22 research outputs found
Il nuovo Piano Regolatore del Porto di Genova: metodo e processo
The drafting of the new Port Master Plan (PRP) of Genoa spans across both a comparison with the approach adopted by the PRP in force (2001) and an analysis of trends in the maritime industry that requires planning on a large scale in a bid to meet the future challenges posed by the advent of the new behemoth container ships.
The guidelines of the new PRP (2012) identify five main objectives: integration in the national logistics network, increased competitiveness, productivity growth, environmental sustainability, added-value to the regional and local area.
Within this framework, public discussions chaired by the Port Authority with the port stakeholders has given rise to strategic guidelines, including a wider port turning basin which received broad consensus.
The new PRP will be designed as a \u201cstructural plan\u201d, flexible in its implementation phase and promoter of new technologies and best practices in support of the development policies of the port
Schema di Linee guida per la conservazione delle architetture di interesse archeologico: conoscenza, prevenzione e manutenzione
Pulsed production of antihydrogen
Antihydrogen atoms with K or sub-K temperature are a powerful tool to precisely probe the validity of fundamental physics laws and the design of highly sensitive experiments needs antihydrogen with controllable and well defined conditions. We present here experimental results on the production of antihydrogen in a pulsed mode in which the time when 90% of the atoms are produced is known with an uncertainty of ~250 ns. The pulsed source is generated by the charge-exchange reaction between Rydberg positronium atoms\u2014produced via the injection of a pulsed positron beam into a nanochanneled Si target, and excited by laser pulses\u2014and antiprotons, trapped, cooled and manipulated in electromagnetic traps. The pulsed production enables the control of the antihydrogen temperature, the tunability of the Rydberg states, their de-excitation by pulsed lasers and the manipulation through electric field gradients. The production of pulsed antihydrogen is a major landmark in the AEgIS experiment to perform direct measurements of the validity of the Weak Equivalence Principle for antimatter
Compression of a mixed antiproton and electron non-neutral plasma to high densities
We describe a multi-step ârotating wallâ compression of a mixed cold antiprotonâelectron
non-neutral plasma in a 4.46 T PenningâMalmberg trap developed in the context of the AEÂŻgIS experiment
at CERN. Such traps are routinely used for the preparation of cold antiprotons suitable for antihydrogen
production. A tenfold antiproton radius compression has been achieved, with a minimum antiproton radius
of only 0.17 mm. We describe the experimental conditions necessary to perform such a compression: minimizing the tails of the electron density distribution is paramount to ensure that the antiproton density
distribution follows that of the electrons. Such electron density tails are remnants of rotating wall compression and in many cases can remain unnoticed. We observe that the compression dynamics for a pure
electron plasma behaves the same way as that of a mixed antiproton and electron plasma. Thanks to this
optimized compression method and the high single shot antiproton catching efficiency, we observe for the
first time cold and dense non-neutral antiproton plasmas with particle densities n â„ 1013 mâ3
, which pave the way for an efficient pulsed antihydrogen production in AEÂŻgIS
Towards the first measurement of matter-antimatter gravitational interaction
The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment with the central aim to measure directly the gravitational acceleration of antihydrogen. Antihydrogen atoms will be produced via charge exchange reactions which will consist of Rydberg-excited positronium atoms sent to cooled antiprotons within an electromagnetic trap. The resulting Rydberg antihydrogen atoms will then be horizontally accelerated by an electric field gradient (Stark effect), they will then pass through a moiré deflectometer. The vertical deflection caused by the Earth's gravitational field will test for the first time the Weak Equivalence Principle for antimatter. Detection will be undertaken via a position sensitive detector. Around 103 antihydrogen atoms are needed for the gravitational measurement to be completed. The present status, current achievements and results will be presented, with special attention toward the laser excitation of positronium (Ps) to the n=3 state and the production of Ps atoms in the transmission geometry
Imaging a positronium cloud in a 1 Tesla
We report on recent developments in positronium work in the frame of antihydrogen production through charge exchange in the AEgIS collaboration [1]. In particular, we present a new technique based on spatially imaging a cloud of positronium by collecting the positrons emitted by photoionization. This background free diagnostic proves to be highly efficient and opens up new opportunities for spectroscopy on antimatter, control and laser manipulation of positronium clouds as well as Doppler velocimetry
Imaging a positronium cloud in a 1 Tesla
We report on recent developments in positronium work in the frame of antihydrogen production through charge exchange in the AEgIS collaboration [1]. In particular, we present a new technique based on spatially imaging a cloud of positronium by collecting the positrons emitted by photoionization. This background free diagnostic proves to be highly efficient and opens up new opportunities for spectroscopy on antimatter, control and laser manipulation of positronium clouds as well as Doppler velocimetry
Gravity and antimatter: The AEgIS experiment at CERN
From the experimental point of view, very little is known about the gravitational interaction between matter and antimatter. In particular, the Weak Equivalence Principle, which is of paramount importance for the General Relativity, has not yet been directly probed with antimatter. The main goal of the AEgIS experiment at CERN is to perform a direct measurement of the gravitational force on antimatter. The idea is to measure the vertical displacement of a beam of cold antihydrogen atoms, traveling in the gravitational field of the Earth, by the means of a moiré deflectometer. An overview of the physics goals of the experiment, of its apparatus and of the first results is presented
Monte-Carlo simulation of positronium laser excitation and anti-hydrogen formation via charge exchange
The AEgIS experiment aims at producing antihydrogen (and eventually measuring the effects of the Earth gravitational field on it) with a method based on the charge exchange reaction between antiproton and Rydberg positronium. To be precise,antiprotons are delivered by the CERN Antiproton Decelerator (AD) and are trapped in a multi-ring Penning trap, while positronium is produced by a nanoporous silica target and is excited to Rydberg states by means of a two steps laser excitation. New Monte Carlo simulations are presented in this paper in order to investigate the current status of the AEgIS experiment [1] and to interpret the recently collected data [2]