一种用于非均匀等离子体射流的双探针、诊断方法及系统

本发明公开了一种用于非均匀等离子体射流的双探针、诊断方法及系统,方法包括如下内容：双探针的两根金属电极包裹于非均匀等离子体射流内,通过改变串接在所述双探针上的扫描电压的大小,采集每个扫描电压下所述双探针内的电流,根据扫描电压和对应的电流拟合I-V曲线,根据所述I-V曲线的参数得到超声速非均匀等离子体射流的特征参数。本发明还公开了应用于该方法的系统及双探针的结构,本发明提供的双探针、诊断方法及系统,能够适用于超声速非均匀等离子体射流,通过测量扫描电压和对应电流数据,无需微分计算就能够得到超声速非均匀等离子体射流的特征参数,解决了超声速流动下等离子体非均匀性的特征测量问题

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^