Author: Chauvin, N.
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MOPOR032 Using of the MENT Method for Reconstruction of 2D Particle Distributions in IFMIF Accelerators 668
  • P.A.P. Nghiem, N. Chauvin, L. Ducrot, M. Valette
    CEA/DSM/IRFU, France
  Beam particles are characterized by their coordinates in real spaces or phase spaces that are at least two-dimensional. It is often necessary to reconstruct such a 2D-distribution from the knowledge of only its projections on some axes, either for making use of tomography measurement results or for setting up an input beam for transport simulations. In this article, the use of the MENT (Maximum Entropy) reconstruction method is reported for the IFMIF accelerators where high intensity beam distributions are far from Gaussian ones.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR032  
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WEPMY033 Intermediate Commissioning Results of the 70 mA/50 keV H+ and 140 mA/100 keV D+ ECR Injector of IFMIF/LIPAC 2625
  • B. Bolzon, N. Chauvin, S. Chel, R. Gobin, F. Harrault, F. Senée, M. Valette
    CEA/DSM/IRFU, France
  • J.M. Ayala, J. Knaster, A. Marqueta, K. Nishiyama, Y. Okumura, M. Perez, G. Pruneri, F. Scantamburlo
    IFMIF/EVEDA, Rokkasho, Japan
  • P.-Y. Beauvais, H. Dzitko, D. Gex, G. Phillips
    F4E, Germany
  • L. Bellan
    Univ. degli Studi di Padova, Padova, Italy
  • L. Bellan, M. Comunian, E. Fagotti, F. Grespan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • P. Cara, R. Heidinger
    Fusion for Energy, Garching, Germany
  • R. Ichimiya, A. Ihara, Y. Ikeda, A. Kasugai, T. Kikuchi, T. Kitano, M. Komata, K. Kondo, S. Maebara, S. O'hira, M. Sugimoto, H. Takahashi, H. Usami
    JAEA, Aomori, Japan
  • K. Sakamoto
    QST, Aomori, Japan
  • K. Shinto
    Japan Atomic Energy Agency (JAEA), International Fusion Energy Research Center (IFERC), Rokkasho, Kamikita, Aomori, Japan
  The LIPAc accelerator aims to operate 125 mA/CW deuteron beam at 9 MeV to validate IFMIF's accelerators that will operate in CW 125 mA at 40 MeV. The different subsystems of LIPAc have been designed and constructed mainly by European labs and are being installed and commissioned in Rokkasho Fusion Center. The 2.45 GHz ECR injector developed by CEA-Saclay is designed to deliver 140 mA/100 keV CW D+ beam with 99% gas fraction ratio. Its LEBT presents a dual solenoid focusing system to transport and match the beam into the RFQ. Its commissioning continues in 2016 in parallel with the RFQ installation. The normalized RMS emittance at the RFQ injection cone is to be within 0.25π mm·mrad to allow 96% transmission through the 9.81 m long RFQ. In order to avoid activation during commissioning, an equal perveance H+ beam of half current and half energy as nominal with deuterons is used. In this article, the commissioning results with 110 mA/100 keV D+ beam and 55 mA/50 keV H+ beam are first reported.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY033  
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THYA01 Advanced Concepts and Methods for Very High Intensity Linacs 3155
  • P.A.P. Nghiem, N. Chauvin, D. Uriot
    CEA/DSM/IRFU, France
  • M. Comunian
    INFN/LNL, Legnaro (PD), Italy
  • C. Oliver
    CIEMAT, Madrid, Spain
  • W. Simeoni
    IF-UFRGS, Porto Alegre, Brazil
  • M. Valette
    CERN, Geneva, Switzerland
  For very high intensity linacs, both beam power and space charge should be taken into consideration for any analysis of accelerators aiming at comparing their performances and pointing out the challenging sections. As high beam power is an issue from the lowest energy, careful and exhaustive beam loss predictions have to be done. High space charge implies lattice compactness making the implementation of beam diagnostics very problematic, so a clear strategy for beam diagnostic has to be defined. Beam halo becomes no longer negligible, and it plays a significant role in the particle loss process. Therefore, beam optimization must take the halo into account and beam characterization must be able to describe the halo part in addition to the core one. This presentation discusses advanced concepts and methods for beam analysis, beam loss prediction, beam optimization, beam diagnostic and beam characterization especially dedicated to very high intensity accelerators.  
slides icon Slides THYA01 [6.177 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THYA01  
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WEPOY033 Space Charge Compensation in Low Energy Beam Lines 3055
SUPSS065   use link to see paper's listing under its alternate paper code  
  • F. Gérardin, N. Chauvin, D. Uriot
    CEA/IRFU, Gif-sur-Yvette, France
  • M.A. Baylac, D. Bondoux, F. Bouly
    LPSC, Grenoble Cedex, France
  • A. Chancé, O. Napoly, N. Pichoff
    CEA/DSM/IRFU, France
  The dynamics of a high intensity beam with low energy is governed by its space-charge forces which may be responsible of emittance growth and halo formation due to their non-linearity. In a low energy beam transport (LEBT) line of a linear accelerator, the propagation of a charged beam with low energy causes the production of secondary particles created by the interaction between the beam and the background gas present in the accelerator tube. This phenomenon called space-charge compensation is difficult to characterize analitically. In order to obtain some quantitative to characterize the space-charge compensation (or neutralization), numerical simulations using a 3D PIC code have been implemented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY033  
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