Abstract
We developed transition-edge sensor (TES) microcalorimeters to measure gamma rays with up to a few megaelectron volts. Our TES devices have a thick silicon membrane that supports a large absorber. We fabricated devices with different sizes of the TES and membranes to study the thermal conductance of the membrane. We found that the thermal conductance \(G\) of the membrane is less dependent on the distance between the TES and heat bath because heat is mainly transported by ballistic phonons in the thick membrane. In addition, gamma-ray irradiation experiments were conducted using a TES device with a large bismuth absorber (1 mm × 1 mm × 1 mm) and a thick membrane (6 μm); the energy response of the device was found to be largely linear.
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Acknowledgements
This work was supported by JSPS KAKENHI Grant Number 21H03738.
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Tsuruta, T., Hamamura, Y., Iyomoto, N. et al. Thermal Conductance of Thick-Membrane TES Microcalorimeters for Several-MeV Gamma Rays. J Low Temp Phys 209, 449–456 (2022). https://doi.org/10.1007/s10909-022-02776-y
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DOI: https://doi.org/10.1007/s10909-022-02776-y