合肥光源逐束团测量系统研制

 逐束团测量装置属于宽带和实时测量，足以分辨重复频率为204 MHz的相邻束团的信号，设计功能包括横向水平和垂直Beta振荡，纵向同步相位振荡，束团填充等信息的实时检测。对信号频谱分析，系统参数设计，前端射频检测，锁相环信号合成，高速数据采集以及基于PXI的整个系统作了详细介绍，分析了若干调试和实验结果，并讨论了合肥光源储存环目前存在的不稳定性及该测试手段在诊断中的应用。     

八电极束流能散检测器的计算与标定

针对合肥光源高亮度注入器设计了一种四轴对称八条带电极束流能散检测器(BESM),以实现束流能散的非拦截测量。理论推导了从BESM电信号中提取束流横向尺寸分量的公式。通过对BESM的灵敏度、阻抗匹配、电极的时域频域响应等的分析,确定了BESM的电极张角、半径、长度等各方面的物理参数。通过天线法对BESM进行了位置和四极分量的标定,得到了电中心相对于机械中心的偏移、 BESM的位置灵敏度和四极分量灵敏度等参数。通过对多组电信号和位置信号的处理拟合出了机械位置与对数比电位置信号的相关多项式,并给出了四极分量关于束流横向尺寸、束流中心位置以及它们高次项的经验公式。     

A new measurement method for electrode gain in an orthogonally symmetric beam position monitor

The new beam position monitor (BPM) system of the injector at the upgrade project of the Hefei Light Source (HLS Ⅱ) has 19 stripline beam position monitors. Most consist of four orthogonally symmetric stripline electrodes. Differences in electronic gain and mismachining tolerance can cause changes in the beam response of the BPM electrodes. This variation will couple the two measured horizontal positions, resulting in measuring error. To alleviate this effect, a new technique to measure the relative response of the four electrodes has been developed. It is independent of the beam charge, and the related coefficient can be calculated theoretically. The effect of electrode coupling on this technique is analyzed. The calibration data is used to fit the gain for all 19 injector beam position monitors. The results show the standard deviation of the distribution of measured gains is about 5%.     

煤中可溶有机质对煤的孔隙结构及甲烷吸附特性影响

采用四氢呋喃对临涣7煤和祁南3煤进行微波辅助抽提,进行了原煤和残煤等温吸附实验和低温氮气吸附测试,对比分析了抽提前后原煤和残煤的甲烷吸附量和比表面积、孔分布情况,并理论测算煤中可溶有机质吸附溶解甲烷量.结果表明,残煤的甲烷吸附能力低于原煤;抽提后,煤的比表面积和总孔体积增大,平均孔径减少,影响煤吸附气体能力的主要孔径为1.7~5.0 nm,且该范围内的孔数有不同程度的增加;压力为0.1~5.0 MPa时,两煤样中可溶有机质吸附溶解的甲烷量分别为0.45~4.22 mL/g、0.69~4.99 mL/g,最大吸附量分别占到原煤最大吸附量的30%和38%.分析认为,煤中可溶有机质占据部分煤中孔隙,影响煤孔隙结构,同时,在压力的作用下,甲烷可以溶解和吸附煤中可溶有机质.