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J-PARC Main Ring (MR) study has been performed during 2013-2014 to optimize the machine performance. As the result of this activity the ‘200 kW’ proton beam has been successfully extracted from MR into the ‘Neutrino’ beamline. Total particle losses, localized at the MR collimation section, have been estimated as 150 W. The 'low-losses' MR operation has been achieved after optimization the injection process, setting the MR RF system, dynamic control of the chromaticity and compensation the linear coupling resonance. In frame of this report we will discuss the obtained experimental results and compare it with simulations, performed extensively for different machine operation scenario, including the 'pencil' low intensity beam and the space-charge dominated beam. The obtained results demonstrate agreement between simulations and measurements for emittance evolution and losses for different cases. The developed MR computational model will be used to optimize the machine performance for the ‘MegaWatt’ MR operation scenario with limited losses. The modeling of the beam dynamics for these cases has been performed by using the ‘PTC-ORBIT’ combined code, installed on the KEK supercomputer.
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