Abstract
The thin gap chambers (TGCs) are used for the muon trigger system in the end-cap regions of the ATLAS detector. The TGC mass production phase at High Energy Accelerator Research Organization (KEK) started in January 2001. As the anode-cathode distance is small, 1.4 mm, chamber flatness is essential to achieve a uniform gas gain over the chamber. In order to perform a stable production with high quality we developed a chamber closing system. When we glue two half-chambers together, we sandwich them between a granite table and an aluminum honeycomb panel to keep the chamber flat from both sides. By using silk screens, we control the quantity of epoxy adhesive that affects the chamber thickness. Due to these developments, we can achieve the flatness of less than 100 /spl mu/m. Uniformity of detection efficiency of the TGC is measured with a cosmic-ray test bench at Kobe University. So far we have tested 300 TGCs. Position dependence of the efficiency is measured with a granularity of 5 mm /spl times/ 5 mm. The average efficiency over the tested chambers is achieved to be 99% excluding the wire supports and spacers.
Highlights
The Thin Gap Chambers (TGCs) are used for the muon trigger system in the end-cap regions of the ATLAS detector [1]-[3]
The TGC is characterized by fast signal response (99 % of the output signals are within 25 ns) for charged particles [4], [5]
Each TGC has a trapezoidal shape, whose dimensions depend on its location
Summary
The Thin Gap Chambers (TGCs) are used for the muon trigger system in the end-cap regions of the ATLAS detector [1]-[3]. The TGC is characterized by fast signal response (99 % of the output signals are within 25 ns) for charged particles [4], [5]. This characteristic suits the muon trigger detector of the Large Hadron Collider (LHC), which is required to identify the bunch crossing at 40 MHz. Each TGC has a trapezoidal shape, whose dimensions depend on its location. ATLAS TGC chambers are produced in parallel in Japan, Israel and China. In order to meet this schedule the KEK production facility was designed to produce two TGCs per day with about twelve workers and three physicists as supervisors
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