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Abstract--The ATLAS end-cap muon level-1 trigger system is divided into three parts; one off-detector part and two ondetector parts. Application specific IC (ASIC) and anti-fuse FPGA (Field Programmable Gate Array) are actively used in on-detector parts. Data transfer with Low-Voltage Data Signaling serial link (LVDS link) is used between two ondetector parts (15m apart) and G-Link (Hewlett-Packard 1.4Gbaud high speed data link) with optical transmission(90m) is used from one of the on-detector parts to the off-detector part. These components will suffer for ten years the radiation of approximately 200Gy of total ionizing dose (TID) and a hadron fluence of 2x10 10 hadrons/cm 2 . We have investigated systematically the radiation susceptibility to both total ionizing dose and single event effects for ASIC, FPGA, and Commercial Off The Shelf (COTS) serializer and deserializer chipsets for LVDS (two candidates) and G-Link (one) together. In this presentation we report the result of irradiation tests for these devices and discuss validity of them to use in the system.

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2The ATLAS endcap muon trigger system uses custom integrated circuits and electronic modules. It will provide fast trigger information at the LHC bunchcrossing rate of 40 MHz to be used in making the first-level trigger decision. A prototype of the system has been constructed and mounted on Thin Gap Chambers. We have tested the system using a 180 GeV muon beam in the CERN SPS H8 beam line. The SPS provided bunched-beam with 25 ns structure, which allowed us to check the system performance under conditions very similar to the ATLAS experiment, before proceeding to the massproduction phase. We will present results on the evaluation of the system performance.