[en] GSI plans to build a heavy ion synchrotron, the SIS 12/18, as an extension to its UNILAC facility. This linear accelerator, in operation since 1976, accelerates heavy ions up to 20 GeV/u; SIS will extend this range up to 1 GeV/u for the heaviest ions such as uranium (q/A ca. 0.3) and up to 2 GeV/u for light ions with a specific charge of q/A = 0.5. Acceleration of intense proton beams to 4.5 GeV is being discussed as an option, for the production, for instance, of exotic radionuclides, or for experiments comparing proton interactions with those of ions. In normal operation a magnetic rigidity of 12 Tm can be reached in a fast cycle (dB/dt = 10 T/s, 3 cycles/s). For high energy operation up to 18 Tm, the power supplies are connected to give a peak current of 3500 A at a reduced cycle rate (dB/dt = 4 T/s, 1 cycle/s). The use of triplet focusing at low energy increases machine acceptance. Modulation of the doublet current raises transition energy when accelerating protons to 4.5 GeV. This paper presents and justifies the design and operating parameters

[en] High energy spread caused by the longitudinal size of the beam is well known in wake-field acceleration. Usually this issue can be solved with beam loading effect that allows to keep accelerating field nearly constant, along the whole duration of the beam. In this work, however, we would like to address another source of energy spread that arises at high energy, due to betatron radiation.

[en] The invention relates to linear accelerators. It refers to a linear accelerator comprising an electronic source, an ion-injection device and an accelerating unit, the magnetic field of the latter being gradually decreasing from the inlet to the outlet, so that the ions injected and trapped in the troughs of the thus-formed progressive wave are accelerated up to a velocity nearing that of light

[en] The heavy ion accelerator combination VICKSI being built at the Hahn-Meitner-Institute in Berlin consists of a 6-MV Van de Graaff accelerator as injector into a 4 sector cyclotron with a mass energy product of 100. The primary design goal of this accelerator combination is 200 MeV for carbon to argon ions. The Van de Graaff, including ion source and high voltage terminal, is undergoing major reconstruction. The beam matching and transport system between the two accelerators, comprising a stripper and two bunchers, was designed. The rf system is under test with low power. The new building for the cyclotron is completed, except for interior work. The anticipated date for first beam injection into the cyclotron is November 1976. (auth)

[en] The combination of a Van de Graaff injector and a separated magnet cyclotron VICKSI for heavy ions is nearing completion. All subsystems are functioning, most of them at specifications. Final assembly and debugging are going on now. In a first trial a beam has been injected into the first cyclotron orbit

[en] In 1971 the Bevatron successfully accelerated low-intensity heavy ion beams up to neon to energies of 2.1 GeV/amu. More recently, beams up to argon have been accelerated using the SuperHILAC as an injector to the Bevatron--the Bevalac concept. With increasing scientific interest in high-energy high-intensity beams of heavier ions, plans to upgrade both the Bevatron vacuum system and the SuperHILAC ion sources and injectors have been formulated. A proposed new pre-accelerator based on an air-insulated Cockcroft-Walton and a Wideroe linac is presented. The Wideroe linac uses the design concepts established at UNILAC, modified for frequency and energy requirements. U⁷+ from the ion source is accelerated from 12 keV/amu to 113 keV/amu and stripped to a mean charge state acceptable to the first tank of the SuperHILAC. The expected intensity improvement over the present pressurized injector is a factor of 100 at the highest masses. The physical modeling of the Wideroe linac structure will be kept to a minimum. Computer models predicting the characteristics of the structure have improved to the point where the probability of satisfactory performance is high

[en] Highlights: • Plasma lenses can be used in a powerful new type of adiabatic focusing. • The adiabatic plasma lens may be essential for final focusing in TeV-class linear colliders. • We examine a first experimental test of adiabatic lensing, taking place at SPARC Lab (INFN-LNF). • A unique ramped-density plasma source developed for this experiment is reported. • Diagnosis of the beam focusing to few micron size by using betatron radiation is described. Passive plasma lenses in the underdense regime have been shown to give extremely strong linear focusing, with strength proportional to the local plasma ion density. This technique has been proposed as the basis of a scheme for future linear colliders that mitigates the Oide effect through adiabatic focusing. In this scenario the plasma density in the lens is ramped slowly on the scale of betatron motion, to funnel the beam to its final focus while forgiving chromatic aberrations. We present to the physics design of an adiabatic plasma lens experiment to be performed at SPARC Lab. We illustrate the self-consistent plasma response and associated beam optics for symmetric beams in plasma, simulated by QuickPIC using exponentially rising density profiles. We discuss experimental plans including plasma source development and betatron-radiation-based beam diagnostics.

[en] In the last twenty years we have witnessed a dramatic increase in the demand for accelerator-produced radioisotopes and a corresponding increase in the beam capabilities of the new generations of commercial production cyclotrons. This paper will attempt to trace the changes in the design of external solid target systems for radioisotope production and discuss the many new challenges imposed by pushing the extracted beam currents to one milli-ampere and beyond, especially as applied in the 'MDS Nordion' facility at TRIUMF. (authors)

No abstract available

No abstract available