Optimized Designs for Very Low Temperature Massive Calorimeters

Abstract

The baseline energy-resolution performance for the current generation of large-mass, low-temperature calorimeters (utilizing TES and NTD sensor technologies) is $>2$ orders of magnitude worse than theoretical predictions. A detailed study of several calorimetric detectors suggests that a mismatch between the sensor and signal bandwidths is the primary reason for suppressed sensitivity. With this understanding, we propose a detector design in which a thin-film Au pad is directly deposited onto a massive absorber that is then thermally linked to a separately fabricated TES chip via an Au wirebond, providing large electron-phonon coupling (i.e. high signal bandwidth), ease of fabrication, and cosmogenic background suppression. Interestingly, this design strategy is fully compatible with the use of hygroscopic crystals (NaI) as absorbers. An 80-mm diameter Si light detector based upon these design principles, with potential use in both dark matter and neutrinoless double beta decay, has an estimated baseline energy resolution of 0.35 eV, 20$\times$ better than currently achievable. A 1.75 kg ZnMoO${}_4$ large-mass calorimeter would have a 3.5 eV baseline resolution, 1000$\times$ better than currently achieved with NTDs with an estimated position dependence $\frac{\Delta E}{E}$ of 6$\times$10${}^{-4}$. Such minimal position dependence is made possible by forcing the sensor bandwidth to be much smaller than the signal bandwidth. Further, intrinsic event timing resolution is estimated to be $\sim$170 $\mu$s for 3 MeV recoils in the phonon detector, satisfying the event-rate requirements of large $Q_{\beta \beta }$ next-generation neutrinoless double beta decay experiments. Quiescent bias power for both of these designs is found to be significantly larger than parasitic power loads achieved in the SPICA/SAFARI infrared bolometers.

16 pages, 12 figures

Cited by in corpus (10)

• Searching for low-mass dark matter particles with a massive Ge bolometer operated above-ground
• Detecting Superlight Dark Matter with Fermi-Degenerate Materials
• Detection of Light Dark Matter With Optical Phonons in Polar Materials
• Absorption of light dark matter in semiconductors
• A Path to the Direct Detection of sub-GeV Dark Matter Using Calorimetric Readout of a Superfluid ${}^4$He Target
• Dark Matter Absorption via Electronic Excitations
• Characterizing TES Power Noise for Future Single Optical-Phonon and Infrared-Photon Detectors
• First measurements of remoTES cryogenic calorimeters: easy-to-fabricate particle detectors for a wide choice of target materials
• Transition Edge Sensor Chip Design of Modular CEνNS Detector for the Ricochet Experiment
• Opening the low-background and high-spectral-resolution domain with the ATHENA large X-ray observatory: Development of the Cryogenic AntiCoincidence Detector for the X-ray Integral Field Unit