The vacuum vessel electromagnetic load of high magnetic field compact tokamak during plasma vertical displacement event

doi:10.16568/j.0254-6086.202504005

Abstract

Abstract: The high magnetic field compact tokamak (HFCT) has the advantages of small size, strong magnetic field, and high fusion gain. However, due to the strong current of plasma and external field coil in HFCT,the plasma current reduces rapidly during discharge disruption, resulting in the increase of electromagnetic load of vacuum vessel. This paper refers to SPARC Tokamak physics and engineering design, uses the TSC (Tokamak Simulation Code) program to simulate the discharge in the vertical displacement event (VDE) of HFCT, and the external coil current and plasma current simulated by TSC were imported into the three-dimensional ANSYS model of HFCT, and then electromagnetic load was analyzed based on the finite element model. The maximum magnetic field of HFCT vacuum vessel is 20.5 T, the maximum eddy current of the vacuum vessel module is 349MA·m⁻², the maximum electromagnetic force of the node is 54.231 kN, and the maximum first stress is 673 MPa,which is less than the allowable stress (800 MPa) of Inconel718 material. The engineering design meets the physical requirements. The analysis results can provide reference for the physical and engineering design of high magnetic field compact tokamak.

Key words: HFCT, TSC, Vacuum vessel, Vertical displacement event, Electromagnetic load

摘要：

强磁场紧凑型托卡马克(HFCT)具有尺寸小、磁场强、聚变增益高等优点，然而 HFCT 等离子体电流和外场线圈电流较大，在放电破裂期间等离子体电流快速溃灭，导致真空室电磁载荷增大。参照 SPARC 托卡马克装置物理和工程设计，利用 TSC 程序对 HFCT 垂直位移事件(VDE)中进行放电模拟，并将 TSC 中外部线圈电流、等离子体电流等源项导入到HFCT 的 ANSYS 三维模型中，基于有限元模型进行电磁载荷分析。HFCT 真空室最大磁场为 20.5 T，真空室模块最大涡流为 349 MA·m⁻²；节点最大电磁力为54.231kN；最大第一应力为 673 MPa，小于 Inconel718 材料许用应力 800 MPa，工程设计满足物理需求，分析结果可为强磁场紧凑型托卡马克装置的物理和工程设计提供参考。

关键词: 强磁场紧凑型托卡马克, TSC, 真空室, 垂直位移事件, 电磁载荷

CLC Number:

TL62+2

CHEN Kai-jie, YANG Jin-hong, XI Xu-yao, WANG Wei-hua. The vacuum vessel electromagnetic load of high magnetic field compact tokamak during plasma vertical displacement event[J]. Nuclear Fusion and Plasma Physics, 2025, 45(4): 404-410.

陈凯杰, 杨锦宏, 席绪尧, 汪卫华. 强磁场紧凑型托卡马克垂直位移放电模拟与真空室电磁载荷分析[J]. 核聚变与等离子体物理, 2025, 45(4): 404-410.

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