Design and Optimization of Deuterium-Deuterium Fusion Neutron Source Large-Size and High Magnetic Field Magnetic Compression Magnet

doi:10.12096/j.2096-4528.pgt.24173

Abstract

Abstract:

Objectives In order to truly reflect the damage characteristic of fusion neutron irradiation, it is necessary to carry out research on high-flux fusion neutron sources. As the first experimental device in the world that can realize cascaded magnetic compression with high compression ratio of field-reversed configuration plasma, the preliminary research device of magnetic confinement deuterium-deuterium fusion neutron source has important scientific significance. As one of the core components of the device, the magnetic compression magnet was designed to increase the magnetic induction intensity of the central magnetic field from 0 T to 7 T within 500 μs. Therefore, a design idea for the conductor part of the magnetic compression magnet was proposed. Methods Based on the conductor design of magnet, the conductor stress was analyzed by finite element simulation software from the three aspects of conductor material selection, conductor turn distance and conductor radial thickness. The influence of conductor material conductivity, conductor turn distance and conductor radial thickness on conductor stress was obtained. Results The design idea of the next magnet is determined. That is, the conductor material with low conductivity is appropriately selected within the allowable range of ohmic loss, the conductor turn spacing is appropriately increased by increasing the thickness of the insulation layer within the allowable range of axial space, and the radial thickness of the conductor is appropriately reduced within the allowable range of material stress to reduce the construction cost. Conclusions With the further development of the preliminary research device of neutron source project, the design ideas proposed in this paper can provide optimization direction for the design of magnetic compression magnet device.

Key words: controllable nuclear fusion, magnetic compression magnet, fusion neutron source, large-size pulsed high-field magnet, finite element analysis, deuterium-deuterium fusion, magnetic field

CLC Number:

TK 01

Yushen ZHOU, Yuan PAN, Chuan LI, Bo RAO, Yong YANG. Design and Optimization of Deuterium-Deuterium Fusion Neutron Source Large-Size and High Magnetic Field Magnetic Compression Magnet[J]. Power Generation Technology, 2024, 45(6): 1016-1022.

Figures/Tables 14

Fig. 1 Schematic diagram of the preliminary research device of magnetic confinement deuterium-deuterium fusion neutron source

Fig. 2 Schematic diagram of compression magnet

Fig. 3 Structure diagram of coil group

Fig. 4 Schematic diagram of simulation model

Tab. 1 Specific parameters oflength

参数		长度/mm
参数		L₁	L₂	L₃	L₄
匝间距/mm	6	2 000	189	230	212
	10	2 000	167	250	220
	14	2 000	145	270	228
径向厚度/mm	150	2 000	145	270	178
	175	2 000	145	270	203
	200	2 000	145	270	228

Tab. 2 Electrical parameters of conductor material

材料	相对介电常数 $ε r$	相对磁导率 $μ r$	体积电导率 $σ$ /(MS/m)
纯铜	1	0.999 991	58
B30白铜	1	1.03	4.7

Tab. 2 Electrical parameters of conductor material

材料	相对介电常数 $ε r$	相对磁导率 $μ r$	体积电导率 $σ$ /(MS/m)
纯铜	1	0.999 991	58
B30白铜	1	1.03	4.7

Tab. 3 Coil group material structure parameters

材料	杨氏模量/GPa	泊松比	许用应力/MPa
纯铜	120	0.343	70
B30白铜	150	0.32	200
环氧树脂	24	0.13	250

Fig. 5 Curves of magnetic induction intensity at each radial position of different conductor materials

Fig. 6 Peak current density cloud map of different conductor materials

Fig. 7 Equivalent stress nephogram of coil groups with different conductor materials

Fig. 8 Equivalent stress nephogram of coil group with different turn spacing

Fig. 9 Curve of magnetic induction intensity under different insulating thicknesses

Fig. 10 Equivalent stress nephogram of coil groups with different radial thicknesses

Tab. 4 Maximum normal stress of coil group with different radial thicknesses

径向厚度/mm	等效应力/MPa	径向应力/MPa	轴向应力/MPa	环向应力/MPa
150	191.47	-57.80	-49.58	173.41
175	172.21	-58.89	-49.99	154.31
200	159.44	-59.61	-50.23	140.12

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