Abstract
1 Magnetic-field generation in the laboratory
Laboratory generation of strong magnetic fields is of significance to many research fields including plasma and beam physics[
A laser-driven strong magnetic field up to 200 T has been demonstrated on the Shenguang-II (SG-II) laser facility of the National Laboratory on High-Power Lasers and Physics. The basic scheme is to produce strong magnetic fields from the cold electron flow in a laser irradiated open-ended coil[
The experiment layout is shown in Figure
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Wavelength | Method | Magnetic-field strength at the B-dot | Current | |||
---|---|---|---|---|---|---|
(J) | (nm) | ( | (T) | (mA) | (T) | |
536.24 | 351 | B-dot | 0.0065 | 0.044 | 45 | |
1004.27 | 351 | B-dot | 0.011 | 0.071 | 73 | |
1780.4 | 351 | B-dot | 0.16 | 0.10 | 102 | |
1966.8 | 351 | B-dot | 0.031 | 0.20 | 205 |
Table 1. Summary of magnetic-field strength, and current in the coil.
The laser parameters, magnetic-field strength, current and energy conversion efficiency, are all summarized in Table
2 Magnetic reconnection
MR is a universal physical process in plasmas, in which the stored magnetic energy is converted into high-velocity flows and energetic particles[
Figure
Following previous one, another experiment was performed to model the interaction of solar wind with dayside magnetosphere. Figure
Furthermore, we have studied the low beta plasma MR in our recent experiment. This is the first laboratory study of MR with an explicitly controlled magnetic-field environment produced by capacitor-coil target[
3 Spectra of plasma with strong magnetic field related to astrophysical objects
Magnetic fields are widely existed in universe, from the interior of stars to the astrophysical interstellar medium (ISM). For example, in x-ray binaries the magnetic-field strengths of accreting neutron stars could be larger than
The atomic structures and processes in strong magnetic field have been studied theoretically by various methods, such as finite element[
Recently, extremely strong magnetic field can be generated using high-power laser in laboratory. Those magnetic fields can be up to thousand Tesla[
4 Studying shock wave generation in magnetized counter-streaming plasmas
Energetic particles are ubiquitous in astrophysical plasmas. However, the physical acceleration process is not well understood. The most remarkable example is the solar energetic particles[
The scaled-down and controllable laboratory experiments, as an accessory to the astronomical observations, can closely study the collisionless shock wave using high-power lasers. Counter-streaming plasmas system is a test bed for studying such phenomena in laboratory[
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