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To cope with the future large demand on neutron-transmutation-doped germanium of (NTD) sensors, our groups in LUMINEU started a new production line for NTD-Ge. This paper contains details on the NTD-Ge production, resistance measurement and a comparison of the performance in terms of noise and signal-to-noise ratio with an existing sensor contacts. This demonstrates our ability to produce NTD sensors for the desired range of working temperature. [ABSTRACT FROM AUTHOR]

One of the goals of LUMINEU is to develop NTD-Ge sensors for various applications. The steps are to produce NTD-Ge sensors first, then to study the dependence of their performance on the production parameters, and finally to optimize their electric contacts. In this paper, we present the different possibilities for estimating and measuring the real neutron fluence received by each Ge wafer irradiated in a thermal neutron reactor. Measurements of their resistivity at 300 K indicate a fluence discrepancy from the expected value and confirm the homogeneity of the doping throughout the volume. In addition, we present a method allowing an improved estimation of the impedance below 30 mK just by measuring the ratio of the NTDs' resistivity at 77 and 4 K. [ABSTRACT FROM AUTHOR]

We report on the superconducting properties of amorphous NbSi thin films. The normal-state resistance and critical temperatures can be separately adjusted to suit the desired application. Notably, the relatively low electron-phonon coupling of these films makes them good candidates for an 'all electron bolometer' for Cosmological Microwave Background radiation detection. Moreover, this device can be made to suit both high and low impedance readouts. [ABSTRACT FROM AUTHOR]