Transport of intense light ion beams

Article Abstract:

Theoretical and laboratory research regarding two techniques for transporting intense light ion beams is described. One technique radially confines and guides the beam by using the magnetic field associated with a wall-stabilized z-discharge. The second technique uses the magnetic field from a central current-carrying wire. The pinch-reflex ion diode on the Naval Research Laboratory Gamble II generator generates and weakly focuses the ion beam onto the aperture of the transport system. For both techniques, high-efficiency transport of beams has been demonstrated for distances of a few meters. Particle transport efficiencies as high as 80 percent for the wire-guided technique and 100 percent for the z-discharge technique were observed.

Electromagnetic fields, Product introduction, New Technique

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Production and investigation of TW proton beams from an annular diode using strong radial magnetic insulation fields and a performed anode plasma source

Article Abstract:

A magnetically insulated proton diode in extraction geometry that has achieved an ion production efficiency exceeding 90 percent and an ion beam power of 0.8 TW is described. The scheme avoids some of the drawbacks of flashover sources and delivers the plasma before any voltage travels across the accelerating gap. In the scheme, ion current and diode voltage attain a plateau of 40 nanoseconds (ns), resulting in a nearly constant diode impedance for 60 nanoseconds that minimizes chromatic aberrations of the diode focusing system. The microscopic divergence of proton beamlets resulting from diode effects is estimated to be 0.7 degrees. Geometrical aberrations of aspherical and spherical anode shape are also discussed.

Diodes, Magnetic fields

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