Proceedings

Synchronization scheme of three terminal MTJ devices

This work deals with a micromagnetic model able to characterize nanoscale oscillators based on three terminal magnetic tunnel junctions. The effect of the spin-transfer torque and the spinorbit torque are taken into account. Our results predict that the possibility to couple spintronics to spin-orbitronics, and specifically to separate electrically those two torque sources, A scalable synchronization scheme based on the parallel connection of those three terminal devices is proposed.

Hybrid time synchronization for Underwater Sensor Networks

Time synchronization is an important part of distributed applications over a sensor network. In this work we investigate time synchronization problems over a shallow UWSN, taking into account all main communication challenges of the water channel and observing its behavior in simulation and real tests. It is proposed an hybrid frame based time synchronization using both, LFM and OFDM communication with channel impulse response equalization. Simulation results show how Hybrid synchronization outperforms existing synchronization protocols and how these results are affected in real water tests.

The Boltzmann constant from the shape of a H2 18O vibration-rotation line

We report on the recent determination of the Boltzmann constant, kB, by means of Doppler broadening thermometry, performed at the Second University of Naples, providing complementary information, as compared to previous papers. This relatively new method of primary gas thermometry was implemented by using a pair of offset-frequency locked extended-cavity diode lasers at 1.39 m, to probe a particular vibration-rotation transition of the H2 18O molecule. Adopting a rather sophisticated and extremely refined line shape model in the spectral analysis procedure, we were able to determine the...

Beam Diagnostics by Infrared Time Resolved Detectors

Last generation storage rings, both light sources and colliders, needs many different diagnostic systems to achieve specification goals. Many commercially available diagnostics are used to measure real-time accelerators performance. Nevertheless going towards higher luminosities or lower emittance, diagnostics need to be always more sophisticated. At DAFNE, the LNF e+/e- F-factory, colliding at 1.02 GeV energy in c.m., efforts are carrying on to achieve higher luminosities for the KLOE detector. Given that a ~20-25% discrepancy has been measured between the extrapolated 10 bunches peak...

Emulsion Cloud Chamber Technology to measure the Fragmentation of Carbon Ion Beams used in Hadron Therapy

The use of Carbon ion beams in hadron therapy has become more and more used in recent years. Carbon ions present some advantages when compared to traditional radiotherapy, such as the dose-depth deposition that makes possible to reach critical anatomical sites and the biological effectiveness. The knowledge of the light fragments production yield and their angular distribution has a key role in the estimation of the dose profile in hadron therapy. We present a detector based on nuclear emulsions for fragmentation measurements that performs a submicrometric tridimensional spatial resolution,...

The ATLAS Insertable B-Layer (IBL) design, production and integration challenges

For Run-2 of the LHC a fourth, innermost Pixel Detector layer on a smaller radius beam pipe has been installed in the ATLAS Detector to add redundancy against radiation damage of the current Pixel Detector and to ensure a high quality tracking and b-tagging performance of the Inner Detector over the coming years until the High Luminosity Upgrade. To improve the overall physics performance of the ATLAS detector, a local support structure in carbon fiber has been developed with an overall planarity of 350μm, targeting for a low material budget subdetector with a total radiation length of only...

Establishing C3, the Coherence between Accelerator Physics Requirements, Magnet Manufacture, and Magnetic Measurements

In mathematics, C3 denotes a 3-times continuos differentiable function. We use this as shorthand for establishing the coherence between beam physics simulations and machine requirement, magnet design and manufacture, and magnetic measurements. Magnetic field measurements primarily serve for for the quality assurance of the magnet production, both at an early stage in the production process and after the reception of the magnets in the laboratory. Measurements are also performed for validating numerical field simulation (FEM) tools and magnet design techniques. In order to study the...

An example of employment of static and dynamic monitoring to understand the behaviour of a flexible retaining wall

Analysis and design of flexible retaining walls under seismic actions is required in many applications, but is not fully established yet due to the involved complex soil-wall interaction mechanisms. Technology for advanced field measurements and integration with refined numerical analyses represent an attractive option to shade light on this relevant topic of seismic geotechnics. In the present paper, experimental measurements both dynamic and static recorded on a full-scale retaining wall are briefly discussed. Their relevance in view of the development of an effective soil-structure...

Advanced measurements on cantilever retaining wall models during earthquake simulations

Evaluation of a bi-layered soil deposit dynamic properties and behavior by means of accelerometric measures

The definition of a suitable geotechnical model is a primary task in performing site response analyses. Soil mechanical properties should be carefully estimated and soil profile inhomogeneities should be taken into account to obtain appropriate results. In this paper the dynamic response of a bilayer soil profile is investigated by means of 1-g shaking table tests. A back-analysis procedure to estimate the mechanical parameters and the inhomogeneity rating of the soil profile, by means of accelerometric measures, is presented. The dynamic response of the geotechnical model obtained is...