NDCX-II injector with a 10.9 cm diameter Li$^{+}$ ion source

ORAL

Abstract

The Neutralized Drift Compression Experiment II (NDCX-II) is an accelerator facility for warm dense matter studies. It will generate a short Li$^{+}$ ion beam pulse ($\sim $ 1 ns) at up to a few MeV ion kinetic energy to uniformly heat thin targets to $\sim $ 1 eV temperature. The NDCX-II induction linac has a 130 kV injector that produces $\sim $ 100 mA, 0.5 $\mu $s ion current from a 10.9 cm diameter lithium alumino-silicate ion source. The fabrication and operation of the ion source is challenging due to the high current density required, the difficulty in coating the large emitter and the high operating temperature of 1275$^{\circ}$C. Required power to heat the source is 3.4 kW and calculated temperature variation across the surface is 9.8$^{\circ}$C. Details of the NDCX-II injector design and initial beam optics will be presented.

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Authors

  • P.K. Roy

    Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA

  • W.G. Greenway

    Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA

  • D.P. Grote

    Lawrence Livermore National Laboratory, LLNL, Lawrence Livermore National Laboratory (LLNL), Livermore, CA

  • J.Y. Jung

    LBNL, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA

  • J.W. Kwan

    Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA

  • P.A. Seidl

    LBNL, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA

  • J. Takakuwa

    LBNL, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA

  • J.L. Vay

    LBNL, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA

  • W.L. Waldron

    LBNL, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA