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A thermal absorber including a light-transparent reservoir having an alkali metal received therein, a housing sealingly coupled to the reservoir to define an enclosed volume, the housing including a thermal barrier wall that divides the volume into a cold chamber and a hot chamber, the cold chamber

A thermal absorber including a light-transparent reservoir having an alkali metal received therein, a housing sealingly coupled to the reservoir to define an enclosed volume, the housing including a thermal barrier wall that divides the volume into a cold chamber and a hot chamber, the cold chamber including a sump having a drain hole in fluid communication with the hot chamber, and at least one AMTEC cell supported by the cell supporting surface, the AMTEC cell extending through the cold chamber and the hot chamber.

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1. A thermal absorber comprising: a light-transparent reservoir having an alkali metal received therein;a housing sealingly coupled to said reservoir to define an enclosed volume, said housing including a thermal barrier wall that divides said volume into a cold chamber and a hot chamber, said therm

1. A thermal absorber comprising: a light-transparent reservoir having an alkali metal received therein;a housing sealingly coupled to said reservoir to define an enclosed volume, said housing including a thermal barrier wall that divides said volume into a cold chamber and a hot chamber, said thermal barrier wall including a sump in said cold chamber having a drain hole in fluid communication with said hot chamber;at least one alkali metal thermal-to-electric converter (“AMTEC”) cell supported by said thermal barrier wall, said AMTEC cell extending through said cold chamber and said hot chamber; anda support structure connected to orient said housing such that at least a portion of said cold chamber is at an elevation above at least a portion of said hot chamber, and said sump is positioned at a relatively lower elevation portion of said cold chamber such that said alkali metal condensing in said cold portion flows downwardly along said thermal barrier wall by gravity to collect in said sump, and flows from said sump through said drain hole by gravity to said hot chamber. 2. The thermal absorber of claim 1 wherein said reservoir is formed from at least one of a glass or a ceramic. 3. The thermal absorber of claim 1 wherein said reservoir is formed from low iron glass. 4. The thermal absorber of claim 1 wherein said alkali metal is sodium. 5. The thermal absorber of claim 1 wherein said thermal barrier wall extends between two side walls of said housing. 6. The thermal absorber of claim 1 wherein said thermal barrier wall defines a hole therein, and wherein said AMTEC cell extends through said hole. 7. The thermal absorber of claim 6 further comprising a thermal adhesive that secures said AMTEC cell to said thermal barrier wall. 8. The thermal absorber of claim 1 further comprising a highly thermally conductive material coupled to a portion of said housing surrounding said cold chamber. 9. The thermal absorber of claim 1 wherein said sump is disposed at a relatively lowest elevation portion of said cold portion. 10. A thermal absorber comprising: a reservoir being at least partially transparent to solar energy;an alkali metal received in said reservoir;a housing sealingly coupled to said reservoir to define a volume, said housing including a thermal barrier wall that divides said volume into at least a cold chamber and a hot chamber, said thermal barrier wall further defining a cell supporting surface and a sump in said cold chamber, said sump including a drain hole in fluid communication with said hot chamber;at least one alkali metal thermal-to-electric converter (“AMTEC”) cell supported by said cell supporting surface, said AMTEC cell extending through said cold chamber and said hot chamber; anda support structure connected to orient said housing such that at least a portion of said cold chamber is at an elevation above at least a portion of said hot chamber, and said sump is positioned at a relatively lower elevation portion of said cold chamber such that said alkali metal condensing in said cold portion flows downwardly along said thermal barrier wall by gravity to collect in said sump, and flows from said sump through said drain hole by gravity to said hot chamber. 11. The thermal absorber of claim 10 wherein said sump is at a lower elevation relative to said cell supporting surface such that liquid collected in said cold chamber is directed by gravity to flow from said cell supporting surface downwardly to said sump. 12. The thermal absorber of claim 10 wherein said reservoir is formed from at least one of a glass or a ceramic. 13. The thermal absorber of claim 10 wherein said reservoir is formed from low iron glass. 14. The thermal absorber of claim 10 wherein said alkali metal is sodium. 15. The thermal absorber of claim 10 wherein said thermal barrier wall extends between two side walls of said housing. 16. The thermal absorber of claim 10 wherein said cell supporting surface defines a hole therein, and wherein said AMTEC cell extends through said hole. 17. The thermal absorber of claim 6 further comprising a thermal adhesive that secures said AMTEC cell to said cell supporting surface. 18. The thermal absorber of claim 1 further comprising a highly thermally conductive material coupled to a portion of said housing surrounding said cold chamber.