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Helicon plasma sources are known as efficient generators of uniform and high density plasma. A helicon plasma source was developed for the investigation of plasma stripping and plasma lenses at the Institute of Modern Physics, CAS. In this paper, the characteristics of helicon plasma have been studied by using a Langmuir four-probe and a high plasma density up to 3.9× 10^13/cm^3 has been achieved with the Nagoya type III antenna. In the experiment, several important phenomena were found： （1） for a given magnetic induction intensity, the plasma density became greater with the increase of RF power; （2） helicon mode appeared at RF power between 300 W and 400 W; （3） the plasma density gradually tended to saturation as the RF power increased to the higher power; （4） a higher plasma density can be obtained by a good match between the RF power and the magnetic field distribution. The key issue is how to optimize the matching between the RF power and the magnetic field. Moreover, some tests on the extraction of ion beams were performed, and preliminary results are given. The problems which existed in the helicon ion source will be discussed and the increase in beam density will be expected by extraction system optimum. 相似文献
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随着空调的普及,它已经成为高峰期用电负荷增大的主要原因;冰蓄冷技术能够很好地解决在用电高峰期由于空调用电过多造成负荷过大的问题,实现电力资源的移峰填谷功能,但其也带来了总体电力消耗增加的问题。针对此问题,首先建立了与冰蓄冷空调系统相关的数学模型;然后,将系统最小寿命周期成本作为目标函数,采用粒子群算法(PSO,Particle Swarm Optimization)对冰蓄冷空调系统进行优化,并制定出最佳的运行策略。研究结果表明,方法在保证系统运行经济性的前提下,能够有效地降低冰蓄冷空调系统的电力消耗,实现冰蓄冷空调系统的优化,达到节省成本和资源的目的。 相似文献
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液化天然气冷能的再汽化温度区间跨度大,传统单一的冷能利用方式很难实现高效利用。而现阶段的多联产系统大多以串联方式进行耦合,会存在不同利用方式温度区间重叠的问题,无法使各个单元均处在最佳的温度区间。针对这一问题,本文提出了一种混联耦合的水合物海水淡化–冷电联产系统,对系统中5种参数进行了敏感性分析。最后分别以系统的效率和净现值为目标函数进行优化,其最高效率可达42.93%,最高净现值为593×106USD。并分析两种优化方案下的传热匹配和冷量分配情况,为提高未来LNG冷能利用的多联产系统能量效率和经济性,打下了良好的基础。 相似文献
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