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==Principle of operation==
A TES consists of a small volume of [[superconductivity|superconducting]] material that is cooled below its superconducting critical temperature and electrically biased on the superconducting transition. In this state, the device has a finite [[electrical resistance]] that is less than the resistance in the fully non-superconducting state. Energy coupled to the detector increases its temperature, pushing it further into the non-superconducting state and thereby increasing its electrical resistance. This increase in resistance can be used to detect very small changes in temperature, and hence in energy. TESs are commonly operated with low noise [[SQUID]] readouts. The low input impedance of the SQUID provides negative [[electrothermal feedback]] that can significantly speed up the device response and improve the energy resolution.<ref>K. D. Irwin and G. C. Hilton, "Transition-Edge Sensors," ''Cryogenic Particle Detection'', ed. C. Enss, Springer, 2005, [http://dx.doi.org/10.1007/10933596_3 doi:10.1007/10933596_3]</ref>
==Applications==
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