Author: Pichoff, N.
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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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THPMR014 Core-halo Limits and Beam Halo-formation Dynamic 3417
  • M. Valette, P.A.P. Nghiem
    CEA/IRFU, Gif-sur-Yvette, France
  • N. Pichoff
    CEA/DSM/IRFU, France
  In high intensity linear accelerators, space charge related instabilities and effects are the cause of emittance increase and beam losses. The mechanism of halo formation due to a mismatched beam causing parametric resonances and energy transfer between phase-spaces is one of them. The previously defined one dimensional core-halo limit [1][2] was extended to two dimensional distributions [3][4]. This halo characterization method is applied to a classical case of transport for halo formation studies: the transport of a mismatched beam. Our method provides a core-halo limit that matches the expected halo formation mechanism with a very good precision.
* Appl. Phys. Lett. 104, 074109 (2014)
** Phys. Plasmas, 22, 083115, (2015)
*** IPAC (2015) MOPWA010
**** TBP
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR014  
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MOPOY053 The SARAF-LINAC Project Status 971
  • N. Pichoff, N. Bazin, L. Boudjaoui, P. Brédy, D. Chirpaz-Cerbat, R. Cubizolles, B. Dalena, G. Ferrand, B. Gastineau, P. Gastinel, P. Girardot, F. Gougnaud, P. Hardy, M. Jacquemet, F. Leseigneur, C. Madec, N. Misiara, P.A.P. Nghiem, D. Uriot
    CEA/IRFU, Gif-sur-Yvette, France
  • P. Bertrand, M. Di Giacomo, R. Ferdinand, J.-M. Lagniel, J.F. Leyge, M. Michel
    GANIL, Caen, France
  SNRC and CEA collaborate to the upgrade of the SARAF accelerator to 5 mA CW 40 MeV deuteron and proton beams (Phase 2). CEA is in charge of the design, construction and commissioning of the superconducting linac (SARAF-LINAC Project). This paper presents to the accelerator community the status at March 2016 of the SARAF-LINAC Project.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY053  
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WEPMB003 Design of the HWR Cavities for SARAF 2119
  • G. Ferrand, L. Boudjaoui, D. Chirpaz-Cerbat, P. Hardy, F. Leseigneur, C. Madec, N. Misiara, N. Pichoff
    CEA/IRFU, Gif-sur-Yvette, France
  CEA is committed to delivering a Medium Energy Beam Transfer line and a superconducting linac (SCL) for SARAF accelerator in order to accelerate 5mA beam of either protons from 1.3 MeV to 35 MeV or deuterons from 2.6 MeV to 40 MeV. The SCL consists in 4 cryomodules. The first two identical cryomodules host 6 half-wave resonator (HWR) low beta cavities (β = 0.09) at 176 MHz. The last two identical cryomodule will host 7 HWR high-beta cavities (β = 0.18) at 176 MHz. Low-beta and high beta cavities have been optimized to limit electric and magnetic peak fields in the cavity, and to minimize the dissipated power. Manufacturing constraints and helium cooling were taken into consideration to minimize the risk during manufacturing and operation. Preliminary mechanical studies of the cavity and of the tuning system, as well as preliminary studies of the couplers and pick-up antennas were carried out. This work will be presented in this poster.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB003  
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