A 50 mA CW deuteron RFQ is being built for a joint 973 project between Peking University and the Institute of Modern Physics. This RFQ adopts a high-frequency window-type structure. To study its RF properties and to v...A 50 mA CW deuteron RFQ is being built for a joint 973 project between Peking University and the Institute of Modern Physics. This RFQ adopts a high-frequency window-type structure. To study its RF properties and to validate the reliability of an electromagnetic simulation, two full-length aluminum models with tuners were built in succession. RF measurements were obtained from the test bench and compared to the simulations, including frequencies, quality factors, and electric fields of different modes and the field in aperture. Through field tuning, the maximal field unflatness for a single quadrant and the average asymmetry of four quadrants were reduced from 8.7% and ± 3.6% to 5.8% and ± 1.7%, respectively.Moreover, a tuning method of adjusting the gap distance between the endplates and the vanes was also studied in this paper.展开更多
针对岩爆评判模型中指标权重难以确定问题,提出一种"AHP+熵权法"组合赋权方法,引入Lagrange函数和欧氏距离函数,保证了主、客观权重与其差异程度相一致,最终获得理想的综合权重;基于逼近理想解排序法(technique for order pre...针对岩爆评判模型中指标权重难以确定问题,提出一种"AHP+熵权法"组合赋权方法,引入Lagrange函数和欧氏距离函数,保证了主、客观权重与其差异程度相一致,最终获得理想的综合权重;基于逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)的基本理论建立CW(combined weights)-TOPSIS综合评判模型并预测岩爆等级。实例应用结果表明,CW-TOPSIS岩爆评判模型的预测结果与实际相吻合,进一步验证了该模型的有效性及实用性,从系统评价、多因素指标角度为岩爆预测提供了一种切实可行的途径。展开更多
基金supported by the National Basic Research Program of China(No.2014CB845503)
文摘A 50 mA CW deuteron RFQ is being built for a joint 973 project between Peking University and the Institute of Modern Physics. This RFQ adopts a high-frequency window-type structure. To study its RF properties and to validate the reliability of an electromagnetic simulation, two full-length aluminum models with tuners were built in succession. RF measurements were obtained from the test bench and compared to the simulations, including frequencies, quality factors, and electric fields of different modes and the field in aperture. Through field tuning, the maximal field unflatness for a single quadrant and the average asymmetry of four quadrants were reduced from 8.7% and ± 3.6% to 5.8% and ± 1.7%, respectively.Moreover, a tuning method of adjusting the gap distance between the endplates and the vanes was also studied in this paper.
文摘针对岩爆评判模型中指标权重难以确定问题,提出一种"AHP+熵权法"组合赋权方法,引入Lagrange函数和欧氏距离函数,保证了主、客观权重与其差异程度相一致,最终获得理想的综合权重;基于逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)的基本理论建立CW(combined weights)-TOPSIS综合评判模型并预测岩爆等级。实例应用结果表明,CW-TOPSIS岩爆评判模型的预测结果与实际相吻合,进一步验证了该模型的有效性及实用性,从系统评价、多因素指标角度为岩爆预测提供了一种切实可行的途径。
