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Mouillet, M.

Paper Title Page
WEPCH107 Contributors to AIRIX Focal Spot Size 2164
 
  • N. Pichoff, M. Caron, F. Cartier, D.C. Collignon, A. Compant La Fontaine, G. Grandpierre, L.H. Hourdin, M. Mouillet, D.P. Paradis
    CEA, Pontfaverger-Moronvilliers
 
  High intensity electron beam focusing is a key issue for the successful development of flash radiography at hydro test facilities. AIRIX is a 2 kA, 19 MeV, 60 ns, single shot linear accelerator that produces X-rays from the interaction between relativistic electrons and a Tantalum solid target (Ta). A simulation tool has been developed to model the pulsed-beam dynamics through the accelerator from the cathode to the target. This simulator has allowed to estimate the contribution to the beam size on the target (focal spot) of beam emittance, pulse energy dispersion, pulse rising and falling fronts and the ion production on the target. The quantified contributions of these phenomena are reviewed here.  
THPCH003 Influence of Beam-Breakup Instabilities on Electron Focusing 0
 
  • M. Caron, F. Cartier, D.C. Collignon, L.H. Hourdin, M. Mouillet, D.P. Paradis, N. Pichoff
    CEA, Bruyères-le-Châtel
 
  High intensity electron beam focusing is a key issue for the successful development of flash radiography at hydro test facilities. AIRIX is a 2 kA, 19 MeV, 60 ns, single shot linear accelerator that produces X-rays from the interaction between relativistic electrons and a Tantalum solid target (Ta). In that emittance dominated process, different physical mechanisms can limit the end focusing of the intense electron beam on Ta. In the present paper, the role of the beam break-up (BBU) instabilities is pointed out. The theory of BBU for induction linacs has been developed for quite some time. For an accelerating beam with steady state radial oscillations at the accelerator entrance, the theoretical prediction regarding the amplitude growth after n successive cavities agrees with the experimental observations. Therefore, as a result of the subsequent emittance growth a spot size enlargement would be expected. As a matter of fact, we found out experimentally that no direct correlation can be drawn up between BBU growth and focal spot dimensions over the range of transverse beam motion investigated. This finding gives now new orientations on the way to reduce the spot size.