研究目的
Investigating plasma dynamics and thermalization in colliding laser-produced plasmas for magnetic reconnection research by observing both electron and ion-features of laser Thomson scattering spectra.
研究成果
The electron density suddenly decreases after the interaction, indicating the plasma ejection from the interaction region by a magnetic reconnection. The electron temperature in the double-flow is higher than that in the single-flow due to the heating by a plasma kinetic energy. The ion temperature is much larger than the electron temperature and this may be interpreted as a collisional effect. This heating may also be explained by a magnetic reconnection: the energy transfer from the magnetic field to thermal and kinetic energy of the plasma.
研究不足
The simultaneous measurements of magnetic field and plasma parameters were missing, making it unclear how much energy of magnetic field is converted to plasmas both in thermal and kinetic energies.
1：Experimental Design and Method Selection:
The experiment was performed at Gekko laser facility, Osaka University. Two laser beams focused on two aluminum foils to generate magnetized plasmas. A magnetic field is spontaneously generated in the laser spot via Biermann battery effect and is advected with expanding plasma. The plasma was diagnosed with collective laser Thomson scattering method using two spectrometers for electron-feature (electron plasma wave: EPW), and for ion-feature (ion acoustic wave: IAW).
2：Sample Selection and Data Sources:
Two aluminum foils were used as targets.
3：List of Experimental Equipment and Materials:
Gekko laser, Nd:YAG laser, spectrometers.
4：Experimental Procedures and Operational Workflow:
A Nd:YAG laser passed through the plasma on the mid-plane. EPW and IAW were measured in different directions. The plasma structure is imaged by observing thermal bremsstrahlung emission from the side of the targets.
5：Data Analysis Methods:
The electron density and temperature are inferred from the electron-feature fitting the Thomson scattered spectrum with a form factor S(k, ω) in the collective regime. Other parameters related to ions, such as ion temperature Ti, charge state Z, and flow velocity vd are obtained by fitting the ion-feature.
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