Author: Chen, Y.-J.
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WEPLE09 Mitigation of Nonlinear Phase Space in a Space-Charge-Limited Injector Diode 905
  • W.D. Stem, Y.-J. Chen, J. Ellsworth
    LLNL, Livermore, California, USA
  Funding: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
The performance of an accelerator is limited by the quality of the beam produced at the injector. For a Pierce-type diode structure, the cathode-shroud interface and the anode pipe entrance are sources for undesired, irreversible phase space nonlinearities that lead to emittance growth. In this contribution, we present ways to mitigate these nonlinearities by adjusting the cathode-shroud interface to meet the beam edge boundary conditions and by adjusting the solenoidal focusing magnet in the diode region such that the nonlinear focusing magnetic fringe fields compensate the nonlinear defocusing electrical fields of the anode pipe entrance.
DOI • reference for this paper ※  
About • paper received ※ 05 September 2019       paper accepted ※ 04 December 2019       issue date ※ 08 October 2019  
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Multi-Pulse Scorpius Linear Induction Accelerator for Flash X-Ray Radiography  
  • N. Pogue, Y.-J. Chen
    LLNL, Livermore, California, USA
  • M.T. Crawford, D.J. Funk
    LANL, Los Alamos, New Mexico, USA
  The Scorpius electron linear induction accelerator is currently being developed for NNSA stockpile stewardship’s Enhanced Capabilities for Subcritical Experiments (ECSE) Program. The purpose is to provide multiple x-ray pulses for flash radiography of large hydrodynamic experiments driven by high explosive. The Scorpius accelerator is designed to produce four 90-ns, 2-kA, 20-MeV electron pulses with the inter-pulse separation varying from 100 ns to 900 ns. The exiting electron pulses will be focused onto a high-Z target to produce the needed radiographic x-ray sources. The ECSE Scorpius project is managed at Los Alamos National Laboratory with cooperation from Lawrence Livermore National Laboratory, Sandia National Laboratory and Nevada National Security Site. Currently, the project completion date is set for 2024. This presentation will cover Scorpius accelerator’s development status.  
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