Two-Dimensional Read out of Large Muon Drift Tubes

测试了用锯齿形延迟线测量漂移管沿传感线的坐标的可行性。两个原型室由一个矩形铝管制成，横截面为10cmx5cm，长度为140cm。在这个管中，一个腔室（1型）在中心有一个感应线，在底部平面上有一个移位的锯齿形延迟线带。Type-2在垂直于平面的中心有相同的条带，在被条带分隔的部分的中心有两根感测线。感应丝为镀金钨丝，直径100 μ bb0 m。延迟线带光刻在包铜卡普顿带的两侧。阻抗为60 <OMEGA>，延迟时间为3.2ns/cm，总延迟时间为450ns。延迟线上感应到的脉冲高度约为感测线的1/10。然后，该腔室在有限流光模式下运行。采用70%氩气和30%异丁烷的混合物。在4.3kV时检测效率为98%。准直的Ru电子通过腔室到达闪烁计数器。一个带电粒子从感测线和延迟线的两端产生三个信号。这些信号的次数由10位、1ns分辨率的TDC测量。在延迟线的两个分布中，感应脉冲的传播速度均为3.28 <+！- > 0.01 ns /厘米。沿检测线的位置精度为4.7mm（type-1）和2.7mm（type-2）。另一个坐标是通过测量感应导线与闪烁计数器之间的时间差得到的。位置精度是1毫米的西格玛。采用100MHz FADC测量两端的脉冲高度，以测量诱导脉冲的衰减。得到的衰减系数为168cm。

The feasibility of using zig-zag delay line to measure the coordinate along the sense wire from a drift tubes was tested. Two prototype chambers made of a recutangular aluminium tube with the cross section of 10cmx5cm and length of 140cm have been constructed. In this tube a chamber(type-1) has a sense wire at the center and a shifted zig-zag delay line strip on the bottom plane. Type-2 has the same strip at the center vertical to the plane and two sense wires at the center of the section separated by the strip. The sense wire is gold plated tungsten 100 <mu> m diameter. The delay line strip is photo-etched on both sides of copper-cladded Kapton strip. The impeadance is 60 <OMEGA> , the delay time is 3.2ns/cm and the total delay time is 450ns. The pulse height induced on the delay line is about 1/10 of the sense wire. Then, the chamber operated in the limitted-streamer mode. A mixture of 70% Argon and 30% iso-Butane was used. The detection efficiency was 98% at 4.3kV. Well-collimated electrons of Ru come through the chamber to scintillation counter. A charged particle generates three signals from sense wire and the two ends of the delay line. Times of these signals were measured by 10 bit, 1ns resolution TDC. The propagation velocity of the induced pulses in both distributions of the delay line is obtained to be 3.28 <+!-> 0.01ns/cm. The position accuracies along the sense wire are sigma of 4.7mm(type-1) and 2.7mm(type-2). The other coordinate was obtained by measuring the time difference between the sense wire and the scintillation counter. A position accuracy is sigma of 1mm. Pulse heights from the ends were measured using 100MHz FADC to measure attenuation of induced pulse. The attenuation factor obtained is 168cm.