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High resolution calorimetry with TESs: s tatus report

This report provides an overview of the current status of Transition-Edge Sensors (TESs) in high-resolution calorimetry. It discusses the challenges and advancements in temperature control, readout, and performance trade-offs. The report also highlights the developments in TES technology and the requirements for achieving desired energy resolutions.

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High resolution calorimetry with TESs: s tatus report

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  1. High resolution calorimetry with TESs: status report M. Rajteri, E. Monticone Nanoscience and Materials Division Strada delle Cacce 91 10135 Torino - Italy

  2. Transition-Edge Sensors (TESs) TES:a microcalorimeter made by a superconducting film operated in the temperature region between the normal and the superconducting state Ti/Au Bilayer – proximity effect • TESs are very sensitive: •  temperature control difficult •  • Voltage biasing and electrothermal feedback • TESs have low resistance: •  difficult readout •  • dc-SQUID amplifier

  3. TESsas single photon detectors 20 µm X 20 µm Rbias<< Rtes DT DR @ Voltage bias  DI

  4. TES: High energy resolution teff = 3.8 ms With Wiener filter DE= (0.113 ± 0.001) eV L. Lolli et al., Appl. Phys. Lett. 103, 041107 (2013)

  5. TES: multi-photoncounting 20X20 μm2 =1570 nm E=23 eV L. Lolli, et al. J. Low Temp. Phys., vol. 167, pp. 803-808, 2012.

  6. TES: Performances Transition sharpness  Effective response time  Trade-off between response time and energy resolution Energy resolution  Trade-off between energy resolution and saturation energy Saturation Energy

  7. CryogenfreeADR Tmin=30 mK - Hold time @ T=50mK : 39 h - Hold time @ T=100mK : >150 h

  8. ADR: magneticshield

  9. Ti/Au and Ti/Pd film Tc

  10. TES: film uniformity Thickness uniformity on chip 2x2 cm2 3%

  11. film Tc

  12. film and TES Tc  Films TESs 

  13. Energy resolution vs. Energy

  14. TES: developments PTOLEMY request Target:E = 0.05 eV @ 10eV…..but…… Phonon down-conversion noise  E depends on E (Kozorezov et al. J Low Temp Phys (2008) 151: 51–57) From ourexperiments E E   1/3 NIR Target: E=0.022eV @ 0.8eV Now: 0.11 eV @ 0.8 eV and 106 mK and 10x10 µm2  5x reductionrequested ET3/2  Tc= 36 mK @10x10 µm2

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