95 research outputs found
Family caregivers of people with ALS: a qualitative study on two groups of mutual support.
No full textWhitepaper on the DAEDALUS Program
No full textThis whitepaper describes the status of the DAEdALUS program for development
of high power cyclotrons as of the time of the final meeting of the Division of
Particles and Fields 2013 Community Study ("Snowmass"). We report several new
results, including a measurement capability between 4 and 12 degrees on the CP
violating parameter in the neutrino sector. Past results, including the
capability of the IsoDAR high Dm^2 antielectron neutrino disappearance search,
are reviewed. A discussion of the R&D successes, including construction of a
beamline teststand, and future plans are provided. This text incorporates short
whitepapers written for subgroups in the Intensity Frontier and Frontier
Capabilities Working Groups that are available on the Snowmass website
Time resolved X-ray emission diagnostics in an axis-symmetric simple mirror trap
No full textTime resolved characterization of plasma X-ray emission represents an innovative technique to characterize non-equilibrium phases in Electron Cyclotron Resonance Ion Sources (ECRIS). Indeed, although ECRIS plasmas are usually in dynamical equilibrium, many relevant phenomena are characterized by fast transients and require a dedicated diagnostics to be fully investigated. In particular, time resolved diagnostics can be applied to characterize the X ray emission during the plasma turn on and off and during the turbulence phenomena induced by Cyclotron-Maser instability. This paper presents the experimental set-up used during the last campaign at measurement carried out at the IstitutoNazionale FisicaNucleare-LaboratoriNazionali del Sud (INFN-LNS), together with the main achieved results. Particular relevance will be given to the characterization of the afterglow phase, which highlighted the existence of two electron populations characterized by different mean lifetime. Evidences of X-ray bursts emission in the afterglow phase, compatible with Cyclotron Maser instability, will be also shown. c 2019 IOP Publishing Ltd and Sissa Medialab
A TM01 mode launcher with quadrupole field components cancellation for high brightness applications
No full textThe R&D of high gradient radiofrequency (RF) devices is aimed to develop innovative accelerating structures based on new manufacturing techniques and materials in order to construct devices operating with the highest accelerating gradient. Recent studies have shown a large increase in the maximum sustained RF surface electric fields in copper structures operating at cryogenic temperatures. These novel approaches allow significant performance improvements of RF photoinjectors. Indeed the operation at high surface fields results in considerable increase of electron beam brilliance. This increased brilliance requires high field quality in the RF photoinjector and specifically in its power coupler. In this work we present a novel power coupler for the RF photoinjector. The coupler is a compact X-band TM01 mode launcher with a fourfold symmetry which minimized both the dipole and the quadrupole RF components
A status report of the multipurpose superconducting electron cyclotron resonance ion source
No full textIntense heavy ion beam production with electron cyclotron resonance (ECR) ion sources is a common requirement for many of the accelerators under construction in Europe and elsewhere. An average increase of about one order of magnitude per decade in the performance of ECR ion sources was obtained up to now since the time of pioneering experiment of R. Geller at CEA, Grenoble, and this trend is not deemed to get the saturation at least in the next decade, according to the increased availability of powerful magnets and microwave generators. Electron density above 1013 cm−3 and very high current of multiply charged ions are expected with the use of 28 GHz microwave heating and of an adequate plasma trap, with a B-minimum shape, according to the high B mode concept [S. Gammino and G. Ciavola, Plasma Sources Sci. Technol. 5, 19 (1996)]. The MS-ECRIS ion source has been designed following this concept and its construction is underway at GSI, Darmstadt. The project is the result of the cooperation of nine European institutions with the partial funding of EU through the sixth Framework Programme. The contribution of different institutions has permitted to build in 2006–2007 each component at high level of expertise. The description of the major components will be given in the following with a view on the planning of the assembly and commissioning phase to be carried out in fall 2007. An outline of the experiments to be done with the MS-ECRIS source in the next two years will be presented
Experimental nuclear astrophysics in Italy
No full textNuclear astrophysics, the union of nuclear physics and astronomy, went through an impressive expansion during the last twenty years. This could be achieved thanks to milestone improvements in astronomical observations, cross section measurements, powerful computer simulations and much refined stellar models. Italian groups are giving quite important contributions to every domain of nuclear astrophysics, sometimes being the leaders of worldwide unique experiments. In this paper we will discuss the astrophysical scenarios where nuclear astrophysics plays a key role and we will provide detailed descriptions of the present and future of the experiments on nuclear astrophysics which belong to the scientific programme of INFN (the Italian National Institute for Nuclear Physics)
Diffusion processes in microwave discharge ion source and consequences on the upgrade of existing ion sources
No full textFIRST BEAM FROM THE TRASCO INTENSE PROTON SOURCE (TRIPS) AT INFN-LNS
No full textAbstract The TRASCO intense proton source (TRIPS) has been installed at INFN-LNS THE SOURCE DESIGN The TRASCO Project is a R&D program which goal is the design of an Accelerator Driving System (ADS) for nuclear waste transmutation. The high current cw proton linear accelerator will drive a subcritical system to transmutate nuclear wastes. [1] The accelerator design is shared between different INFN laboratories and the LNS is in charge of the source design and construction. The proton source TRIPS is a high intensity microwave source, which goal is the injection of a minimum proton current of 35 mA in the following RFQ [2], with a rms normalized emittance lower than 0.2π⋅mm⋅mrad for an operating voltage of 80 kV. With respect to other sources for high intensity applications, some new features have been added, according to our experience with the high-intensity source SILHI • the microwave matching system has been improved; • a system to move the coils on-line has been realized; • the extraction system has been optimised with the aim to increase the source availability and reliability, in order to meet the requirement of a driver for an ADS system. The final design of TRIPS is shown in 2 The gaps, the voltage and the extraction holes have been designed in order to reduce the length of the extraction zone (where the beam is uncompensated) and to reduce the aperture-lens effect. Rms normalized emittance below 0.2π mm mrad (including the beam halo) have been calculated EXPERIMENTAL RESULTS CONCLUSION AND FUTURE DEVELOPMENTS In table 1 the status of the source is compared with the requirements of the TRASCO project. The requested reliability at 80 kV is not yet achieved, but the source performance are already good in terms of beam intensity, reproducibility and stability. The innovative solutions presented above have confirmed their validity. We are confident that in a few months a more significant reliability test at 80 3 kV (over two weeks) can be done. As this goal will be accomplished, the emittance measurements can be done with a similar emittance measuring device as the one described in ACKNOWLEDGEMENT
Tradizione e innovazione nel controllo del Philaenus spumarius Linnaeus, 1758 (Hemiptera aphrophoridae)
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