NOVELTY - The receiver produces heat at very high temperature in excess of 1000 degree celsius and radiates the heat to a containment element i.e. pipe, that contains heat transfer fluid, which absorbs the heat. The fluid includes liquid material, which is thermally and chemically stable at the temperature involved, and absorbs and delivers the heat to a reactor system to perform endothermic reaction, where the heat directly generates electricity through a high temperature heat engine. The fluid flows through a cavity receiver in the containment element.    USE - Tower-type solar receiver for use in a solar absorption system for converting electromagnetic/sunlight energy reflected from a collector e.g. heliostat collector and parabolic mirror (all claimed), to thermal energy for solar-driven endothermic thermochemical process applications e.g. water splitting applications for power generation, carbon dioxide capturing applications and syngas production applications.    ADVANTAGE - The receiver contains the fluid, which is stable at very high temperature to perform high temperature thermochemical processes, and the heat in the receiver can be used directly to generate electricity through the high temperature heat engine. The solar absorber system contains the collector, which collects solar radiation and directs the radiation to the receiver and improves efficiency by coating the collector with material, which converts highest frequency photons at higher efficiency and reflects remaining photons to the receiver, which can improve the system efficiency. The collector reflects light to fiber optical cables, which avoid a need for a power tower. The receiver includes a set of apertures, which allow the reflected light to enter the receiver, and an amount of heat lost due to re-radiation to an atmosphere depends on an amount of surface area that is exposed to the atmosphere, where sunlight is concentrated, so that efficiency of the receiver is maximized, and heat losses are effectively minimized to surroundings of the receiver by absorbing/capturing the thermal energy.    DETAILED DESCRIPTION - The liquid material is selected from a group consisting of liquid metal, liquid metal oxide or mixed metal oxide, molten salt, glass, liquid organic material and graphite, where the metal is selected from a group consisting of tin, aluminum, gallium, sodium, lead, lithium and bismuth. The containment element includes material selected from a group consisting of aluminum oxide, zirconia, magnesia, metal, metal carbide, nitride, boride and silicide and graphite. The high temperature heat engine is a brayton or combined brayton and rankine cycle engine. The cavity receiver includes shape such as spherical, circular, cylindrical, dome-shaped, heteroconical, elliptical or conical. The cavity receiver is a well-insulated enclosure. INDEPENDENT CLAIMS are also included for the following:    (1) a solar absorption system comprising a set of solar collectors    (2) a method for generating thermochemical power    (3) a system for generating thermochemical power.    DESCRIPTION OF DRAWING(S) - The drawing shows a photograph of a solar absorber system containing a tower receiver and a set of heliostats.