RF heating at selected power supply protocols

An apparatus for applying RF energy to an object in an energy application zone via one or more antennas at a plurality of modulation space elements (MSEs), the apparatus comprising;

• a detector, configured to detect an electromagnetic response of the energy application zone to the applied RF energy, and send feedback signals indicative of the electromagnetic response;
• and
• at least one processor configured to:
• receive feedback signals sent from the detector, and based on the feedback signals:
• cause supply of RF energy to one or more of the antennas in a first subset of the plurality of MSEs, at a first power level common to the plurality of MSEs in the first subset and for a first time duration common to the MSEs of the first subset;
• and
• cause supply of RF energy to one or more of the antennas in a second subset of the plurality of MSEs, at a second power level common to the plurality of MSEs in the second subset and for a second time duration common to the MSEs of the second subset,
• wherein the first power level is higher than the second power level and the first time duration is shorter than the second time duration.