Non-linear effects in transition edge sensors for X-ray detection

S. R. Bandler, E. Figueroa-Feliciano, Naoko Iyomoto, R. L. Kelley, C. A. Kilbourne, K. D. Murphy, F. S. Porter, T. Saab, J. Sadleir

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


In a microcalorimeter that uses a transition-edge sensor to detect energy depositions, the small signal energy resolution improves with decreasing heat capacity. This improvement remains true up to the point where non-linear and saturation effects become significant. This happens when the energy deposition causes a significant change in the sensor resistance. Not only does the signal size become a non-linear function of the energy deposited, but also the noise becomes non-stationary over the duration of the pulse. Algorithms have been developed that can calculate the optimal performance given this non-linear behavior that typically requires significant processing and calibration work-both of which are impractical for space missions. We have investigated the relative importance of the various non-linear effects, with the hope that a computationally simple transformation can overcome the largest of the non-linear and non-stationary effects, producing a highly linear "gain" for pulse-height versus energy, and close to the best energy resolution at all energies when using a Wiener filter.

Original languageEnglish
Pages (from-to)817-819
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2
Publication statusPublished - Apr 14 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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