Author: Maglioni, C.
Paper Title Page
MOPPD081 Upgrade of the LHC Beam Dumping Protection Elements 556
  • W.J.M. Weterings, T. Antonakakis, B. Balhan, J. Borburgh, B. Goddard, C. Maglioni, R. Versaci
    CERN, Geneva, Switzerland
  The Beam Dumping System for the Large Hadron Collider comprises for each ring a set of horizontally deflecting extraction kicker magnets, vertically deflecting steel septa, dilution kickers and finally, a couple of hundred meters further downstream, an absorber block. A mobile diluter (TCDQ) protects the superconducting quadrupole immediately downstream of the extraction as well as the arc at injection energy and the triplet aperture at top energy from bunches with small impact parameters, in case of a beam dump that is not synchronized with the particle free gap or a spontaneous firing of the extraction kickers. Simulations have shown that an asynchronous dump of a 7 TeV nominal beam into the TCDQ absorber blocks could damage it. This paper describes the proposed changes to this device in order to maintain the protection for the downstream elements while reducing the risk of damaging the TCDQ in case of such a beam loss.  
TUPPR053 Conceptual Design of the Linac4 Main Dump 1939
  • I.V. Leitao, C. Maglioni, A. Sarrió Martínez
    CERN, Geneva, Switzerland
  Linac4 is the new CERN linear accelerator intended to replace the aging Linac2 as the injector to the Proton Synchrotron Booster (PSB) for increasing the luminosity of the Large Hadrons Collider (LHC). By delivering a 160MeV H beam, Linac4 will provide the necessary conditions to double the brightness and intensity of the beam extracted from the PSB. This paper describes the conceptual design of the Linac4 Main Dump, where two different concepts relying respectively on water and air cooling were compared and evaluated. Based on the application of analytical models for the energy deposited by the beam, heat conduction and cooling concepts, a parametric study was performed. This approach allowed the identification of the “optimal” configuration for these two conceptual geometries and their relative comparison. Besides giving the theoretical guidelines for the design of the new dump, this work also contributes to the development of analytical tools to allow a better understanding of the influence of the several design parameters in this type of low-energy beam intercepting devices.  
TUPPR054 Internal H0/H Dump for the Proton Synchrotron Booster Injection at CERN 1942
  • M. Delonca, C. Maglioni, A.A. Patapenka, A. Sarrió Martínez
    CERN, Geneva, Switzerland
  In the frame of the LHC Injectors Upgrade Project at CERN (LIU), the new 160MeV H Linac4 will inject into the four existing PS Booster rings after the conversion of H into H+ in a stripping foil. Given a limited stripping efficiency and possible foil failures, a certain percentage of the beam is foreseen to remain partially (H0) or completely (H) unstripped. An internal dump installed into the chicane magnet to stop these unstripped beams is therefore required. This paper presents the conceptual design of the internal dump, reviewing loading assumptions, design constraints, limitations and integration studies. Power evacuation through the thermal contact between the core and the external active cooling is addressed and, finally, results from the numerical thermo-mechanical analyses are reported.  
THPPP015 A Clamped Be Window for the Dump of the HiRadMat Experiment at CERN 3758
  • M. Delonca, T. Antonakakis, D. Grenier, C. Maglioni, A. Sarrió Martínez
    CERN, Geneva, Switzerland
  At CERN, the High Radiation to Materials facility (HiRadMat) is designed to test accelerator components under the impact of high-intensity pulsed beams and will start operation in 2012. In this frame a LHC TED -type dump was installed at the end of the line, working in nitrogen over-pressure, and a 258μm-thick beryllium window was placed as barrier between the inside of the dump and the external atmosphere. Because of the special loading conditions, a clamped window design was especially developed, optimized and implemented, the more standard welded window not being suitable for such loads. Considering then the clamping force and the applied differential pressures, the stresses on the window components were carefully evaluated thanks to empirical as well as numerical models, to guarantee the structural integrity of the beryllium foil. This paper reports on choices and optimizations that led to the final design, presenting also comparative results from different solutions and the detailed results for the adopted one.  
THPPP016 Upgrade Strategies for the Proton Synchrotron Booster Dump at CERN 3761
  • A. Sarrió Martínez, F. Loprete, C. Maglioni
    CERN, Geneva, Switzerland
  CERN’s LHC Injection chain Upgrade (LIU) involves a revision of the Proton Synchrotron Booster dump, which was designed in the 1960’s to cope with beam energies reaching 800 MeV and intensities of 10+13 particles per pulse. Thermo-mechanical studies highlighted the need for an upgrade of the dump, so that it is capable of withstanding energies in the order of 2 GeV and intensities up to 10+14 particles per pulse. This paper proposes a new design of the dump in the light of various constraints and choices such as the geometry, materials and the integration of the required cooling system. Further topics discussed include the strategy for dismantling the old device, which has been continuously irradiated for almost 40 years and presents a difficult access. Therefore, a detailed ALARA procedure is being prepared in order to carry out the upgrade works in the area.