The Technical Design for the COMET Phase-I experiment is presented in this paper. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the ...field of an aluminium nucleus (\(\mu-e\) conversion, \(\mu^- N \to e^- N\)); a lepton flavor violating process. The experimental sensitivity goal for this process in the Phase-I experiment is \(3.1\times10^{-15}\), or 90 % upper limit of branching ratio of \(7\times 10^{-15}\), which is a factor of 100 improvement over the existing limit. The expected number of background events is 0.032. To achieve the target sensitivity and background level, the 3.2 kW 8 GeV proton beam from J-PARC will be used. Two types of detectors, CyDet and StrECAL, will be used for detecting the \mue conversion events, and for measuring the beam-related background events in view of the Phase-II experiment, respectively. Results from simulation on signal and background estimations are also described.
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