Operation of transition-edge sensors with excess thermal noise

I.J. Maasilta (Corresponding Author), K.M. Kinnunen, A.K. Nuottajärvi, J. Leppäniemi, Arttu Luukanen

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)


The superconducting transition-edge sensor (TES) is currently one of the most attractive choices for ultra-high resolution calorimetry in the keV x-ray band, and is being considered for future ESA and NASA missions. We have performed a study on the noise characteristics of Au/Ti bilayer TESs, at operating temperatures around ~100 mK, with the SQUID readout at 1.5 K. Experimental results indicate that without modifications the back-action noise from the SQUID chip degrades the noise characteristics significantly. We present a simple and effective solution to the problem: by installing an extra shunt resistor which absorbs the excess radiation from the SQUID input, we have reduced the excess thermal (photon) noise power down by approximately a factor of five, allowing high resolution operation of the sensors.
Original languageEnglish
Pages (from-to)S242-S245
JournalSuperconductor Science and Technology
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed


  • transition edge sensors
  • calorimeters
  • superconducting microwave devices
  • superconducting transistors


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