NOVELTY - The reactor has a vertically oriented reactor vessel (10) comprising a bottom section (14) containing a carbonaceous bed (20) and a top section (12) extending from the bottom section to a roof (16). The vessel includes feed ports (28) for supply of feed material into the top section. Each feed port distributes the feed material and includes a protrusion that extends into the vessel for material to enter next to a conical wall (18). The feed port has a distributive feed mechanism for injecting the material with force, additional to gravity, into the vessel.    USE - Plasma gasification reactor for use in a synthesized gas production system (claimed) for gasification of carbonaceous and non-carbonaceous feed material e.g. mixture of coal and biomass, to produce synthesized gas, slag and metals.    ADVANTAGE - The reactor minimizes the flow separation from the reactor wall and minimizes low velocity recirculation zones created as a result of the flow separation, thus achieving lower cost for both the steel required for the vessel and refractory lining of the vessel by the relative simplicity of the conical wall. The cross-sectional velocity of the reactor is uniform, thus enabling efficient usage of the reactor volume for the reactions performed. The gas generated within the reactor has minimum residence time of sufficient length to achieve satisfactory performance. The side entry points for passage of feed material are effective and simple to construct. The reactor can achieve more complete reactions of supplied materials for enhanced production of desired output products such as synthesized gas. The feed port is equipped with a distributive feed mechanism so as to enable more uniform distribution of feed material over the interior of the reactor's top section.    DESCRIPTION OF DRAWING(S) - The drawing shows an elevational view of a plasma gasification reactor in partial section.    Vertically oriented reactor vessel (10)    Top section (12)    Bottom section (14)    Roof (16)    Conical wall (18)    Carbonaceous bed (20)    Feed ports (28)