Single electron transistor for cryogenic detector read-out

Cryogenic detectors have been developed over the last few years in many fields. Here we proposed two types of single electron transistor read-out systems that would be able to operate in magnetic field. The one type was coupled with a super conduction tunnel junction detector and the other was coupled with a micro calorimeter. From calculation results, the coupling of the single electron transistor and the super conduction tunnel junction detector would easily detect X-rays in the configuration that the dot size and operation temperature were 200 nm square and 1.5 K respectively.