研究目的
Investigating the generation and measurement of laser-driven magnetic fields in coil targets using continuous wave Faraday rotation diagnostics.
研究成果
The study demonstrated that laser-driven magnetic fields in coil targets can be effectively measured using continuous wave Faraday rotation diagnostics. A 30-times increase in laser intensity by reducing the pulse duration from 2.8 ns to 70 ps resulted in a twofold increase in the magnetic field and current. The relaxation time of the magnetic pulse was on the sub-microsecond scale.
研究不足
The study was limited to laser energies of about 25 J and two specific pulse durations. The electromagnetic noise during the short pulse shots was higher, affecting the signal clarity. The model used does not account for all physical effects, such as space charge and heating of the coil material.
1：Experimental Design and Method Selection:
The study utilized a Multi-Terawatt Laser (MTW) to generate magnetic fields in coil targets with two pulse durations (2.8 ns and 70 ps). The axial magnetic field was measured using continuous wave Faraday rotation diagnostics.
2：8 ns and 70 ps). The axial magnetic field was measured using continuous wave Faraday rotation diagnostics.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Coil targets made of Cu101 foil with a 99.99% purity and 0.1 mm thickness were used. The internal diameter of the coil was 1 mm.
3：99% purity and 1 mm thickness were used. The internal diameter of the coil was 1 mm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The MTW laser, Faraday glass disk, Glan polarizer, silicon photodiode, oscilloscope, and interference filter were used.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused on the capacitor plate of the target. The Faraday rotation of a CW laser beam at 405 nm was measured in a Tb doped glass disk to determine the magnetic field.
5：Data Analysis Methods:
The magnetic field was calculated from the Faraday rotation angle using the Verdet constant. The current in the coil was reconstructed from the magnetic field measurements.
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