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本文描述ＢＭＳ主漂移室（ｕｐｇｒａｄｅ）全长单元模型结构，阳极丝信号引出方案的实验比较，气体放大系数和工作区，能量分辨率和电离脉冲幅度沿阳极丝的衰减以及室本体的内筒外壁和外筒内壁上的补偿电场对主漂移室第一层和第十层阳极丝输出幅度的影响。模型的建造经验和实验结果将为ＢＥＳ新建主漂移室提供可靠的参考数据。
This paper describes the structure of the full-length unit model of BMS main upgrade and the experimental comparison of the signal extraction scheme of the anode wire. The gas amplification factor and work area, the energy resolution and the attenuation along the anode wire of the ionization pulse amplitude, And the compensation of the external wall of the electric field on the main drift chamber first layer and the tenth layer anode wire output amplitude. The model construction experience and experimental results will provide reliable reference data for BES new main drift chamber.