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The first Large Size Telescope (LST-1) of the Cherenkov Telescope Array hasbeen operational since October 2018 at La Palma, Spain. We report on theresults obtained during the camera commissioning. The noise level of thereadout is determined as a 0.2 p.e. level. The gain of PMTs are well equalizedwithin 2\% variation, using the calibration flash system. The effect of thenight sky background on the signal readout noise as well as the PMT gainestimation are also well evaluated. Trigger thresholds are optimized for thelowest possible gamma-ray energy threshold and the trigger distributionsynchronization has been achieved within 1~ns precision. Automatic rate controlrealizes the stable observation with 1.5\% rate variation over 3 hours. Theperformance of the novel DAQ system demonstrates a less than 10\% dead time for15 kHz trigger rate even with sophisticated online data correction.

Commissioning of the camera of the first Large Size Telescope of the Cherenkov Telescope Array