A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Tang, Y.

Paper Title Page
THPAN082 Implementation of Spread Mass Model of Ion Hose Instability in Lamda 3408
 
  • Y. Tang
    ATK-MR, Albuquerque, New Mexico
  • C. Ekdahl
    LANL, Los Alamos, New Mexico
  • T. C. Genoni, T. P. Hughes
    Voss Scientific, Albuquerque, New Mexico
  • M. E. Schulze
    SAIC, Los Alamos, New Mexico
  
  Funding: Work supported by Los Alamos National Laboratory.

The ion-hose instability sets limits on the allowable vacuum in the DARHT-2 linear induction accelerator (2kA, 18.6MeV, 2μs). Lamda is a transport code which advances the beam centroid and envelope in a linear induction accelerator from the injector to the final focus region. The code computes the effect of magnet misalignments, beam breakup instability, image-displacement instability, and gap voltage fluctuation on the beam. In this work, we have implemented the Spread Mass (SM) model of ion-hose instability into Lamda so that we can examine quickly the operating parameters for the experiments. Unlike the ordinary SM ion-hose code which assumes the uniform axial magnetic field, Lamda ion-hose calculation includes varying axial magnetic field, accelerating beam, gas pressure file, varying beam radius and elliptical beam. The benchmarks against a semi-analytical SM code and the particle-in-cell code Lsp, and a prediction of ion-hose instability for a 2.5MeV-1.4kA beam in the DARHT-2 are presented.