Development and applications of transition-edge sensors
This thesis focuses on the theory, development and applications of Transition- Edge Sensor (TES) arrays. The main results are the design and development of a fabrication process for a 256 pixel X-ray TES detector with a novel geometry and the development of a measurement setup for TES detectors used in elemental analysis with Particle Induced X-ray Emission (PIXE) measurements. In the early stages of this thesis we fabricated a small scale 32 pixel TES array, but for an actual application purposes the pixel count and the consistency of the fabrication needs to be higher. The cleanroom facilities in the Nanoscience Center are well suited for basic research but they are not suitable for a wafer scale processing. To make the fabrication of a large scale TES array possible we collaborated with VTT (Technical Research Centre of Finland) and used their Micronova clean room facilities for the fabrication of the detectors. We've shown a setup consisting of 12 pixels being used in a PIXE measurement with the best pixel having a remarkable 3.06 eV energy resolution at 5.9 keV. This kind of resolution has not been reported before for a wide band energy dispersive detector used in a PIXE system. The thesis will also show experiments done with an updated measurement system capable of analyzing the elemental contents of thin lm samples with 60 pixels. Also the energy e ciency of the setup is reported ...
PublisherUniversity of Jyväskylä
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- Väitöskirjat 
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Käyhkö, Marko (University of Jyväskylä, 2018)A transition-edge sensor array has been applied to particle-induced X-ray emission. We have characterized the detector for quantitative analysis and obtained minimum detection limit over two orders of magnitude better ...
Palosaari, Mikko; Kinnunen, Kimmo; Julin, Jaakko; Laitinen, Mikko; Napari, Mari; Sajavaara, Timo; Doriese, W. B.; Fowler, J.; Reintsema, C.; Swetz, D.; Schmidt, D.; Ullom, J.; Maasilta, Ilari (Springer New York LLC, 2014)In this paper we present a new measurement setup, where a transitionedge sensor detector array is used to detect X-rays in particle induced X-ray emission measurements with a 2 MeV proton beam. Transition-edge sensors ...
Palosaari, Mikko (2009)
Helenius, Ari (2017)Tutkielmassa määritettiin uuden suprajohtavan kvantti-interferenssilaitteen ja 256 pikseliä sisältävän sirun transitioreunailmaisimien ominaisuuksia. Komponentit vaativat erittäin matalia lämpötiloja ja suojauksen suurilta ...
Simultaneous Noise and Impedance Fitting to Transition-Edge Sensor Data Using Differential Evolution Helenius, A. P.; Puurtinen, T. A.; Kinnunen, K. M.; Maasilta, I. J. (Springer Science and Business Media LLC, 2020)We discuss a robust method to simultaneously fit a complex multi-body model both to the complex impedance and the noise data for transition-edge sensors. It is based on a differential evolution (DE) algorithm, providing ...