BESⅢ漂移室性能研究以及数据质量监测

The Study of the Performance of BESIII Drift Chamber and the Monitor of Data Quality

研究了BESⅢ漂移室(MDC)时间测量道的性能,包括空间分辨、动量分辨、击中效率、噪声率和Bhabha事例重建效率等。并用2011年的Bhabha事例样本对MDC性能作了run by run监测,研究了引起数据质量变化的各种因素。另外还研究了工作高压丢失(trip)对MDC性能的影响,此外,为了提高数据质量开发了相应软件包以去掉受高压丢失影响的事例。

The performance of time channels of the BESIII drift chamber（MDC） has bee studied, including spatial resolution, momentum resolution, hit efficiency, noise ratio and reconstruction efficiency of Bhabha events. Monitoring of the MDC performance run by run using Bhabha events taken in 2011 is reported. Factors which have impact to the data quality are also studied. In addition, high voltage trip which has impact to the MDC performance is studied. In order to improve the data quality, a software package has been developed to skip the events with high voltage trip.