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Time Dependent Beam Focusing at the DARHT-II Injector Diode.


DE2005837224

Publication Date 2005
Personal Author Bylon, S.; Hernestorza, E.; Fawley, W.; Yu, S.
Page Count 8
Abstract The injector for the second axis of the Dual-Axis Radiographic Hydrotest Facility (DARHT) is being designed and constructed at LBNL. The injector consists of a single gap diode extracting 2(micro)s, 2kA, 3.2 MeV electron beam from a 6.5 inches diameter thermionic dispenser cathode. The injector is powered through a ceramic column by a Marx generator. We also investigated the possibility of extracting a beam current of 4 kA. The focusing system for the electron beam consists of a Pierce electrostatic focusing electrode at the cathode and three solenoidal focusing magnets positioned between the anode and induction accelerator input. The off-energy components (beam-head) during the 400 ns energy rise time are overfocused, leading to beam envelope mismatch and growth resulting in the possibility of beam hitting the accelerator tube walls. The anode focusing magnets can be tuned to avoid the beam spill in the 2kA case. To allow beam-head control for the 4kA case we are considering the introduction of time-varying magnetic focusing field along the accelerator axis generated by a single-loop solenoid magnet positioned in the anode beam tube. We will present the beam-head dynamics calculations as well as the solenoid design and preliminary feasibility test results.
Keywords
  • Particle accelerators
  • Injectors
  • Anodes
  • Beam currents
  • Cathodes
  • Ceramics
  • Design
  • Electrodes
  • Electron beams
  • Electrostatics
  • Focusing
  • Induction
  • Magnets
  • Time dependent beam focusing
Source Agency
  • Technical Information Center Oak Ridge Tennessee
Corporate Authors Lawrence Berkeley National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes Sponsored by Department of Energy, Washington, DC.
Document Type Technical Report
NTIS Issue Number 200518
Time Dependent Beam Focusing at the DARHT-II Injector Diode.
Time Dependent Beam Focusing at the DARHT-II Injector Diode.
DE2005837224

  • Particle accelerators
  • Injectors
  • Anodes
  • Beam currents
  • Cathodes
  • Ceramics
  • Design
  • Electrodes
  • Electron beams
  • Electrostatics
  • Focusing
  • Induction
  • Magnets
  • Time dependent beam focusing
  • Technical Information Center Oak Ridge Tennessee
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