Author: Marroncle, J.
Paper Title Page
WEOC04 Space Charge Effects Studies for the ESS Cold Linac Beam Profiler 371
 
  • F. Belloni, F. Benedetti, G. Coulloux
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  • P. Abbon, F. Gougnaud, C. Lahonde-Hamdoun, P. Le Bourlout, Y. Mariette, J. Marroncle, J.-Ph. Mols, V. Nadot, L. Scola
    CEA/DSM/IRFU, Grenoble, France
  • C.A. Thomas
    ESS, Lund, Sweden
 
  Five Ionization Profile Monitors are being built by CEA in the framework of the in-kind contribution agreement signed with ESS. The IPMs will be installed in the Cold Linac where the proton energy range they need to cover extends from 90 MeV to 2 GeV. The ESS fields intensity of 1.10+09 protons/bunch delivered at a frequency of 352 or 704 MHz, with a duty cycle of 4%, may strongly affect the trajectories of the ionized molecules and electrons created by the passage of the beam through the residual gas. In order to quantify and to develop a correction algorithm for these space charge effects, a code was initiated at ESS and completed at CEA Saclay with the possibility to include real case electric fields calculated with Comsol Multiphysics. A general overview of the code and its preliminary results are presented here.  
slides icon Slides WEOC04 [5.186 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC04  
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TUPA02 A Micromegas Based Neutron Detector for the ESS Beam Loss Monitoring 211
 
  • L. Segui, D. Desforge, F. Gougnaud, T.J. Joannem, C. Lahonde-Hamdoun, Ph. Legou, J. Marroncle, V. Nadot, T. Papaevangelou, G. Tsiledakis
    CEA/IRFU, Gif-sur-Yvette, France
  • H. Alves, S. Aune, J. Beltramelli, Q. Bertrand, T. Bey, M. Combet, M. Kebbiri, P. Le Bourlout, O. Maillard
    IRFU, CEA, University Paris-Saclay, Gif-sur-Yvette, France
  • I. Dolenc Kittelmann, T.J. Shea
    ESS, Lund, Sweden
  • Y. Mariette
    CEA/DSM/IRFU, France
 
  Beam loss monitors are of high importance in high-intensity hadron facilities where any energy loss can produce damage or/and activation of materials. A new type of neutron BLM have been developed for hadron accelerators aiming to cover the low energy part. In this region typical BLMs based on charged particle detection are not appropriate because the expected particle fields will be dominated by neutrons and photons. Moreover, the photon background due to the RF cavities can produce false beam loss signals. The BLM proposed is based on gaseous Micromegas detectors, designed to be sensitive to fast neutrons and insensitive to photons (X and gamma). In addition, the detectors will be insensitive to thermal neutrons, since part of them will not be directly correlated to beam loss location. The appropriate configuration of the Micromegas operating conditions will allow excellent timing, intrinsic photon background suppression and individual neutron counting, extending thus the dynamic range to very low particle fluxes. The concept of the detectors and the first results from tests in several facilities will be presented. Moreover, their use in the nBLM ESS system will be also discussed  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA02  
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