[en] This book contains the following topics: The LEP project, Superconducting RF cavities for accelerator application, Commissioning of super-ACO, Pulsed high-power beams, RF Power sources, Astrid, A storage ring for ions and electrons, Linear collider studies in Europe

[en] This paper considers the analysis of a guided plasma wakefield accelerator. It is shown by analytical and graphic resolution that the wakewave is propagative and that its phase velocity is greater than the light velocity. An expression of the potentials describing this system is also given; it appears that although the longitudinal wake field intensity is decaying, the transform ratio is still the same, so that the acceleration gradient is the one predicted by the infinite PWFA theory. The authors also notice that the focalization is enhanced, especially for small bunches

[en] This paper reports on the MIT Bates Linear Accelerator Center which is in the process of constructing an electron storage ring. The 190 m ring will be used for internal target experiments with stored beams. It will also be used as a pulse stretcher to provide external beams with high duty factor. The present design incorporates a low beta region with a beta-x of 1 m and a 4.5 m space between ring quadrupoles at the internal target location. The ring will contain up to 80 mA using two turn injection. Extraction using one-half integer resonance will produce up to 50μA with a duty factor over 80%. Injection will occur at 1 kHz. Design extracted beam properties include an energy spread of 0.04% and emittance as low as 0.01 π mm-mr

[en] RFQ1, a 600 keV, 75 mA proton RFQ is the major component of a research program at Chalk River Nuclear Laboratories (CRNL) to study high-current 100% duty factor accelerator systems and develop improved accelerator technology. The mechanical assembly and rf tuning of the RFQ were completed late in 1987, giving fields that were uniform quadrant-to-quadrant and end-to-end to better than 5%. Details of the assembly and tuning will be given in this paper, and the current status of the facility, including high power pulsed and cw rf conditioning and beam experiments with the 50 keV dc injector and RFQ, will be described

[en] This paper reports on the accelerator facility VICKSI (Van-de-Graaff Isochron Cyclotron Kombination fur Schwere Ionen) at the Hahn-Meitner-Institut in Berlin which is a combination of either one of two electrostatic injectors, a 6 MV single ended Van-de-Graaff or an 8 MV tandem, with a fourfold symmetry separated sector isochronous cyclotron. VICKSI can accelerate ions with masses ranging from 1 to about 130. For fully stripped ions (up to mass 30) energies of up to 32 MeV/nucleon are available, decreasing to 4 MeV/nucleon for ions with mass 100. VICKSI has been in routine operation with the Van-de-Graaff injector since 1979. In 1986 the tandem became operational as a second injector. The whole system is computer controlled. The beam quality is excellent: the relative energy width is better than 5 x 10^-4, the pulse length is shorter than 1 ns and the minimal beamspot size with full intensity is 0.5 x 0.5 mm² at the target. The annual operation time is about 7000 h. About 35% of the available beamtime for experiments are used by guest groups from Germany and Central Europe, 10% of the beamtime are taken for beam development, and the rest is used by in house groups for fundamental research in the atomic-, nuclear-, and solid state physics fields

[en] This paper reports on the superconducting 130 MeV electron accelerator at Darmstadt modified for FEL experiments. The FEL project is planned with an electron beam in an energy range from 35 to 50 MeV corresponding to wavelengths from 4.9 to 2.4 μm. The planned FEL setup, a high current injection, the design of a hybrid undulator and the results of simulations of the FEL are presented

[en] This paper reports on the Trapp facility based on a 300 MeV proton synchrotron with two operation modes. The tomography mode serves for making a density map of a patient in the tumour plane by proton tomography. The irradiation mode allows a proton irradiation of targets of any size located in an arbitrary site of the human body. In the first variant a patient is sitting in an armchair with a vertical axis of rotation. An extracted beam can scan in a horizontal plant. For the tomography mode slow extraction of the beam is used. The integrated density of the patient in a given direction is determined from the energies at the body input and output. The time planned for one tomogram is 3-5 minutes. In the irradiation mode both the Bragg peak and punch-through can be used. In both operation modes the proton energy is varied by the variation of the synchrotron energy. Use of tomograms allows the computer control of the irradiation process

[en] One feature of the CERN Large Hadron Collider is the possibility for some experiments to work at luminosities about an order of magnitude higher than the design value of 10³³ cm^-2 s^-1. Special low beta insertions have to be designed for this purpose, which will provide a value of the beta-functions at the interaction point, smaller than the nominal value of 1 m. Limitations arise from geometrical and optical constraints, from chromatic aberations and multipole error tolerances in the superconducting dipoles and quadrupoles and from the dynamic aperture requirements. In this paper, realistic designs are proposed and limiting factors are analyzed by computer simulation

[en] In this paper, the authors report on a 1 mA cw H^- beam from the TRIUMF cusp source to study space charge neutralization at 12 keV as a function of the pressure of the background H₂ gas. At 10^-6 Torr the neutralization level was found to be 96% with a time constant of 80 μs. At 10^-4 Torr there is possibly slight overcompensation (100.7% ± 0.4%) and the time constant was found to be 4μs. The authors discuss these results and explain them qualitatively

[en] This paper reports on axial magnetic fields in ion sources which cause an enhancement of the emittances in the transverse phase planes. Ion beams started from a source without axial magnetic field will show emittance enhancement when entering axially into the magnetic field of a cyclotron. However in both cases there exists a strong coupling between the two phase planes. These phenomena will be treated analytically. It is shown that the correlation may be cured by special devices in the beam handling system or by the specific inflection-system. For an ECR source the emittance can be drastically reduced in one phase plane by more than an order of magnitude while in the other phase plane the emittance enhances by a factor 2. The 4-dimensional emittance is then again determined by the transverse ion temperature and the size of the hole. The hyperbolic inflection is taken as a main example. A few remarks are made about the mirror inflector