Collective acceleration of laser produced ions
Abstract
Experimental studies of the collective acceleration
of laser produced ions have been conducted.
An intense relativistic electron beam (1 MeV, 30 kA,
30 ns) is emitted from a 4 mm diameter tungsten
cathode and passes through a 2.4 cm hole in a
stainless steel anode into a 14 cm diameter downstream
drift tube. Ions are provided on the downstream side
of the anode plane by firing a 4-10 J, 15 ns Q-switched
ruby laser pulse at solid or foil targets
mounted on the downstream side of the anode plane.
Accelerated ion energies are measured using time of
flight and range energy/track etching techniques. Ion
charge states are measured using an EIIB Thomson
spectrometer. Results will be compared with
measurements of the pre-acceleration characteristics
of the laser produced ions from these target
geometries obtained using an electrostatic analyzer.
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