[en] The 600 MeV synchrocyclotron (SC) was the first accelerator designed, built and operated by CERN, in operation from 1957 until 1990. In 2010, after 20 years of radioactive decay, it was decided - rather than undertaking a complete decommissioning - to convert the building into a Visit Point, leaving the accelerator in place. The 'SC project' started with a preliminary phase that achieved a full radiological characterisation of the vault, and in 3 operational phases: 1) the radiological clean up and decommissioning of all obsolete equipment and material, 2) the refurbishment of the building and 3) the design and installation of a visitors' area with a multi-media exhibition. The new SC Visit Point was inaugurated on 19. June 2014 as part of the celebrations of CERN 60. anniversary, and named Historic Site by the European Physical Society. (author)

[en] The CERN synchrocylotron (K = 800) is currently enjoying a phase of intense exploitation following the rather slow build-up after the reconstruction programme of 1974-1975. After a great deal of rebuilding and improvements the rotating condensers are both now able to operate at full repetition rate with a dee voltage of 20 kV, producing an internal beam of more than 7 μA of 600 MeV protons, of which up to 5 μA has been extracted. Recently, an interest in particles other than protons has developed, and it was found that certain ions could be accelerated by making relatively minor modifications to the machine. ₃He₂⁺ ions of 303 MeV/N have been used since 1978 and there have been several runs with ₃He⁺, ₁₂C₄⁺ and ₁₅N₅⁺ ions since then. These ions have an energy of 86 MeV/N and are produced at very high intensities. Construction work is under way on a modification to the RF system to enable the acceleration of other ions, for example ₂₀Ne₆⁺ and ₂₀Ne₅⁺, for which ion source tests have already given encouraging results

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[en] The UA1 experiment for investigations on proton-antiproton interactions has a detection unit comprising a cylindrical drift chamber, an electromagnetic calorimeter, a hadronic calorimeter and additional drift chambers for the muon detection. Especially with the em calorimeter the interference from nearby power circuits exceeded the specified level. The task for the author was to reduce the interference to an acceptable level without major infringement into the existing electronics. The causes and propagation paths of interferences were found out and simulated in the laboratory. An improvement strategy was derived consisting mainly in changes of the grounding configuration, the periferies of the electronics proper, and only to a small degree on the experiment electronics itself. The author developed a new current supply system featuring the same modularity as the detector itself enabling a nearly complete guard-shield configuration for the 12 channels of the same cable. The signal-to-noise ratio could be improved by 40 in the most afflicted channels. 44 refs., 32 figs., 5 tabs. (qui)

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[en] After a short introduction on the proposed CERN Large Hadron Collider (LHC) and its size in terms of magnets and cryogenics, the main features of the preliminary design of the required 8 to 10 Tesla superconducting magnets are described in some detail. Some general aspects of the R and D program for the magnets, which has been recently started in close collaboration with European Laboratories and Industries are presented. A brief account of the initial steps in the program and of the present state is also given

[en] The performance of the ISOLDE facility at CERN is summarized and recently achieved target/ion-source and separator improvements are presented. New ion source principles being tested include multistep laser ionization, bunched surface ionization, and ECR ion source. The prospects for the high-resolution separator ISOLDE-3 are described. The possibilities of a new ISOLDE installation at the PS Booster at CERN are presented together with the planned features of the new facility. Add-on devices to improve the performance that are presently being discussed are an electrostatic sector field, an electron beam ion stripper, and a high voltage platform for energy boosting. (author) 7 refs.; 5 figs

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[en] The recent developments of target systems for production of high intensity radioactive ion-beams at the ISOLDE mass separators is described. Methods for chemically selective production through separation of molecular ions are outlined and the effects of the addition of reactive gases has been studied. Results and further possible applications in the light element region are discussed. (author) 10 refs.; 9 figs.; 1 tab