Latest progress of development of the neutral beam injection heating system on HL-2M Tokamak
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摘要: 为开展磁约束堆芯燃烧等离子体物理实验，正在建造的HL-2M装置拟建造3条5 MW的中性束注入加热束线。简要概述了HL-2M装置NBI加热系统的总体规划，第1条5MW-NBI加热束线的设计，离子源调试实验，注入器核心部件的安装和测试结果。通过调试，目前单个离子源引出束流达到36 A，加速电压75 kV，离子束功率达到2.4 MW，脉冲宽度3 s。通过测试发现：注入器的4条离子束汇聚角误差小于±0.1°，残留离子偏转磁体的磁场测试值与模拟计算值偏差小于±5%，注入器静态真空值达到1.0×10-3 Pa。注入器采用大型非标低温泵，低温泵的抽速达到2.40×106 L/s。第1条5MW-NBI加热束线的试装和测试结果表明，该束线能够满足HL-2M装置NBI加热的技术要求。Abstract: In order to carry out the physical experiment of magnetic confinement core combustion plasma, the HL-2M device under construction is intended to construct three 5 MW neutral beam injection heating lines. This paper briefly outlines the overall planning of the neutral beam injection (NBI) heating system of the HL-2M device, the design of the first 5MW-NBI heating beam line, the ion source commissioning experiment, the installation and test results of the injector core components. Through debugging, for single ion source the extraction beam current reaches 36 A, the acceleration voltage is 75 kV, the ion beam power reaches 2.4 MW, and the pulse width is 3 s. It is found by testing that the convergence angle error of 4 ion beam from the injector is less than +0.1°, the deviation between the test values and simulation values of magnetic field with deflecting magnet for deflecting residual ions is less than ±5%, and the static vacuum value of the injector reached 1.0×10-3 Pa. The injector has adopted a large non-standard cryogenic pump with a pumping speed of 2.4×106 L·s-1. The trial assembly and test results of the first 5MW-NBI heating beam show that the beam line can meet the technical requirements of NBI heating on HL-2M device.
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Key words:
- NBI heating beam-line /
- injector /
- ion source /
- cryopump
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图 1 HL-2M装置5MW-NB注入器几何汇聚坐标
Figure 1. Beam geometrical convergence coordinates of 5MW-NB (5 MW neutral beam) injector on HL-2M
图 2 不同几何汇聚角下，HL-2M装置中性束功率转换效率与离子源束元发散角的关系
Figure 2. Dependence of neutral beam injection (NBI) power injection efficiency on beamlet divergence under different geometric convergence angles
图 4 离子源测试平台上实验调试中的离子源
Figure 4. Photo of ion source in experimental setup on the ion test bed
图 5 两种孔径多孔电极引出束流与抑制电压与加速电压之比
Figure 5. Dependence of ion beam current on the ratio of decelerating voltage to accelerating voltage
图 6 弧流251 A时两种孔径电极引出水平方向束半宽度与导流系数关系
Figure 6. Relation between horizontal beam 1/e-half-width (x-1/e width) and perveance for two aperture size grids at arc current 251 A
图 7 孔径6.9，孔数560电极加速结构典型的引出波形
Figure 7. Typical extraction beam waveform of the accelerator with 560 ϕ6.9 mm apertures
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