Study of TES Detector Transition Curve to Optimize the Pixel Design for Frequency-Division Multiplexing Readout
Marcel Ridder (SRON–Netherlands Institute for Space Research)
K. Nagayoshi (SRON–Netherlands Institute for Space Research)
M.P. Bruijn (SRON–Netherlands Institute for Space Research)
L. Gottardi (SRON–Netherlands Institute for Space Research)
E. Taralli (SRON–Netherlands Institute for Space Research)
P Khosropanah (SRON–Netherlands Institute for Space Research)
H. Akamatsu (SRON–Netherlands Institute for Space Research)
J. van der Kuur (SRON–Netherlands Institute for Space Research)
K. Ravensberg (SRON–Netherlands Institute for Space Research)
S. Visser (SRON–Netherlands Institute for Space Research)
A. C.T. Nieuwenhuizen (SRON–Netherlands Institute for Space Research)
J.R. Gao (TU Delft - ImPhys/Optics, Kavli institute of nanoscience Delft, SRON–Netherlands Institute for Space Research)
J. W. den Herder (SRON–Netherlands Institute for Space Research)
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Abstract
Superconducting transition-edge sensors (TESs) are highly sensitive detectors. Based on the outstanding performance on spectral resolution, the X-ray integral field unit (X-IFU) instrument on-board athena will be equipped with a large array of TES-based microcalorimeters. For optimal performance in terms of the energy resolution, it is essential to limit undesirable nonlinearity effects in the TES detector. Weak-link behavior induced on the TES by superconducting leads is such a nonlinearity effect. We designed and fabricated smart test structures to study the effect of the superconducting leads on the intrinsic transition curve of our TiAu-based TES bilayer. We measured and analyzed the resistance versus temperature transition curves of the test structures. We found relations of long-distance proximity effects with TES length and different lead materials. Based on these results, we can redesign and further optimize our TES-based X-ray detectors.