transport in the tokamak plasmas due to the single-null divertor configuration is discovered for the first time. It will play an important role in the tokamak plasma pedestal region with the coexisting of the strong bulk ion radial gradients and the up/down asymmetry of the poloidal magnetic field. The outward (inward) high-Z impurity neoclassical particle transport will be driven with the B×▽B drift towards (away from) the X-point. The new finding indicates that the International Thermonuclear Experimental Reactor lower single-null divertor configuration will be beneficial for screening and flushing out the high-Z impurity in the pedestal region with the toroidal magnetic field in the normal direction (B×▽B drift towards the X-point).
トカマクプラズマにおけるプラズマ伸長による新古典的不純物密度上下非対称性とPfirsch–Schlüter輸送の増強 Enhancement of neoclassical impurity density up/down asymmetry and Pfirsch–Schlüter transport due to the plasma elongation in the tokamak plasmas
Chengkang Pan
Nuclear Fusion Published: 8 March 2023
DOI:10.1088/1741-4326/acbc36
Abstract
The standard neoclassical theory of the impurity transport in tokamak plasma is improved by including the plasma elongation effect. The neoclassical up/down asymmetry of the impurity density is largely enhanced by the plasma elongation and is under-predicted by the neoclassical theory with the circular cross section assumption. Accordingly, the impurity Pfirsch–Schlüter neoclassical transport is also enhanced by the plasma elongation.
