[en] One possible element for funneling two beams together is a deflector with a constant or time-varying electric-field strength. With such an element, arbitrary beams can be brought together and maintained on the axis, if the appropriate combination of deflector parameters is chosen. A parallel beam can be handled only with a time-varying voltage of the deflector. The six-dimensional transfer matrices are calculated for constant or time-varying fields; all the results are correct in first-order approximation

[en] Light cone coordinates and field-field anticommutators for the free quark model on the light cone are introduced and light cone charges and light cone currents for the free quark model as well as sum rules for the meson and quark states are derived. The derivation of sum rules for the baryons is attempted. It is seen that it is possible formally to derive the same sum rules for the baryons and for the quarks. The baryon sums were derived through the symmetry properties of the baryon fields. Explicit assumptions about the spatial distribution of the three quarks in the baryons were not utilized. The meson-baryon Σ-terms, Zweig's rules in the SU (4) and a number of properties of the M-matrix are discussed. (BJ)

[en] The funneling of heavy ion beams can be achieved by first bending the beams by septum magnets towards the common axis, and then deflecting them onto the axis by rf-deflector elements with time varying electric field strength. The main properties of these deflection elements are discussed. Formulaes are given for calculating the maximal allowed length of any transition section, if the longitudinal phase width should stay below an upper limit. These limits are important for a heavy ion beam funneling section. As an example, beam envelopes are shown for funneling two 100 mA, 1.7 MeV/N Bi⁺² beams into one 108 MHz Alvarez accelerator

[en] For a high intensity bunched beam the longitudinal acceptance usually is smaller than the beam emittance at injection energy. This causes longitudinal particle loss and emittance increase. A model is presented which explains the dynamics of the trapping procedure and the related particle loss for a high current bunched beam. The model is in qualitative agreement with numerical results obtained from multiparticle calculations. By varying the injection energy and the phase of the bunch center and the matching parameters of the beam the trapping efficiency can be improved

[en] The scope of the European Bi⁺ HIDIF study with its 3 MJ total driver energy was to demonstrate the feasibility of an RF linac and storage based scheme for ignition with an indirectly driven low gain target. More recent upgrade scenarios with at least 4.5 MJ total driver energy are focused on energy production and high gain targets. Keeping the linac beam current constant and increasing instead the number of storage rings from 12 to 18 will give the required 4.5 MJ total driver energy. Aiming for high total driver efficiency was not a topic for the ignition facility, however it is a very crucial item for a heavy ion fusion power plant. All RF linac components should be feasible for up to 50 Hz rep. rate in order to be cost effective for energy production. A total driver efficiency of 20% is only achievable at 50 Hz rep. rate. However, it is preferred to have the 20% driver efficiency at 10 Hz rep. rate, which is expected to be the maximal achievable rep. rate for a single target station. One elegant way to get the wanted 20% driver efficiency at 10 Hz rep. rate with 4.5 MJ total driver energy and 12 storage rings only, is to change the HIDIF layout from single charged Bi⁺ to double charged Bi²⁺ ions. The layout of a cost effective and less complex Bi²⁺ separated section main linac from 10 MeV/n on is outlined. Reduced numbers of large apertures, high gradient external quadrupoles, feasible up to 50 Hz rep. rate are used for focusing the high intensity beam. Monte Carlo simulations for a Bi²⁺ beam with 600 mA particle current are presented, demonstrating the feasibility of such a Bi²⁺ linac as injector for the storage rings. By adding more target stations later on, the full potential of a 50 Hz rep. rate Bi²⁺ fusion power plant can be realized

[en] As a part of the European Hadron Facility (EHF) a 400 MHz drift tube proton linac has been designed. This linac accelerates a peak current of 50 mA from 2 MeV up to 150 MeV. The linac structure has been optimized to give a low power consumption or a short linac length. The beam dynamics in the linac is tested by multiparticle calculations including space charge. A choice of beam parameters is possible which give almost no transverse emittance increase. The longitudinal emittance increases by 20 to 30%

[en] Geometrical misaligned elements cause displacement of the beam center from the ideal accelerator axis and an increase of the beam radius, which are discussed in some detail in the literature. For any quasiperiodic accelerating structure and independent statistical distributed displacement errors of the single elements, a formalism is presented by which both effects can be calculated. The obtained rms radius increase is almost independent of the beam current. The optimal position for steering magnets can easily be determined. As an example, the radius increase is plotted as a function of the beam energy for the SNQ 324 MHz disk-and-washer proton linac. The main effect here is the transverse displacement of a single quadrupole in a doublet. Rotations of quadrupoles about the beam axis and field errors are negligible. With 5 pairs of steering magnets, the shift of the beam center away from the ideal axis is less than 5 mm everywhere

No abstract available

[en] The funneling line of the SNQ-project is described with all its restrictions and components. The line combines two beams, 180⁰ out of phase, produced by identical 100 MHz RFQ's, into one 200 MHz Alvarez accelerator. Special emphasis is given to the beam dynamics of transporting a high current, bunched, unneutralized proton beam of 2 MeV over a length of about 15 m. Results of multiparticle calculations for the funneling line are presented. (orig.)

No abstract available