[en] The main goal of the meeting is to present and discuss the current status of the SPIRAL2 project at GANIL in front of a large community of scientists and engineers. The program of the meeting will include presentations on scientific and technical developments related to the baseline project, experiments and theory. The main topics to be discussed at the conference have been: -) Driver Accelerators, -) Production of radioactive ion beams (RIB), -) Safety, -) RIB Facilities Worldwide (FAIR, Riken Nishina Center, SPES project, FRIB project) -) FP7 SPIRAL2 Preparatory Phase, -) Experiments with RIB and Theory. This document is made up of the slides of the presentations

[en] Loading characteristics of coaxial electrostatic lens consisting of two coaxial cylinders and an edge diaphragm with a circular slit were calculated. Dependence of image position on the position of the object (hollow-beam) was calculated according to the program for electrostatic electron-optical systems with rotating symmetry. A simple empirical formula for beam central trajectory radius was obtained on the basis of numerical calculations. It was shown that for coaxial electrostatic lens with hollow beam focusing on the axis the classical formula of lens (Newton formula) was used

[en] Movement of charged particles in linearly polarized EH-ubitron field featuring sinusoidal dependence of magnetic field alternating component on time is studied. It is shown that, depending on the system parameters and initial conditions of a particle flying into EH field area, three different characters of movement are possible: flight movement, capture in the vicinity of one of magnetic field maxima and particle spattering out of EH field area. Analytical expressions for criterion defining particles movement character, as well as analytical solutions for the particle energy in the approximation of a slow change in the magnetic field amplitude in time, are found. Specific features of particles movement in EH fields with are arbitrary rate of magnetic field amplitude change in time are studied numerically

[en] A phenomenological model of electron flow with a virtual cathode in diode space, which is a modification of cellular automation, is suggested. The type of models, called cellular conveyer, permits making allowance for distribution and delay in a beam with a virtual cathode. A good agreement between results of numerical study of electron flow dynamics and results obtained using the phenomenological model described has been achieved

[en] The perspectives of developing the experimental accelerator-driven neutron generator being made in ITEP are discussed. The ITEP ADS neutron generator consists of the target-blanket assembly and the linear proton accelerator Istra-36. It is projected to introduce superconducting sections in the composition of the neutron generator linac-driven. The application of superconducting resonators allows to increase the particle energy up to 53 MeV at the average beam current 500 μA. The variants of raising the average current up to 5 mA by increasing the HF-system power are considered. The application of magnetohard materials permits to decrease the cost of the bend magnet and its dimensions. To improve the radiation situation it is proposed to use the graphite absorbers of particles

[en] Numerical calculations for the Spallation Neutron Source accumulator ring indicate that lattice resonances excited by the space-charge potential can increase a mismatch significantly by deforming the beam distribution in phase space. Hence increased mismatch leads to enhanced envelope oscillations that are driving the 2:1 parametric resonance leading to halo formation, even for initially matched beams. We have observed this behavior for the 2ν_x-2ν_y=0 resonance and for the 4ν_y=23 resonance. This mechanism for halo formation peculiar to rings through resonance driven mismatch is very sensitive to the tunes, which emphasizes the importance of a careful choice of operating point in tune space. (c) 1999 The American Physical Society

[en] Since the move of ISOLDE from CERN's synchrocyclotron (SC) to the Proton Synchrotron Booster (PSB) in 1992 extensive work has been devoted to the development of new beams, i.e. the production of new isotopes, beams of higher intensity and the ionization of further elements. Most of these developments were driven by the particular needs of the physics community proposing new experiments. The main achievements were the adaption of liquid metal targets to the pulsed proton beam to prevent shockwaves and splashing inside the target container and systematic studies on the time structure of the release of the isotopes from the target. Furthermore the work on laser ion-sources already started at ISOLDE-2 was continued, the so-called RIST target was developed, and most recently first tests on the isotope production while increasing the proton energy from 1 GeV to 1.4 GeV were done. The latter topics are discussed in this paper

[en] The Free Electron Laser at Jefferson Lab is based on a photo-injected energy recovered linac, and currently uses a 40 MeV electron beam with an average current of 5 mA. The electron bunches are extremely short with FWHM values that are in the few hundred femtosecond regime. These electron bunches pass a chicane around the optical cavity, and therefore emit synchrotron radiation. In the far-IR region, the wavelength of light being emitted quickly approaches that of the electron bunch length, giving rise to multiparticle coherent enhancement. The result is a broadband spectrum more than 5 orders of magnitude brighter than can be obtained from incoherent synchrotron IR sources. We will discuss preliminary measurements of this radiation, and applications to spectroscopy and imaging

[en] We have produced and measured for the first time second harmonic oscillation in the infrared region by the high average power Jefferson Lab Infrared Free Electron Laser. Although such lasing is ideally forbidden, since gain is zero on axis for a perfect electron beam in an infinite wiggler, the finite geometry and beam emittance allows sufficient gain for lasing to occur. We were able to lase at pulse rates up to 74.85 MHz and could produce over 4.5 watts average and 40 kW peak of IR power in a 40 nm FWHM bandwidth at 2925 nm. In agreement with predictions, the source preferentially lased in a TEM01 mode. We present results of initial source performance measurements and comparisons of gain as calculated by different approaches

[en] This paper addresses the evolution, design, analysis and development of a novel approach for stopping the proton beam at a 7.5 MeV power level. During commissioning of the Spallation Neutron Source (SNS) injector, the first Drift Tube Linac (DTL) tank will be installed, and in the place of the second DTL tank a diagnostic plate assembly will be inserted and the beam thoroughly tested. The beam will be tested at full power (36 mA, 1ms, 60 Hz), so a beam stop is being designed to handle the thermal and structural stresses and minimize neutron production. The beam stop is assumed to be a cone configuration with radius of 10 cm base and slope of 3.5 cm/cm. It will be made of Nickel 200, 2 mm thick