[en] The chosen design concepts and technical approaches as described in the Heavy Ion Driver Ignition Facility (HIDIF) study are compared with the present status of accelerator technologies and the experiences gained in the operation of the heavy ion accelerator facilities at GSI. Novel advanced technologies, as developed e.g. for the FAIR Project, may be used for a more compact and realistic driver layout. Major differences between a single shot and a high repetition rate facility will be discussed

[en] Funneling is a method to increase the brightness of ion beams by filling all rf-buckets in order to use the full current transport capability of an rf accelerator by frequency jumps at higher energies. This has been proposed for HIIF type drivers and neutron sources. A simple funneling experiment is prepared at Frankfurt, using modest fields in a set up with a 50 keV proton beam and an rf deflector to study especially emittance growth effects in such funneling lines. First results will be reported

[en] Funneling two or more beams together is a way of increasing the brightness of ion beams by filling all rf-buckets of an rf-accelerator. Thus higher current transport capability results at higher energies and operating frequencies. It can be used to reduce the cost and complexity of accelerators designed to produce intense beams with high brightness. Results of numerical simulations and funneling experiments are reported, where a setup with a 50-keV proton beam and an rf deflector is investigated to study emittance growth effects in funneling lines. (R.P.) 13 refs.; 9 figs.; 1 tab

[en] Funneling is a way of increasing the brightness of ion beams by filling all buckets of a rf-accelerator and using the higher current transport capability at higher energies. Funnel systems have been proposed, e.g. for HIIF type drivers and spallation neutron sources. Results of numerical simulations and funneling experiments at Frankfurt are reported, where a setup with a 50 keV proton beam and a rf deflector is investigated to study especially emittance growth effects in funneling lines. (Author) 9 figs., tab., 13 refs

No abstract available

[en] The contribution of the Karlsruhe Institut fur Experimentelle Kernphysik to the r.f. particle separator at the SPS/CERN consists of the two superconducting deflectors and their He II-cryostats with the cryogenic and vacuum accessories. The cryostats have to fulfill specifications concerning tightness, thermal insulation, adjustment of the cavities to the beam and reliability. Corresponding cryogenic and r.f. tests are performed in Karlsruhe before a 300 W refrigerator simulating normal and emergency conditions. Following a description of cryostat design the results of these measurements are compared with the specifications. Operating experience with the cryostats in closed circuit with the refrigerator are reported. The effects of disturbances on the separated He II-baths of the cryostats and the means to control them are treated. (author)

[en] Radio Frequency Quadrupole (RFQ) structures are well suited to accelerate all kinds of ions at low particle energies with high transmission efficiency even at high beam currents. Like other rf-accelerators they normally have a fixed velocity profile and corresponding fixed input and output energies per nucleon of the accelerated ions. But - due to the strong transverse focusing - the RFQ-accelerators can also capture and transport very efficiently ions with energies and specific charge states even far away from the design values. Results of calculations will be presented and compared to measurements

[en] For the FAIR project the present GSI accelerator complex, consisting of the heavy ion high current linac UNILAC and the synchrotron SIS 18, is foreseen to serve as an injector for up to 10¹²U²⁸⁺ particles/s. Different hardware measures and careful fine tuning in all sections of the UNILAC resulted in an increase of the beam intensity to 10¹¹U²⁸⁺ ions or 2x10¹⁰U⁷³⁺ -ions per 100 μs. Further upgrade measures are described

[en] The intensity upgrading program for the GSI accelerator facility comprises major modifications of the UNILAC for its operation as a high current injector into the heavy-ion synchrotron SIS. This paper focuses on space charge effects arising in the stripper section at 1.4 MeV/u between a new 36 MHz preaccelerator (under construction) and the existing Alvarez structures. In this section the charge states of incoming ions, having a mass-to-charge ratio of A/q ≤ 65, are increased by stripping in a nitrogen jet to allow further acceleration at A/q ≤ 8.5. The anticipated high current beam of e.g. 4 pmA uranium will experience considerable space charge forces, most severely after the charge state jump in the stripper (from 4⁺ to an average charge state of 28⁺ for uranium). The associated emittance growth has been studied for the present transport section, it was found to depend strongly on the underlaying particle density distribution. The amount of 'useful' beam remaining within given emittance limits will be discussed. (author)

[en] Transport experiments have been performed in RFQ structures with unmodulated electrodes for the study of beam optics and space charge effects. Beam dynamic calculations show, that the transport of ions is also possible in RFQ accelerators with modulated electrodes without major losses of beam quality as long as the ion velocity is outside of the longitudinal acceptance given by the velocity profile of the structure. Results from calculations and first measurements are presented and discussed. One possible application is the variation of end energy in a modular RFQ accelerator. (author) 13 refs.; 7 figs