A novel experimental system for the KDK measurement of the 40^{40}K decay scheme relevant for rare event searches

Potassium-40 ($^{40}$K) is a long-lived, naturally occurring radioactive isotope. The decay products are prominent backgrounds for many rare event searches, including those involving NaI-based scintillators. $^{40}$K also plays a role in geochronological dating techniques. The branching ratio of the electron capture directly to the ground state of argon-40 has never been measured, which can cause difficulty in interpreting certain results or can lead to lack of precision depending on the field and analysis technique. The KDK (Potassium (K) Decay (DK)) collaboration is measuring this decay. A composite method has a silicon drift detector with an enriched, thermally deposited $^{40}$K source inside the Modular Total Absorption Spectrometer. This setup has been characterized in terms of energy calibration, gamma tagging efficiency, live time and false negatives and positives. A complementary, homogeneous, method is also discussed; it employs a KSr$_2$I$_5$:Eu scintillator as source and detector.Comment: 20 pages, 24 figures, Submitted to NIM

Acquisizione dei dati sperimentali nell'impianto "condensazione"

Report del Dipartiment

Prove sperimentali sul deflusso bifase in una giunzione a T

PT DE 580/I

TIMES regional and sectoral models

The Lame MOdelling TEAM is developing TIMES applications with detailed characterisation of Reference Energy Systems, mainly focused on local(Piemonte Region) and sectoral (Italian electrical energy supply, transmission and demand) system

TIMES regional and sectoral models

The Lame MOdelling TEAM is developing TIMES applications with detailed characterisation of Reference Energy Systems, mainly focused on local(Piemonte Region) and sectoral (Italian electrical energy supply, transmission and demand) systems

Design, Analysis and Realisation of a Magnetic Gear Prototype with Experimental Validation

Since years '80s of last century magnetic gears have been considered as possible power transmission systems, in substitution of classical mechanical transmissions. They are able to transmit torque, between two mechanical axes, in a contactless way, through the interaction of two coaxial permanent magnets rotors with a set of ferromagnetic poles. Several advantages can be achieved from the physical isolation between moving parts, as the absence of lubrication, no mechanical fatigue, the reduction of noise, wearing and need of maintenance, as well as the integrated overload protection function. A test bench for experimental analysis of the magneto-mechanical performance and the dynamics of a magnetic gear prototype has been devised, designed and realised. Magnetic gears have been equipped with pick-up coils to measure the magnetic flux waveforms in order to compare them with simulation analyses. Details about the test bench, its drives and controls and experimental results obtained by tests are presented and discussed