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In ] experiments, an '''absorber''' is a block of material used to ] some of the energy of an incident ]. Absorbers can be made of a variety of materials, depending on the purpose; ] and ] are common choices.
Most absorbers are used as part of a ].
A more recent use for absorbers is for ionization cooling, as in the ].
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In ], the most important part of the collector takes up the heat of the ] ] through a medium (water + ]). This is heated and circulates between the collector and the storage tank. A high degree of efficiency is achieved by using black absorbers or, even better, through selective coating.