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在中性束离子源引出过程中,详细分析了引出束流的产生,这有利于得到更准确的引出功率和引出电极表面的热功率沉积情况。根据HL-2A装置中性束离子源引出电极的电连接方式和束流引出的物理过程,对离子源束流引出过程进行了分析,给出抑制极电流产生的主要来源。通过分析放电气压扫描实验中的结果发现:随着放电气压的增加,不同弧放电电流情况下抑制极电流均逐渐增加,且抑制极电流与引出电流的比值近似线性增加。针对引出离子束流经过引出电极的过程建立了物理模型。计算了抑制极电流与引出电流的比值与放电气压的依赖关系,计算结果与实验结果一致,验证了引出束流分析结果的合理性。
In the process of extracting the neutral beam ion source, the generation of the outgoing beam is analyzed in detail, which is beneficial to obtain the more accurate extraction power and the thermal power deposition on the extraction electrode surface. According to the electrical connection mode and the physical process of beam extraction of neutral beam ion source in HL-2A device, the extraction process of ion source beam is analyzed and the main source of suppressing the generation of pole current is given. By analyzing the results of discharge gas pressure scanning experiment, it is found that with the increase of discharge pressure, the inhibitory pole current increases gradually with different arc discharge current, and the ratio of the inhibit pole current to the drawn current increases approximately linearly. A physical model is established for the process of extracting the ion beam through the extraction electrode. The dependence of the ratio of the suppression current to the extraction current on the discharge gas pressure was calculated. The calculation results agree well with the experimental results, which verify the rationality of the analysis results of the extracted beam current.