94 research outputs found
Development of the FAMU experimental apparatus for the proton radius measurement
No full textThe proton, the nucleus of the hydrogen atom, is the building block of the universe and its fascinating internal structure is defined by Quantum Chromo-Dynamics. Our experiment will measure the hyperfine splitting of the muonic hydrogen atom (μp) to study the proton’s internal magnetic structure by laser exciting from singlet μp to the triplet state with an original technique that we have proposed and tested in recent years.
Have had the chance to enter the FAMU (Fisica degli Atomi MUonici) experiment in its final realization phase and I could take part in the development of all aspects of the experiment from the preliminary data taking and the subsequent analysis to the definition of the layout and the development of the laser.
In particular, I took part in the preliminary data collection at ISIS accelerator facility at Rutherford Appleton Laboratory (RAL) in UK. I contributed to the analysis of the data collected by the detectors based on Ce:LaBr3 scintillation crystals with an innovative readout based on SiPM (Silicon Photo-Multiplier), finding useful improvements to perfection the resolution of these detectors. I also analyzed the data collected in the 2016 FAMU data acquisition, improving the knowledge on the argon transfer rate dependence on the temperature and X-rays de-excitation energy spectra. I designed the trigger system and realized the laser data acquisition system.
The major work in which I was involved was on FAMU laser system, which will excite the hyperfine splitting transition, the most crucial part of the experiment. I participated, taking also the responsibility of the laser safety officer a RAL, to the development and characterization of the oscillator and amplifier for the 1.26 μm laser source, which we developed on purpose for our experiment.
The test and qualification of all the non-linear crystals were additional aspects of my work for our laser source, for which I developed the whole laser control program. This program allows to control remotely and in real time every aspect of the laser: from the wavelength to the energy production and the control of the stabilization of the beams through a feedback system developed on purpose.
Hit by the consequences of the COVID-19 pandemic, while continuously improving the laser and experiment layout, we were forced to postpone the data acquisition of the experiment at RAL in September 2022, after the one-year-long maintenance shutdown of the accelerator.The proton, the nucleus of the hydrogen atom, is the building block of the universe and its fascinating internal structure is defined by Quantum Chromo-Dynamics. Our experiment will measure the hyperfine splitting of the muonic hydrogen atom (μp) to study the proton’s internal magnetic structure by laser exciting from singlet μp to the triplet state with an original technique that we have proposed and tested in recent years.
Have had the chance to enter the FAMU (Fisica degli Atomi MUonici) experiment in its final realization phase and I could take part in the development of all aspects of the experiment from the preliminary data taking and the subsequent analysis to the definition of the layout and the development of the laser.
In particular, I took part in the preliminary data collection at ISIS accelerator facility at Rutherford Appleton Laboratory (RAL) in UK. I contributed to the analysis of the data collected by the detectors based on Ce:LaBr3 scintillation crystals with an innovative readout based on SiPM (Silicon Photo-Multiplier), finding useful improvements to perfection the resolution of these detectors. I also analyzed the data collected in the 2016 FAMU data acquisition, improving the knowledge on the argon transfer rate dependence on the temperature and X-rays de-excitation energy spectra. I designed the trigger system and realized the laser data acquisition system.
The major work in which I was involved was on FAMU laser system, which will excite the hyperfine splitting transition, the most crucial part of the experiment. I participated, taking also the responsibility of the laser safety officer a RAL, to the development and characterization of the oscillator and amplifier for the 1.26 μm laser source, which we developed on purpose for our experiment.
The test and qualification of all the non-linear crystals were additional aspects of my work for our laser source, for which I developed the whole laser control program. This program allows to control remotely and in real time every aspect of the laser: from the wavelength to the energy production and the control of the stabilization of the beams through a feedback system developed on purpose.
Hit by the consequences of the COVID-19 pandemic, while continuously improving the laser and experiment layout, we were forced to postpone the data acquisition of the experiment at RAL in September 2022, after the one-year-long maintenance shutdown of the accelerator
A Methodology for UML Models V&V
No full textThe introduction of UML models in the software life cycle poses new issues and challenges that are not adequately supported by current state-of-the-art development tools, especially concerning V&V activities. Indeed, every tool usually focuses on a small set of specialized activities, failing to provide a satisfactory (general purpose) V&V framework.
In this paper we propose a methodology which allows a seamless integration of V&V into a UML-based development environment. The methodology exploits a set of supporting tools designed to be integrated in a unified framework. We believe that such proactive collaboration between tools can reduce significantly both effort and time required to tackle consistency, correctness, quality and long-term maintainability of UML models, increasing the development productivity and the overall quality of the delivered system
FAMU experiment: measurement of the transfer rate from up to oxygen
No full textThe main goal of the FAMU experiment is to measure for the first time the hyperfine splitting of the muonic hydrogen ground state and, through this measurement, to determine the proton Zemach radius. To achieve this result, it is necessary to characterize first the muon transfer mechanism from muonic hydrogen to oxygen. This study has been carried on by the FAMU Collaboration at the RIKEN-RAL muon facility in the UK. In this work the most recent results on this topic are presented
The experimental setup of FAMU to measure the proton Zemach radius
No full textThe FAMU experiment data acquisition is approaching. During September 2022 the full experimental setup is going to measure for the first time the muonic hydrogen ground state hyperfine splitting and obtain a precise measurement of the proton Zemach radius, shedding some new light on the proton radius puzzle. This result will not be possible without a complete system which joins nuclear and laser physics. The FAMU setup is formed by a
gas cryogenic target filled with a mixture of hydrogen and oxygen in which muons injected from the RIKEN-RAL facility (UK) are stopped. The muonic hydrogen produced is then exposed to a tunable infrared laser beam, unique for its energy and narrow linewidth, able to induce the hyperfine energy jump. The transition will be measured as a variation of the muonic transfer rate from hydrogen to oxygen, observed through the detection of the X-rays
emitted during the de-exitation of muonic oxygen. This presentation will describe the final setup which is being installed in all its parts
The optimal hybrid/electric ferry for the liguria Natural Parks
No full textWith this work we want to contribute to the
evaluation of the effectiveness of using an electric/hybrid Ferry
boat for tourist transportation in a real case. For this purpose, it
is necessary to define the “optimal” systems configuration of the
Ferry boat in term of engine power, energy storage and
photovoltaic system sizes and also percentage of hybrid or pure
electric usage. However the adjective “optimal” cannot have an
absolute definition because it strongly depends on the context we
are evaluating the problem and also subjective factors, not easily
quantifiable, enter the evaluation of optimal system. For
example, for a ferry working in marine Natural Parks like those
around La Spezia harbor, operating and initial costs are
important parameters to be considered, but pollution, noise and
comfort are at least as much important ones. Moreover, due to
the constraints given by the battery storage system (volume,
weight, cost and recharge time) the hybrid/electric system of the
ferry must be well targeted at the specific routes and possible
stages in the transport service around the La Spezia Gulf. For
that reason, we focus to the determination of an optimal hybrid
ferryboat, aimed at the specific case of La Spezia.
We think that the analysis here performed can be replicated
to other cases and may be useful in showing the potential of these
new technologies for a more sustainable boating, both from the
environmental and economic point of view, while also improving
the service provided to passengers, especially in terms of comfort
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