NOVELTY - Controlling temperature in gasifier system designed for converting carbonaceous materials to syngas, comprises: introducing fluidizing gas (preferably steam) into gasification reactor; introducing fluidizing gas through many nozzles located within each stage of gasifier system; operating gasification stages; pulsing oxygen, through many nozzles; flow rate at which oxygen is to be pulsed should be established such that local temperature rise within injection nozzle jet; and pulsing frequency of oxygen injection should be less than the characteristic bubble detachment frequency.    USE - The process is useful for controlling temperature in gasifier system for converting carbonaceous materials to syngas (claimed).    ADVANTAGE - The process utilizes pulsed oxygen to maintain the temperature of the gasification zones and to avoid hot spots in the gasification reactor. The gasifier system: has substantially decreased size; and eliminates the compression step typically required for post-gasifier conversion processes.    DETAILED DESCRIPTION - Controlling the temperature in a gasifier system designed for converting carbonaceous materials to a syngas, comprises: introducing fluidizing gas (preferably steam) into a gasification reactor containing a fluidized bed of solids; introducing a fluidizing gas through many nozzles located within each stage of the gasifier system where thermal energy can be added to support the gasification reaction; operating the gasification stage or stages at 1200-1800 degrees F; operating other gasification stages where the partial or complete oxidation occurs at 1200-1800 degrees F; pulsing oxygen, through the many nozzles, into the gasification reactor in order to keep the temperature of 1200-1800 degrees F, and to keep the partial oxidation zone of the nozzles below the fusion temperature of the inorganic fraction of the carbonaceous material, where the nozzles are divided into at least one sets of nozzles where each set is pulsing an oxygen at the same or at different times; the flow rate at which oxygen is to be pulsed should be established such that the local temperature rise within the injection nozzle jet remains below 2000 degrees F or less than the fusion temperature of the feed solids (whichever is lower); and the pulsing frequency of the oxygen injection should be less than the characteristic bubble detachment frequency for the nozzle system designed to maintain the appropriate fluidization. An INDEPENDENT CLAIM is also included for converting a biomass feedstock to a synthetic gas in a two-stage gasification process unit, comprises: introducing steam into a first gasification stage containing a fluidized bed of solids; introducing a fluidizing gas through a first many nozzles located at the bottom of the first gasification stage containing solids resulting in and maintaining a fluidized bed of the solids; operating the first gasification stage at 1000-1600 degrees F; introducing a biomass feedstock in particulate form into a first gasification stage containing the fluidized bed of solids where the residence time of then biomass in the first gasification stage is 5-90 seconds, resulting in a gaseous phase biomass product stream and a carbon-rich biomass particulate product; pulsing oxygen, through the many nozzles, into the first gasification stage in order to keep the temperature about 1000 degrees F but not greater than 1600 degrees F, and to keep the partial oxidation zone of the nozzles below the fusion temperature of the inorganic fraction of the biomass, where the nozzles are divided into at least one sets of nozzles where each set is pulsing an oxygen at the same or at different times; transporting at least a portion of the gaseous phase biomass product stream to a solid/gas separation unit where particles greater than a predetermined size are separated and returned to the first gasification zone and where the treated gaseous phase biomass product stream is transported to a second gasification stage; transporting solids and particulates from the first gasification stage to a second gasification stage; introducing, through a second many nozzles, a fluidizing gas into the second gasification stage resulting in a second fluidized bed of biomass particulates and fluidizing solids; operating the second gasification zone at 1600-2000 degrees F, but at least 50 degrees F greater than the first gasification stage and at a residence time of 1-3 times that of the first gasification stage; pulsing an oxygen through the second many nozzles of the second gasification stage in order to maintain the second fluidized bed at 1600-2000 degrees F, 1700-1800, and to keep the partial oxidation zone of the nozzles below the fusion temperature of the inorganic fraction of the biomass, where the nozzles are divided into at least one sets of nozzles where each set is pulsing an oxygen at the same or at different times, resulting in the biomass being converted to a gaseous phase and a solid phase; returning at least a portion of the solids to the first gasification stage; passing the syngas stream to a solids/gas separation zone where substantially all of the remaining solids are removed, resulting in a substantially solids free syngas stream; passing the syngas product stream to downstream processing; and removing any excess solids from the gasification process unit to maintain a predetermined balance of solids.    DESCRIPTION OF DRAWING(S) - The figure shows representation of the time sequencing of oxygen injection into the gasification reactor.    Primary gasification vessel (10)    Secondary gasification vessel (20)    Line (30)    Standpipe (40)    Syngas transfer line (140)