Emittance growth in the DARHT Axis-II Downstream Transport

Ekdahl, Jr., Carl August¹  Schulze, Martin E.¹ 

[1] Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

关键词: ELECTRON BEAMS;    BEAM FOCUSING MAGNETS;    BEAM TRANSPORT;    BEAM CURRENTS;    ACCURACY;    DISTRIBUTION;    COMPUTERIZED SIMULATION;    BEAM EMITTANCE;    BEAM PROFILES;    IMAGES;    HYDRODYNAMICS;    CHEMICAL EXPLOSIONS;   

DOI  :  10.2172/1177995
RP-ID  :  LA-UR--15-22706
PID  :  OSTI ID: 1177995
Others  :  TRN: US1500379

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

Using a particle-in-cell (PIC) code, we investigated the possibilities for emittance growth through the quadrupole magnets of the system used to transport the high-current electron beam from an induction accelerator to the bremsstrahlung converter target used for flash radiography. We found that even highly mismatched beams exhibited little emittance growth (< 6%), which we attribute to softening of their initial hard edge current distributions. We also used this PIC code to evaluate the accuracy of emittance measurements using a solenoid focal scan following the quadrupole magnets. If the beam is round after the solenoids, the simulations indicate that the measurement is highly accurate, but it is substantially inaccurate for elliptical beams