Development of radiation-hard p-bulk microstrip detector

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We have developed a radiation hard silicon microstrip sensor to be operational at the LHC upgrade planned at CERN in Europe. The sensor utilizing p-type bulk material can tolerate up to the expected fluence of 10^<15>n/cm^2,showing a full depletion voltage below800V and yielding a collected charge sufficient for precision particle tracking. The sensor can also be biased to1000V without showing micro-discharge after optimizing the P-STOP and P-SPRAY concentrations. The performance concerning strip isolation, interstrip capacitance, and interstrip resistance is found acceptable. We have also designed a detector protection mechanism based on punch through against large signal current. These results led the ATLAS Collaboration to agree that our sensor is the baseline design.