NOVELTY - The receiver (100) has first and second fin (104,106) with first and second heat discharge portion discharge heat energy through convective loss. Proximal portion of first and second base is connected to discharge portion at transverse angle. The bases includes first and second outer base surface. First connector portion is connected to first distal portion at transverse angle. The outer base surfaces are aligned along plane and thermally connected to photo-sensitive device. Connector portion engages with second discharge portion at location spaced away from plane and from distal portion.    USE - Photovoltaic solar receiver for improving thermal conductivity performance characteristics of cooling device e.g. heat sink of assembly (all claimed).    ADVANTAGE - The arrangement of portions of the outer surface of the connector portion and an outer surface of the heat discharge portions flatly against each other provides a more continuous surface contour and this avoids the surface irregularities in the vicinity of outer base surface caused by the zippered of the collectors. Thus partial discharge failure is reduced or eliminated and has eliminated the need for the additional metallic layer. The solar energy receiver is manufactured with lower cost and with reduced tendency for partial discharge failure. The reinforcing elements engaging with the recess provides rigidity and resistance against bending of the fins. The connection of bases of the fin elements with connection devices that are spaced away from the bases, improve thermal conductivity performance characteristics.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a heat sink assembly for photovoltaic receiver; and    (2) a heat sink for photovoltaic receiver.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a photovoltaic solar receiver including a heat sink with a fin array.    Reflector (18)    Thermally conductive material (50)    Photovoltaic solar receiver (100)    Heat sink assembly (102)    Fins (104,106,108)