研究目的
Investigating the effects of a magnetic field on the focusing and acceleration of ions produced by ns laser-generated plasmas.
研究成果
The application of a longitudinal magnetic field in front of the laser-irradiated target produces electron traps, increasing the ion acceleration electrical field. This leads to a significant increase in ion yield and energy, especially for heavier ions. The results are promising for the development of laser ion sources with high energy and current using repetitive laser pulses.
研究不足
The study is limited by the intensity of the magnetic field applied (up to 0.3 Tesla) and the laser intensity (about 10^10 W/cm^2). The effects on heavier ions require very intense and spatially long fields.
1：Experimental Design and Method Selection:
The study involved irradiating solid targets in vacuum with an ns-laser pulse to produce non-equilibrium plasma. The ions emitted were focused and accelerated using cylindrical permanent magnets. The effects were quantified using time-of-flight measurements.
2：Sample Selection and Data Sources:
Thin sheets of polyethylene, glassy carbon, and aluminum were irradiated under the same experimental conditions. The emitted ions were detected with and without the presence of magnetic fields.
3：List of Experimental Equipment and Materials:
A Nd:YAG laser, Ion Collector (IC), Gaussmeter (Hirst GM08), fast storage oscilloscope (Tektronix TDS5104B), and COMSOL Multiphysics software were used.
4：Experimental Procedures and Operational Workflow:
The laser irradiated the targets at an angle of 45°, and the emitted ions were detected along the normal to the target surface. The magnetic field's effect on ion yield and energy was measured and compared with theoretical simulations.
5：Data Analysis Methods:
The energy of the detected particles was calculated using the time-of-flight approach. The experimental results were compared with theoretical calculations obtained using COMSOL Multiphysics software.
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