In cuprate high-temperature superconductors, recent resonant inelastic x-ray scattering (RIXS) experiments suggest that intense paramagnon excitations persists to rather high doping, but such excitations have not been observed by inelastic neutron scattering (INS). This discrepancy is a subject of heated debate, since the magnetic excitations might be important for the superconductivity. A possible explanation is that the two techniques typically probe excitations in different momentum regions which exhibit different doping dependences. Here we propose to study high-energy magnetic excitations in an unprecedentedly large and highly uniform sample of superconducting YBa2Cu3O6.6 on the MAPS spectrometer, with focus on the momentum region where a direct comparison with the RIXS data can be made. This will help verify the RIXS results with the well understood scattering cross section of INS.