Abstract
At SRON we are developing Frequency Domain Multiplexing
for the read-out of superconducting transition edge
sensor microcalorimeters for future X-ray astrophysical
missions. We will report on the performance of Goddard
Space Flight Center pixels under AC bias in the MHz
frequency range. Superconducting flux transformers are
used to improve the impedance matching between the low
ohmic TESs and the SQUID. We connected 5 pixels to the LC
filters with resonant frequencies ranging between 1 and 5
MHz. For X-ray photons of 6 keV we measured a best X-ray
energy resolution of 3.6 eV at 1.4 MHz, consistent with
the integrated Noise Equivalent Power. In addition, we
improved the electrical circuit by optimizing the
coupling ratio of the impedance matching transformer. In
addition, we improved electrical circuit for impedance
matching; modified transformer coupling ratio. As a
result, we got the integrated noise equivalent power
resolution of 2.7 eV at 2.5 MHz. A characterization of
the detector response as a function of the AC bias
voltage, bias frequency and the applied magnetic field is
presented
Original language | English |
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Pages (from-to) | 591-596 |
Journal | Journal of Low Temperature Physics |
Volume | 176 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 2014 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Microcalorimeter
- transition edge sensor
- X-ray