Linear-induction acceleration of a kiloampere proton beam
Thesis/Dissertation
·
OSTI ID:6609904
The possibility of producing a multi-megavolt, multi-kiloampere proton beam in a linear induction accelerator was investigated in an experiment with two acceleration stages. The injector stage produced a 1-MeV proton beam with a current of 1- to 6 kA and a pulse width of 50 ns. In the second stage, the beam was accelerated by an additional 200 keV. The electron current in the acceleration gaps was suppressed using a radial magnetic field. In an initial magnetic field geometry, the magnetic return flux extended across the beam. As measured by carbon activation, the beam rapidly expanded. This was due to poor neutralization in the region of the return flux. A subsequent field geometry had an axial magnetic field which confined the beam in the drift region, in addition to the radial magnetic field in the diode. An azimuthal gradient in the diode magnetic field caused a decrease in the diode voltage and proton fluence. This decrease can be explained by an instability in the electron sheath. When the azimuthal gradient was reduced, both the diode voltage and proton current increased to their prior levels.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA)
- OSTI ID:
- 6609904
- Country of Publication:
- United States
- Language:
- English
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