LASER-PLASMA ION GENERATOR WITH ACTIVE SYSTEM OF ELECTROSTATIC BEAM FOCUSING Russian patent published in 2019 - IPC H01J37/08 

FIELD: physics.

SUBSTANCE: invention relates to laser-plasma ion generator with active system of beam electrostatic focusing. Generator includes a laser, light radiation of which, reaching the target, forms a plasma drifting in the transit channel towards the ion-optical system (IOS). Current and time parameters of the plasma are measured using a current sensor. Current sensor is electrically connected to the input of the electric voltage amplifier and is installed at the output of the span channel in front of the IOS, which extracts ions from the plasma, formation and acceleration of ion beam and characterized by constant in time value of electric voltages on electrodes. Periodic system of different-potential diaphragms is installed at the output of the IOS, consisting of five diaphragms of the same thickness with apertures in the centre. First, the third and the fifth diaphragms, considering from the IOS output, are electrically connected to a separate source of power supply and are equipotential. Second diaphragm due to the IOS output is electrically connected to the linearly varying electric voltage generator, which is electrically connected to the laser and the current sensor, the fourth diaphragm is electrically connected to the output of the electric voltage amplifier, the input of which is connected to this current sensor.

EFFECT: technical result is the possibility of differentially performing dynamic focusing of the ion beam extracted from the laser plasma in different gaps between its diaphragms, compensating for the dynamics of angular divergence in the beam caused by instability in time of the position of the plasma emission boundary of the ions relative to the electrodes of the IOS, without increasing the temperature of the ions in the plasma and the effective emittance of the ion beam.

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